seminario viperplus - stmicroelectronics
TRANSCRIPT
ST Off-Line Power Supply
September 2011
Agenda
ST brief Introduction
Offline Common configurations
SMPS Fundamentals
SMPS Common Configurations
New VIPer+ Family
Roadmap
Products
Detailed description
New products
Magnetic Components
Lunch
Layout Recommendations
Design Tools
2
ST brief introduction
4
50/50 JV with Ericsson
* Source: iSuppli-2008 rankings, ST and ST-Ericsson
Wireless:
#2
Consumer:
#2 in Set Top Box
Computer:
#2 (HDD & Printers)
Automotive:
#3
Industrial:
#1
Products
Market Position*
Major Customers
Automotive, Consumer,
Computer and
Communication
Infrastructure (“ACCI”)
Industrial and
Multisegment Sector
(“IMS”)
Wireless
Home
Entertainment
& Displays
Computer &
Communication
Infrastructure
Automotive
Products
Group
Analog,
Power and
MEMS
Microcontrollers,
Memories and
SmartcardsMajor Product Lines
Market Segments
30 %
31 %
38%
5
Source: iSuppli, March 11th 2011
(x) * refers to M&A. Details provided on separate page.
2009Rank
2010Rank
Company Name2009
Revenue($)2010
Revenue($)
RevenuePercentChange
RevenuePercentof Total
RevenueCumulative
Percent
1 1 Intel 32,187 40,394 25.5% 13.3% 13.3%
2 2 Samsung Electronics 17,496 27,834 59.1% 9.2% 22.4%
3 3 Toshiba 10,319 13,010 26.1% 4.3% 26.7%
4 4 Texas Instruments (1) 9,671* 12,994 34.4% 4.3% 31.0%
95
Renesas Electronics (2) 5,15311,893* 130.8% 3.9% 34.9%
12 NEC Electronics 4,384
7 6 Hynix 6,246 10,380 66.2% 3.4% 38.3%
5 7 STMicroelectronics 8,510 10,346 21.6% 3.4% 41.7%
13 8 Micron Technology (3) 4,293* 8,876* 106.8% 2.9% 44.6%
6 9 Qualcomm 6,409 7,204 12.4% 2.4% 47.0%
14 10 Broadcom (4) 4,278 6,682* 56.2% 2.2% 49.2%
15 11 Elpida Memory 3,948 6,446 63.3% 2.1% 51.3%
8 12 AMD 5,207 6,345 21.9% 2.1% 53.4%
11 13 Infineon Technologies (5) 4,456* 6,319 41.8% 2.1% 55.5%
10 14 Sony (6) 4,468* 5,224 16.9% 1.7% 57.2%
18 15 Panasonic Corporation (7) 3,243* 4,946 52.5% 1.6% 58.8%
17 16 Freescale Semiconductor (8) 3,402* 4,357 28.1% 1.4% 60.3%
19 17 NXP (9) 3,240 4,028* 24.3% 1.3% 61.6%
23 18 Marvell Technology Group 2,572 3,633 41.3% 1.2% 62.8%
16 19 MediaTek 3,551 3,553 0.1% 1.2% 64.0%
20 20 nVidia 2,826 3,196 13.1% 1.1% 65.0%
Top 20 Companies 141,475 197,660 39.7% 65.0%
All Others 88,719 106,415 19.9% 35.0%
Total Semiconductor 230,194 304,075 32.1% 100.0%
2010 overall ranking
2010 ranking on ST SAM
2009Rank
2010Rank Company Name
2009Revenue
($)
2010Revenue
($)
RevenuePercentChange
RevenuePercentof Total
RevenueCumulative
Percent
1 1 Texas Instruments 9,671 12,994 34.4% 7.3% 7.3%
52
Renesas Electronics 5,14611,469 122.9% 6.4% 13.8%
9 NEC Electronics 4,119
2 3 STMicroelectronics 8,093 9,778 20.8% 5.5% 19.3%
4 4 Intel 5,721 7,233 26.4% 4.1% 23.3%
3 5 Qualcomm 6,409 7,204 12.4% 4.1% 27.4%
8 6 Broadcom 4,278 6,682 56.2% 3.8% 31.1%
7 7 Infineon Technologies 4,456 6,319 41.8% 3.6% 34.7%
6 8 Toshiba 5,053 5,659 12.0% 3.2% 37.9%
11 9 Samsung Electronics 3,279 4,348 32.6% 2.4% 40.3%
12 10 NXP 3,235 4,024 24.4% 2.3% 42.6%
18 11 Panasonic Corporation 2,428 3,647 50.2% 2.1% 44.6%
10 12 MediaTek 3,551 3,553 0.1% 2.0% 46.6%
17 13 Marvell Technology Group 2,458 3,472 41.3% 2.0% 48.6%
15 14 Freescale Semiconductor 2,537 3,204 26.3% 1.8% 50.4%
13 15 nVidia 2,826 3,196 13.1% 1.8% 52.2%
16 16 Fujitsu Semiconductor Limited 2,537 3,059 20.6% 1.7% 53.9%
14 17 Sony 2,810 2,999 6.7% 1.7% 55.6%
20 18 Analog Devices 2,091 2,862 36.9% 1.6% 57.2%
19 19 ROHM Semiconductor 2,286 2,776 21.4% 1.6% 58.7%
23 20 Maxim Integrated Products 1,657 2,367 42.8% 1.3% 60.1%
Top 20 Companies 80,522 106,845 32.7% 60.1%
All Others 59,587 70,997 19.1% 39.9%
Total Semiconductor 140,109 177,842 26.9% 100.0%
6
Source: iSuppli, March 11th 2011SAM = TAM – DRAM – Flash – MPU - Opto
Morocco
Malaysia
Manufacturing Locations
Philippines
Front-end fabs
Back-end fabs
China
(Shenzhen, Longgang)
Malta
Italy
(Agrate, Catania 6”& 8”)France
(Crolles I & II, Rousset, Tours)
Singapore 2009 sales : US$ 8.51 billion
2010 sales : US$ 10.346 billion
Approx. 53,000 employees in the group
15 main production sites
Advanced R&D centers in 10 countries
8
Innovation Investment
SMPS Fundamentals
9
Power Supply in Appliances
Power ranges from 3W to 15W
Non-isolated topologies are used where there
are no external electrical connection.
Isolated topologies are used where there is a
possibility of user touching electrical points.
Cost and simplicity are key drivers.
10
BUCK
11
Topology
12
++
IL
L1V2
V1
S1
S2
Topology Applied
13
L
Cout
VS
IIN
IGND
IIND
Buck topology – ON time
14
L
IIND
IM
ID
IL
Vsw
On
Buck topology – Off time
15
IM
ID
IL
Vsw
Off
L
IIND
Current/Voltage Waveforms
16
++
IL
L1V2
V1
S1
S2
IS1
IS2
IL
Vsw
Buck Example
17
Buck/Boost, Negative Output
18
IL
VD
ISWID
VIN
VOUT
RO
Negative Output Example
19
Continuous versus Discontinuous
Continuous refers to continuous current in the
inductor, there is always positive current flowing
in the inductor.
20
Inductor current
Load Current
Continuous versus Discontinuous
Discontinuous refers to the inductor current
going to zero during every clock cycle.
21
Inductor current
Load Current
Continuous versus Discontinuous
Discontinuous mode has higher peak currents.
Higher peak current lowers the efficiency.
Higher peak current increases the EMI energy.
22
EMI considerations for the Buck
EMI stands for ElectroMagnetic Interference and
is the result of noise generated by switching
devices.
EMI has two components, radiated and
conducted.
Radiated refers to the EMI that is “broadcast” into
the air by the module.
Conducted refers to EMI on the power line
emitted by the module.
23
EMI Considerations for the Buck
The buck has one switching point, the common
point of the two switches and the inductor.
A simple RC snubber at this switching point is
the most common method of reducing EMI (both
conducted and radiated).
24
Reduction of EMI
25
L
Cout
Snubber
VS
IIN
IGND
IIND
Effect of Snubber on VS(t)
26
No snubber
With Snubber
VS
T (ns)
Ringing causes big EMI numbers
Snubber lows frequency
and amplitude of ringing
50 100 150
FLYBACK
27
Topology
28
Topology Applied
29
VP VS
+ +
IP IS
Note: NP = # of primary turns
NS = # of secondary turns
VD
VIN
Transformer relationship
30
N12
N22
L1
L2
Where NX = number of turns
LX = inductance of winding
I1 I2
+
V1V1
+
N1 N2
N1
N2
V1
V2
V1
V2
I2
I1
Flyback topology – ON time
IQ1
VQ1
ID1
ON OFF ON OFF
C1
D1
C2
Q1
1 4
2 3
T1
Input DCOutput DC
+ +
-
-
+
+-
-
IQ1
SWPKQPT fILP 2
112
1
C1
D1
C2
Q1
1 4
2 3
T1
Flyback topology – OFF time
Input DCOutput DC
+ +
-
-
IQ1
VQ1
ID1
ON OFF ON OFF
+
+-
-
ID1
Charge and discharge of the core
33
I
t
VIN
LP V
OUT
LS
Drain Switching Waveforms (DM)
34
Drain Switching Waveforms (CM)
35
Diode Switching Waveforms
36
Current/Voltage Waveforms (discontinuous)
37
VD
VIN
IP
IS
VP
VS
VIN+VO*NP/NS
VIN
-VO*NP/NS
VOUT
VIN * NS/NP
T
t
IPEAK
Current/Voltage Waveforms (continuous)
38
VD
VIN
IP
IS
VP
VS
VIN+VO*NP/NS
VIN
-VO*NP/NS
VOUT
VIN * NS/NP
IPEAK
Quasi Resonant
39
VD
VIN
IP
IS
VP
VS
VIN+VO*NP/NS
VIN
-VO*NP/NS
VOUT
VIN * NS/NP
T
t
IPEAK
VD
VIN
IP
IS
VP
VS
VIN+VO*NP/NS
VIN
-VO*NP/NS
VOUT
VIN * NS/NP
T
t
IPEAK
Key difference between a
discontinuous mode flyback and
QR flyback:
1) There is no dead time in QR
flyback.
2) QR flyback is a variable frequency
scheme
EMI considerations for a Flyback
There are two commutation point in a flyback
The primary side power switch.
The secondary side diode switch
EMI is created only if there is a high frequency
power dissipation event.
For DM, the current is ~zero when the switch
turns on and the diode turns off.
Most of the EMI is generated when the switch
turns off and the diode turns on (the current is
highest).
40
Reducing EMI
High current tracks should be as short as possible
Area enclosed by high current loops, as indicated in red
should be minimized
It is recommended to place high current tracks close
each to other to compensate magnetic field and reduce
parasitic inductance
Use snubber to decrease dV/dt. Snubbers should be
placed with minimum trace lengths
Increase capacitance between primary and secondary
side of the transformer. Higher Leakage inductance
helps!!
Connect the VIPer Drain to the deepest primary winding
41
Reducing EMI
42
VP VS
+ +
VIN
Auxiliary Supply
43
VIN = 160VVOUT = < 40V
VAUX = 12V
Why Auxiliary Supply (1/2)
The PWM control loop uses 10V/5mA for power.
If the power supply is the input bus (rectified line
voltage) and VDD is ~10V then the PWM loop
will draw (160V-10V)*5mA=7.5W
The secondary output can’t be used because
galvanic isolation is required
Auxiliary supply allows low power consumption
and galvanic isolation.
Cost is low.
44
Why Auxiliary Supply (1/2)
Transformer action will also apply between the
secondary voltage and the auxiliary voltage.
Fault tolerence when reference/opto fails: No
overvoltage seen at output.
Short circuit behavior: with aux winding the max
output power is limited, no need to oversize
secondary side components.
45
Flyback Example
46
Buck Vs Flyback
Buck
Lower cost
Less components
Designed based on
output current
Differential EMI critical
Outputs must be
inaccessible to users
Single output commonly
Flyback
Higher cost
Custom transformer
Designed based on
output power
Common mode EMI
critical
Users can touch output
connectors or output
power stages
Multiple outputs possible
47
Viper Family
48
49
Solutions for low-medium power SMPS
The best energy saving approach Minimized stand-by power
High efficiency
The most reliable approach Avalanche rugged power section
Integration of advanced protections
Thermal shutdown sensor located on power section
The most flexible approach Modular product: controller + power section
Packages’ design and development
The most profitable partner Continuous products’ innovation
Technical support (competence centers, documentations, software)
Excellence in quality and supply chain
50
Secondary Controllers
HV Converters
VIPer Plus.
Primary Controllers
DELIVER the
power to
Transformer’s
Primary
Sync.
Rectification
RECTIFY Efficiently
(optional)
Replacement of the
diode
CC/CV
REGULATE
Constant Voltage &
Current
(Adapters,
Chargers,..)
DCAC
Controller + MOSFET
Solutions for low-medium power SMPS
New VIPer Plus family
51
GND / SOURCE DRAIN
FB
DRAIN
CONT / Lim
VDD
Function
+ Technology
+ Functionalities
+ Protections
= VIPer+
VIPer+
+ Technology
52
BCD6 controller technologyNEW
NEW
GND / SOURCE DRAIN
FB
DRAIN
CONT
VDD
BR
VIPER17CONT
VDD
FB
Out
CONTROL
On-Off
Gate
Sense
Tmp1
Gnd
SOURCE
Out
GndGnd1
Sense
Gate
On/Off
Tmp1
DRAIN
BR
800V Power MOSFET
+ Functionalities
Current mode converter with ADJUSTABLE IDLIM set point
Frequency
Fixed (60kHz or 115kHz) with JITTERING for EMI reduction
Quasi Resonant operation with Frequency Fold-back function (x5)
SOFT START UP: IDLIM increased cycle by cycle
BURST MODE in low load condition with IDLIM fixed
ADJUSTABLE IDLIM set point
STAND BY consumption < 50 mW
53
+ Protections
Over voltage protection (OVP)
2nd over current protection (2nd OCP)
Over load protection (OLP)
Over temperature protection + hysteresis (OTP)
Brown out protection
Max Duty Cycle: 70%
54
AUTO RESTART
MODE
after every fault
condition
55
VIPer37
VIPer25
VIPer17 VIPer27
VIPer35VIPer15
VIPer28 VIPer38
VIPer16 VIPer26VIPer06
SMPS topology and main applications
High features - Isolated Fly-backAuxiliary PS, STB, DVD, Games console, LCD TV,
major appliances, Motor control, Power Meter,
Chargers, Adapters, PC Stand-by
Quasi Resonant - Isolated Fly-backAuxiliary PS, STB, DVD, Games console, LCD TV,
major appliances, Motor control, Power Meter,
Chargers, Adapters, PC Stand-by
Peak Power Isolated Fly-backDVD, Printer, ATX
Basic features – Isolated Fly-backAuxiliary PS, STB, DVD, Games console, LCD TV,
major appliances, Motor control, Power Meter,
Chargers, Adapters, PC Stand-by
Non Isolated convertersHome appliances, Small appliances, Lighting, Power
meter
DIP7
SO16N
DIP7
SO16N
DIP7
SSO10SDIP10
1W……. …….15W(1) / 30W(2)
56
Brown out
Over Load Delay
PWM operations with settable IDLIM
Over Voltage
Over
Temperature
shut down
No auxiliary
Quasi ResonantFixed Frequency (60 or 115kHz) with
Jittering
Simplified
Non Isolated
loop
2° OCP
Feedback
disconnection
Extra Power
Timer
Burst Mode
Soft start
VIPer x7 VIPer x8
Brown out
VIPer x5 VIPer x6Basic features
Auto restart
Auto restart
(fixed time)
Main features
800VAvalanche Rugged
Fixed Frequency(301 or 60 or 115kHz)
with Jittering
Latched a
Feedback
disconnection(option only for VIPer06)
Latched OVP(option for VIPer25LLD)
(1) 30kHz available only for VIPer06
57
VIPer37
VIPer25
VIPer17 VIPer27
VIPer15
VIPer28
VIPer16 VIPer26VIPer06
24 7 30 3 1
HV Converter Portfolio + Roadmap
VIPer50VIPer22
VIPer20VIPer12 VIPer100 VIPer53
800 V
Av.Rug.
18 30 5.5 3 1 730V
620V
1 W (3)
6W(1) / 12W(2) 12W(1) / 24W(2)4W(1) / 8W(2) 15W(1) / 30W(2) 20W(1) / 35W(2) 30W(1) / 50W(2)
CTRL
VIPer x7
CTRL
VIPer x8
CTRL
VIPer x5
CTRL
VIPer x6
(1) Open frame, VIN = 85 - 264VAC ,
(2) Open frame, VIN = 230VAC ±20%,
(3) Achievable consumption at no load with Vin 264VAC
4.5
SSO10 & DIP7 SO16N & DIP7 SO16N & DIP7 SDIP10
under development, SOP planned within 2011
30 mW(3)
30 mW(3)
30 mW(3)
30 mW(3)
Tools availability
DatasheetTraining
(slides)
Application
Notes
Evaluation
Boards
e-Design
StudioSpreadsheet Spice Model
VIPer17 Yes Yes Yes Yes Yes Yes Yes
VIPer27 Yes Yes Yes Yes Yes Yes Yes
VIPer37 Preliminary YesUnder
development
Under
development
Under
development
Under
development--
VIPer06 Preliminary YesUnder
development
Under
development
Under
development
Under
development--
VIPer16 Yes Yes Yes Yes Yes Yes Yes
VIPer26 Yes Yes Yes Yes Yes Yes --
VIPer15 Yes Yes Yes YesUnder
development
Under
development--
VIPer25 Yes Yes Yes YesUnder
developmentYes --
VIPer28 Yes Yes Yes Yes YesUnder
development
--
.
58
Evaluation Boards and ANs
59
VIPer 17 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER17LN STEVAL-ISA058V1Isolated
Fly-back85-265 5W 5V / 1A AN2864 Stand-by PSU
VIPER17HN STEVAL-ISA060V1Isolated
Fly-back85-265 6W 12V / 0.5A AN2753 Stand-by PSU
VIPER17HN EVLVIP17-5WCHGIsolated
Fly-back90-265 5W 5V / 1A AN2840
Cell Phone
Battery Charger
VIPER17HN STEVAL-ILL017V1Isolated
Fly-back220 ±20% 3.5W 7V / 500mA AN2811 Led Driver
VIPER17HN STEVAL-ISA062V1Isolated
Fly-back85-265 5.5W
5V / 500mA
12V / 250mAAN2934 General Purpose
VIPER17HN EVLVIP27-7WLEDIsolated
Fly-back100-264 3.5W 10V / 350mA AN3212
High Power
Factor Led Driver
VIPer 27 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER27LN EVLVIP27L-12WSIsolated
Fly-back85-265 12W 5V / 2.4A AN2929 Auxiliary PSU
VIPER27HN EVLVIP27H-12SBIsolated
Fly-back85-265 11W 5V / 2.2A AN3011 Auxiliary PSU
VIPER27HN EVLVIP27-7WLEDIsolated
Fly-back100-264 7W 10V / 750mA AN3212
High Power
Factor Led Driver
VIPer 37 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER37xx TBDIsolated
Fly-back85-265 5V / 3A
VIPER37xx TBDIsolated
Fly-back85-265 12V / 1.3A
Evaluation Boards and ANs
60
VIPer 06 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER06LS
VIPER06HSUnder development
Non isolated
Fly-back85-265
12V / 300mA
option
( 5V /800mA)
TBD Home appliance
Under developmentIsolated
Fly-back85-265 TBD TBD Home Appliance
VIPer 16 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER16LN STEVAL-ISA010V1Non isolated
buck converter85-500 1.8W
12V / 5V (post
reg.) / 150mAAN2872 Power Meter
VIPER16LN EVLVIP16L-4WFNNon Isolated
Fly-back85-265 4.5W 16V / 280mA
AN3028
draftHome appliance
VIPER16LN STEVAL-ISA071V1Non Isolated
Fly-back85-265 4W
- 5V / 400mA,
+7V / 160mAUM0920 Home appliance
VIPER16LN EVLVIP16L-5WFLIsolated
Fly-back85-265 5W 12 / 350mA databrief
Home appliance
Auxilairy PSU
VIPER16LD EVLVIP16LD-1W5 Non Isolated
buck converter85-265 1.8W
12V / 5V (post
reg.) / 150mAdatabrief
Small Home
Appliance
VIPER16HN EVLVIP16H-4WFNNon Isolated
Fly-back85-265 4.5W 16V / 280mA databrief Home appliance
VIPer 26 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER26LD STEVAL-ISA081V1Primary
Regulation
Fly-back
85-265 12.5W 12V, 3.3V / 1A UM0984 Home appliance
Evaluation Boards and ANs
61
VIPer 15 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER15LN STEVALVIP15L-6W
Quasi-
Resonant
Isolated
Fly-back
90-265 VAC 6W 12V, 500mAAN3160
draftAuxiliary PSU
VIPER15LN EVLVIP15L-5WSB
Quasi-
Resonant
Isolated
Fly-back
90-265 VAC 5W 5V, 1A TBD Auxiliary PSU
VIPer 25 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER25LN EVLVIP25L-10WSB
Quasi-
Resonant
Isolated
Fly-back
85-265 VAC 10W 5V, 2AAN3286
draft
Auxiliary PSU
STB
Power Meter
VIPer 28 Order code Topology Input VAC Output Output Relevant AN Reference
VIPER28LN EVLVIPER28L-10WIsolated
Fly-back85-265 VAC 12W 5V, 2.4A AN2950
Auxiliary PSU
Printer
62
VIPer06 / 16 /26
800V, avalanche rugged power MOSFET
PWM controller with drain current limit IDlim
Adjustable current limit,IDlim
Fixed frequency with Jittering
high performance for stand-by & efficiency
No need of auxiliary winding
Automatic auto restart after faults
Hysteretic thermal shutdown
Direct feedback for non isolated SMPS
Replacement of capacitive power supply
Open loop protection
Main Features
Main parametersMAIN PARAMETERS
Power MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 800
RDSon [Ohm] 30 /24 / 7
VDD [V] 9 ÷ 23
FOSC [KHz] 30 or 60 or 115
Max IDlim [mA] 420 / 740
RTHJ-A [°C/W] (1) 80
POUT [W]@ 85-265 VAC 4 / 6 / 12
(1) Package SO16N, 100mm2 of Cu
(2) Open Frame
GND
controller ground / power MOSFET Source
VDD
controller supply voltage / ICHARGE output current
LIM
Current limit set-up, IDlim .
FB
direct voltage feedback (in case of non isolated SMPS)
COMP
Compensation network.
Current loop feedback in case of isolated SMPS
N.A.
Not Available for user. (It can be connected to GND)
N.C.
Not Connected
Pin description
63
C6
R4
R2
+C1
C3 C4
R3
+
C5
D3L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
+C2
R1
Controller
T1
GND
VOUT
+
-
Schematics with VIPerx6
FLY-BACK / Fixed Freq.
NON ISOLATED
Simplified feedback loopR3, R4
No Need auxiliary windingC4
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Default current limit400mA / 700mA
Short circuit protection
(automatic restart)
VIPer06 / 16 / 26
Schematics with VIPerx6
64
C6
R4
R2
+C1
C3 C4
R3
+
C5
D3L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
+C2
R1
Controller
T1
GND
VOUT
+
-
FLY-BACK / FF
NON ISOLATED
Simplified feedback loopR3, R4
No Need auxiliary windingC4
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Current limit set-up - RLIM
<400mA or <700mA
Short circuit protection
(automatic restart)RLIM
VIPer06 / 16 / 26
Schematics with VIPerx6
65
Stand-by optimization , 30 mWD4, R5
VOUT ≥ 12 V
FLY-BACK / FF
NON ISOLATED
Simplified feedback loopR3, R4
No Need auxiliary windingC4
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Default current limit400mA / 700mA
Short circuit protection
(automatic restart)
C6
R4
R2
+C1
C3 C4
R3
+
C5
D3L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
+C2
R1
Controller
T1
GND
VOUT
+
-
D4
R5
VIPer06 / 16 / 26
Feedback disconnection
(automatic restart)
Schematics with VIPerx6
C6
R4
R2
+C1
C3 C4
R3
+
C5
D3
L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
GND
+C2
R1
AC INVOUT
Controller
T1
D4
R5
+
-
VOUT < 12 V
FLY-BACK / FF
NON ISOLATED
Simplified feedback loopR3, R4
Need auxiliary windingC4 + AUX
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Default current limit400mA / 700mA
Short circuit protection
(automatic restart)
VIPer06 / 16 / 26
Stand-by optimization , 30 mWD4, R5
Feedback disconnection
(automatic restart)
Schematics with VIPerx6
C6
R4
R2
+C1
C3 C4
R3
+
C5
D3
L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
GND
+C2
R1
AC INVOUT
Controller
T1
D4R5
+
-
Feedback disconnection
(automatic restart)
No need the optocoupler
FLY-BACK / FF
PRIMARY REGULATION
Simplified feedback loopR3, R4
Need auxiliary windingC4 + AUX
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Default current limit400mA / 700mA
Short circuit protection
(automatic restart)
VIPer06 / 16 / 26
Stand-by optimization , 30 mWD4, R5
Schematics with VIPerx6
68
VIPer06 / 16 / 26
IC3
R4
R4
IC2
C7
R3
C6R2
+C1
C3
C4
+
C5
D3
L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
GND
+C2
R1
AC INVOUT
Controller
T1
D4R6
+
-
R5
C6
FLY-BACK / FF
ISOLATED
Minimum components count
No Need auxiliary windingC4
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Default current limit400mA / 700mA
Short circuit protection
(automatic restart)
Schematics with VIPerx6
69
IC3
R4
R4
IC2
C7
R3
C6R2
+C1
C3
C4
+
C5
D3
L1
FB
DRAIN
GND VDDCOMP LIM
VIPER x6
D2
D1
GND
+C2
R1
AC INVOUT
Controller
T1
D4R6
+
-
R5
C6
Feedback disconnection
(automatic restart)
FLY-BACK / FF
ISOLATED
Minimum components count
Need auxiliary windingC4 + AUX
Low cost EMI filterC1, C2, L1
Low cost clamp componentsR2,D2,C6
Default current limit400mA / 700mA
Short circuit protection
(automatic restart)
VIPer06 / 16 / 26
Stand-by optimization , 30 mWAUX + D4, R5
70
VIPer17 / 27 / 37
Main Features
Main parametersMAIN PARAMETERSPower MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 800
RDSon [Ohm] 24 / 7 / 4.5
VDD [V] 9 ÷ 23
FOSC [KHz] 60 or 115
Max IDlim [mA] 420 / 740 / 1050
RTHJ-A [°C/W] (1) 50
POUT [W] @ 85-265VAC 6 / 12 / 15
(1) Package SO16N and 100mm2 of Cu
(2) Open Frame
800V, avalanche rugged power MOSFET
PWM controller with drain current limit, IDlim.
Adjustable current limit, IDlim
Fixed Frequency with Jittering
High performance for stand-by & efficiency
Integrated protections: OVP, OLP, high OCP
Automatic auto restart after fault
Hysteretic thermal shutdown
Brown-out: minimum input voltage is settable
Pin description
* BR pin has the position 10 for VIPER17LD/HD (SO16N package)
*
GND
controller ground / power MOSFET Source
VDD
controller supply voltage / ICHARGE output current
CONT
OVP set-up, IDLIM set-up.
FB
current loop feedback
BR
brown out set-up
N.A.
Not Available for user. (It can be connected to GND)
N.C.
Not Connected
*
Schematics with VIPerx7
71
30mW Stand-by
FLY-BACK / FF
ISOLATED
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Default current limit400mA / 700mA / 1000mA
VIPer17 / 27 / 37
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBBR CONT
VIPER x7
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
+C1
L1
+C2AC IN
F
NTC
Schematics with VIPerx7
72
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Current limit set-up - RLIM
<400mA or <700mA or <1000mA
30mW Stand-by
RLIM
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBBR CONT
VIPER x7
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
+C1
L1
+C2AC IN
F
NTC
FLY-BACK / FF
ISOLATEDVIPer17 / 27 / 37
Schematics with VIPerx7
73
Over Voltage Protection (VOUT)RLIM , ROVP , DOVP
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Current limit set-up - RLIM
<400mA or <700mA or <1000mA
30mW Stand-by
RLIM
ROVP
DOVP
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBBR CONT
VIPER x7
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
+C1
L1
+C2AC IN
F
NTC
FLY-BACK / FF
ISOLATEDVIPer17 / 27 / 37
Schematics with VIPerx7
74
Brown out set-up (VINDC)R7,R8, C6
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Default current limit400mA / 700mA / 1000mA
30mW Stand-by
C6
R8
R7
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBBR CONT
VIPER x7
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
+C1
L1
+C2AC IN
F
NTC
FLY-BACK / FF
ISOLATEDVIPer17 / 27 / 37
Schematics with VIPerx7
75
Over Voltage Protection (VOUT)RLIM , ROVP , DOVP
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Current limit set-up - RLIM
<400mA or <700mA or <1000mA
Brown out set-up (VINDC)R7,R8, C6
30mW Stand-by
RLIM
ROVP
DOVP
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBBR CONT
VIPER x7
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
+C1
L1
+C2AC IN
F
R7
R8
C6
NTC
FLY-BACK / FF
ISOLATEDVIPer17 / 27 / 37
76
VIPer28
Main Features
Main parametersMAIN PARAMETERSPower MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 800
RDSon [Ohm] 7
VDD [V] 9 ÷ 23
FOSC [KHz] 60 or 115
Max IDlim [mA] 850
RTHJ-A [°C/W] (1) 50
POUT [W] @ 85-265VAC 12
(1) Package SO16N and 100mm2 of Cu
(2) Open Frame
GND
controller ground / power MOSFET Source
VDD
controller supply voltage / ICHARGE output current
COMP
OVP set-up, IDLIM set-up.
FB
current loop feedback
EPT
Extra Power Time set-up
N.A.
Not Available for user. (It can be connected to GND)
N.C.
Not Connected
800V, avalanche rugged power MOSFET
PWM controller with drain current limit, IDlim.
Adjustable current limit, IDlim
Fixed Frequency with Jittering
High performance for stand-by & efficiency
Integrated protections: OVP, OLP, high OCP
Automatic auto restart after fault
Hysteretic thermal shutdown
Extra Power Management
Pin description
Schematics with VIPerx8
77
Extra Power TimerCEPT
FLY-BACK / FF
ISOLATED
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Default current limit400mA / 700mA / 1000mA
30mW Stand-by
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBEPT CONT
VIPER x8
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
+C1
L1
+C2AC IN
F
CEPT
NTC
VIPer28
78
VIPer15 / 25
Main Features Pin description
Main parametersMAIN PARAMETERS
Power MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 800
RDSon [Ohm] 24 / 7
VDD [V] 9 ÷ 23
FOSClim [KHz]up to 150 (L type)
up to 225 (H type)
Max IDlim [mA] 420 / 740
RTHJ-A [°C/W] (1) 80
POUT [W] @ 85-26 VAC 6 / 12
(1) Package SO16N, 100mm2 of Cu
(2) Open Frame
800V, avalanche rugged power MOSFET
Quasi-Resonant PWM controller with drain current limit, IDlim.
Adjustable current limit, IDlim
Feed-Forward compensation
High performance for stand-by & efficiency
Integrated protections: OVP, OLP, high OCP
Automatic auto restart after fault
Hysteretic thermal shutdown
Brown-out: minimum input voltage is settable
GND
controller ground / power MOSFET Source
VDD
controller supply voltage / ICHARGE output current
ZCD
Zero Current Detection, Feed-Forward set-up, OVP set-up, IDlim set point.
FB
Current loop feedback
BR
Brown out set-up
N.A.
Not Available for user. (It can be connected to GND)
N.C.
Not Connected
Schematics with VIPer x5
79
Feed-ForwardRFF
Over Voltage Protection (VOUT)RLIM , ROVP , DOVP
FLY-BACK / Quasi Res.
ISOLATED
Minimum components count
Low cost EMI filterC1,C2, L1
Low cost clamp componentsR2,C6,D2
Short circuit protection No need ext components
2nd Over Current protectionNo need ext components
Current limit set-up - RLIM
≤400mA or ≤700mA or ≤1000mA
Zero current Detection (QR)RLIM , ROVP , DOVP, RFF
30mW Stand-by
IC3
R4
R4
IC2
C7
R3
C6R2
C3
C4
+
C5
D3
VDD
DRAIN
GND FBBR ZCD
VIPER x5
D2
GND
VOUT
Controller
T1
D4R6
R5
C6
RLIM
DOVP
ROVPRFF
+C1
L1
+C2AC IN
F
NTC
VIPer15 / 25
VIPER+ DETAILLE
80
2 Dies
Give flexibility to get the best technology for each
section
Power MOSFET in SuperMESH Technology
BCD6 controller technology
81
CONT
VDD
FB
Out
CONTROL
On-Off
Gate
Sense
Tmp1
Gnd
SOURCE
Out
GndGnd1
Sense
Gate
On/Off
Tmp1
DRAIN
BR/EPT
Power SECTION: 800V BVDSS
Leakage inductance contributes to the power
dissipation
82
PL=1/2LL(Ipk)2fSWVclamp/(Vclamp-Vfl)
Vindc
VDS
Vclamp
Vfl
tOff time On time
800V
High Vclamp reduces power loss
VDD pin (IC supply)
83
GND / SOURCE DRAIN
FB
DRAIN
CONT+~/ ZCD* / LIM^
VDD
VIPerx5*
Viper16^
VIPerx7+
VIPerx8~ BR*+ / EPT
~/ COMP^
VDD pin: What you can do?
To manage the power supply start-up
HV start up current generator & soft start
To keep alive the VIPer’s supply
wide range voltage
Viperx5, x7 & x8 (from 8.5V to 23V)
Viperx6 (from 11.5V to 23V)
To manage the power supply auto-restart
with special low restart current from the HV start up current
generator
To manage the Power supply turn-off
when VDD<8.5V and VDRAIN<80V, Viperx5, x7 & x8
when VDD<11.5V and VDRAIN<50V, Viperx6
84
GND / SOURCE DRAIN
FB
DRAIN
CONT
VDD
BR
Aux
winding
IDS_
CH
HV start up
VDD pin: IC turn-on & turn-off
VDD_ON
Fsw = 60 KHz
VDD(max
)
VDD_OF
F
VDD(restart)
Fsw = 0 KHz Fsw = 0 KHz
VDRAIN _START= 80V
VIN
VDD SOFT
START
VDD pin: IC auto-restart with fault
LOW controller consumptions LOW restart repetition rate
VDD_ON
Fsw = 0 KHz Fsw =
60 KHz
VDD(max
)
VDD_OF
F
VDD(restart)
Fsw = 0 KHz
IDS_CH =0.6 mA
Fsw =
60 KHzFsw
IDD_FAULT = 300 uA
IDD_OFF = 250 uA
VIN
SOFT START UP
Advantages :
Reduce the stress on the transformer
Improving of the VIPer and system and reliability
Soft start zone with
growing IDLIM valueSteady stateTransient
zone
t
t
IDLIM
8.5 ms
IDRAIN
VFBVFB_olp
VFB_lin
FB pin (Viperx5, x7 & x8 )
88
GND / SOURCE DRAIN
FB
DRAIN
CONT+~/ ZCD*
VDD
VIPerx5*
VIPerx7+
VIPerx8~
BR*+ / EPT~
FB pin: What you can do?
To make the current mode control loop
Error Amplifier Input
To fix the loop stability
Only in Viperx5, x7 & x8
To manage the Over Load Protection
Only in Viperx5, x7 & x8
To enter the Burst Mode
Only in Viperx5, x7 & x8
89
FB pin: IDRAIN versus VFB
90
IDLIM
IDRAIN
VFB
OVER LOADCURRENT MODE CONTROLBURST MODE
ID_BM
VFB_bm
drain current is
depending from
the load
OLPShut down
VFB_bm- VFB_bm_hysVFB_lin VFB_olp
FB pin: Current mode & loop stability
Linear range: VFB from VFB_bm +VFB_bm_hys to VFB_lin
CFB or CFB , RFB , CFB1 fixes the loop stability
91
CFB
FBR1
R2
Sense FET
+
-
PWM logicIFB
The optocoupler current and the
IFB current are depending from
the output load
The drain current is compared
with IFB in order to drive the PWM
CFB
CFB1RFB
FB pin: Over load protection
VFB ≥ VFB_lin , V max load has been reached and the FB voltage is
controlled
VFB = VFB_lin, 3uA current starts charging CFB
VFB = VFB_olp, Power section is switched off for over load after the
OLP delay
92
CFB
GND / SOURCE DRAIN
CONT
DRAIN
FB
VDD
BR
VIPERx5
VIPERx7
VIPERx83 A
VFB
VDSt
OLP delay
= A
VVC
linFBolpFB
FB3
__
VFB_olp
VFB_lin
FB pin: OLP delay, why?
IMMUNITY to over load NOISE during the normal operation
IMMUNITY to false OLP and incorrect switch off before the
converter’s steady state conditions
93
FB pin: Burst Mode working mode
94
VFB
IDS
t
t
ID_BM
Converter frequency reduction by packets operation
STAND-BY mode: less than 30 mW with optimezed psu design
VFB_bm- VFB_bm_hys
FB & COMP pin (Viperx6)
95
GND / SOURCE DRAIN
FB
DRAIN
LIM^
VDD
Viper16^
COMP^
FB & COMP (only for non isolated topology)
Fly-back non isolated
Buck
Buck-Boost
FB pin = EA input
COMP pin = EA output
FB pin takes the feedback directly from VOUT
FB voltage is compared with the EA reference
Loop is compensated by RCC to COMP pin
PWM is performed comparing the EA output (COMP) with sense FET.
96
FB & COMP (only for isolated smps)
Fly-back isolated with optocoupler
FB pin = GND => EA disabled
COMP pin takes the feedback from optocoupler
Loop is compensated by RCC to COMP pin
PWM is performed comparing the COMP signal with sense FET.
PWM dynamic VCOMPL – VCOMPH
V(COMP) < VCOMPL – 50mV => Burst Mode
V(COMP) > VCOMPH => Current Limited to IDlim
97
FB & COM: Burst Mode working mode
STAND-BY mode: less than 50 mW with optimezed psu
design
Activated when COMP voltage decreases
Low load
98
FB & COMP: Open loop failure protection
(with aux winding)
NON-ISOLATED If RUP is opened:
V(OUT) increases and then V(VDD) increases (coupled by aux winding)
I(DRAIN) = Idlim
VDD pin has inside a clamp:
If V(VDD) reaches the VDDclamp level and the injected current, IDD, exceeds the latch
threshold, IDDol, a fault signal is generated*
If RDOWN is opened:
V(OUT) is clamped to VREF_FB (3.3V typ)
99
ISOLATED If RUP is opened:
V(OUT) increases and then V(VDD) increases (coupled by aux winding)
I(DRAIN) = IDlim
VDD pin has inside a clamp: If V(VDD) reaches the VDDclamp level and the injected current, IDD, exceeds the latch threshold, IDDol, a fault signal is
generated*
If RDOWN is opened: V(OUT) is clamped to the voltage reference
FB & COMP: Open loop failure protection
(with aux winding)
100
CONT pin (Viperx7 & x8 )
101
GND / SOURCE DRAIN
FB
DRAIN
CONT+~
VDD
VIPerx7+
VIPerx8~
BR+ / EPT~
CONT pin: What you can do?
To choose the IDLIM level (RLIM)
To fix the Over Voltage Protection (RLIM & ROVP, DOVP)
102
Auxiliary
winding
ROVP
RLIM
DOVP
GND / SOURCE DRAIN
FB
DRAIN
CONT
VDD
BR / EPT
VIPERx7VIPERX8
CONT pin: IDLIM set point
Advantages :
Transformer optimization and accurate OLP.
Flexibility vs design changes
Flexibility vs different Projects (stock optimization)
103
RLIM
GND / SOURCE DRAIN
FB
DRAIN
CONT
VDD
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0 20 40 60 80 100
RLIM [K ]
I DL
IM
(Norm
aliz
ed t
o I
DLIM
whitout
RLIM
)VIPERx7VIPERX8
BR / EPT
CONT pin: Over Voltage Protection
104
Auxiliary
winding
ROVP
RLIM
DOVP
GND / SOURCE DRAIN
FB
DRAIN
CONT
VDDVIPerx7VIPerx8
KRLIM 100
+
DOVPDSECOVP
SEC
AUX
OVPOVP
VVVoutN
N
VK
OVP
OVPLIMOVP
k
kRR
1 VCONT = VOVP= 3V
3 V
VCONT
VDS
KRLIM 50
or
BR / EPT
LIM pin (Viperx6)
105
GND / SOURCE DRAIN
FB
DRAIN
LIM^
VDD
Viper16^
COMP^
LIM pin: What you can do?
106
RLIM
GND / SOURCE DRAIN
FB
DRAIN
LIM
VDD
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0 20 40 60 80 100
RLIM [K ]
I DL
IM
(Norm
aliz
ed t
o I
DLIM
whitout
RLIM
)
VIPERx6
To choose the IDLIM level (RLIM)
RLIM>100 kOhm or pin float:
IDlim default (typ, 400mA)
RLIM< 80 kOhm:
IDlim decreased continuously according to the current
sunk from the LIM pin
ZCD pin (Viperx5)
107
GND / SOURCE DRAIN
FB
DRAIN
ZCD*
VDD
VIPerx5*
BR*+
ZCD pin: What you can do?
Transformer demagnetization Sensing (Zero Voltage Detection)
To choose the IDLIM level (RLIM)
To fix the Over Voltage Protection (RLIM & ROVP, DOVP)
To have dynamic IDLIM Adjustment for almost constant maximum
power versus converter input voltage (Voltage Feed Forward
function)
108
Auxiliary
winding
ROVP
RLIM
DOVP
GND / SOURCE DRAIN
FB
DRAIN
ZCD
VDD
BR
VIPERx5
RFF
ZCD pin: IDLIM set point
Advantages :
Transformer optimization and accurate OLP.
Flexibility vs design changes
Flexibility vs different Projects (stock optimization)
109
RLIM
GND / SOURCE DRAIN
FB
DRAIN
ZCD
VDD
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0 20 40 60 80 100
RLIM [K ]
I DL
IM
(Norm
aliz
ed t
o I
DLIM
whitout
RLIM
)
VIPERx5
BR
ZCD pin: Over Voltage Protection
110
Auxiliary
winding
ROVP
RLIM
DOVP
GND / SOURCE DRAIN
FB
DRAIN
ZCD
VDDVIPerx5
KRLIM 100
+
DOVPDSECOVP
SEC
AUX
OVPOVP
VVVoutN
N
VK
OVP
OVPLIMOVP
k
kRR
1 VCONT = VOVP= 3V
3 V
VCONT
VDS
KRLIM 50
or
BR
ZCD pin: Power MOSFET turn on
111
ZCD LOWER CLAMP
t
VDS
t
t
VZCD
t
VAUX
ARMING LEVEL
TRIGGER LEVEL
Turn on DELAY
IDRAIN
The Power MOSFET turn on is controlled by the ZCD pin. Turn off
Auxiliary
winding
ROVP
RLIM
DOVP
GND / SOURCE DRAIN
FB
DRAIN
ZCD
VDD
BR
VIPERx5
RFF
VZCD
VAUX
DEGMAGNETIZATION PHASE
Steady state operation
POWER Capability and switching frequency
In quasi resonant Flyback converter the
switching frequency changes with:
Input Voltage
Load
112
Where fT is:
Where fr is:
BR pin (IC supply)
113
GND / SOURCE DRAIN
FB
DRAIN
CONT+/ ZCD*
VDD VIPerx5*
VIPerx7+
BR*+
BR pin: What you can do?
To interdict the switching during low input voltage (VIN)
VIN(OFF) and VIN(ON) thresholds can be separately fixed by the
current hysteresis
Brownout protection input with hysteresis.
A voltage below the threshold VBRth shuts down (not latch) the
device and lowers the power consumption.
Device operation restarts as the voltage exceeds the threshold
VBRth + VBRhyst.
Advantages
Reduce the RMS current
Guaranty monotonic output voltage decreasing during the
converter turn off
114
BR pin: VIN(ON) & VIN(OFF)
115
BR
GND / SOURCE DRAIN
CONT / ZCD
DRAINVDD
FB
VIPERx5
VIPERx7R1
R2
VINDC
IBR_hyst
450 mV
VIN
VIN(ON)
VIN(OFF)
10 A
VBR
IBR_hyst
100 mV
FSW = 60 KHz FSW = 60 KHzFSW = 0 KHz
HYSH
L
LHHYSBRBRthONIN IR
R
RRVVV _
L
LHBRthOFFIN
R
RRVV
BR pin: To disable the Brown out
116
450 mV
100 mV
VIN
VIN(ON)
VIN(OFF)
15 A
VBR
IBR_hyst
Brown out
disable level
FSW = 60 KHz
BR
GND / SOURCE DRAIN
CONT /ZCD
DRAINVDD
FB
VIPERx5
VIPERx7
EPT pin (Viperx8 )
117
GND / SOURCE DRAIN
FB
DRAIN
CONT+~
VDD
VIPerx8~
EPT~
EPT pin: What you can do?
Give extra out power for programmed time
118
IDLIM = 750mA
IDLIM_EPT = 85% IDLIM =650mA
IDRAIN> IDLIM_EPT ;5 A charges CEPT and
Vout is regulated
VEPT(STOP)
VEPT(RESTART)
V (EPT)
Operations restarts here
GND DRAIN
FB
DRAIN
CONT
EPT
VIPerx8VDD
CEPT
5uA
2nd OCP - IC PROTECTION
Present in Viperx5, Viperx7 & Viperx8
To latch the power after extra drain current…, upper than IDLIM
Noise filter with latch after the 2nd event (i.e. during the ESD)
AUTOMATIC AUTORESTART after the 2nd OCP latch
Advantages
Protection from SHORT CIRCUIT in secondary diode
Protection from HEAVY TRANSFORMER SATURATIONS
System RELIABILITY
119
TBLANK
t
2nd OCP
IDRAIN
IDILM
ALTAIR & HVLED
Optoless Current & Voltage Controllers
120
Device objective – Standard configuration
Accurate CC-CV regulation
Need dedicated CV-CC regulator
Need secondary components and opto
Power dissipation on sense resistor
Expensive solution
121
ST - Proposed configuration
Control of output voltage and current entirely from
primary side
Save all secondary regulation components (voltage
reference, error amplifiers, optocoupler, sense resistor)
122
Technology
123
BCD6 controller technologyWith OTP (one time programmable) trimming
function available for the end user
ZCD/FB
VCC
COMP
Out
CONTROL
On-Off
Gate
Sense
SOURCE
Out
Gnd1
Sense
Gate
On/Off
DRAIN
IREF
800V Avalanche Ruggedness Power MOSFET
in SuperMESH Technology
CDC
GND
TR
IM
DA
TA
CL
OC
K
Main electrical parameters – HVLED805
Main Features
Main parametersMAIN PARAMETERS
Power MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 800
RDSon [Ohm] 11
VDD [V] 11.5 ÷ 23
FOSC [KHz] Up to 166 kHz
Restart time during burst mode( 500us
RTHJ-A [°C/W] (1) 80
POUT [W] @ 85-265VAC 5
(1) Package SO16N and 100mm2 of Cu
SOURCE
Power section Source
Vcc
controller supply voltage / ICHARGE output current
GND
controller ground
ILED
Current loop reference
DMG
Zero Current Detection
COMP
Compensation network
DRAIN
Power section Drain
Pin description
800V, avalanche rugged power section
QR current-mode PWM controller in BCD6 technology
Constant voltage and constant current output regulation (CV/CC) with no optocoupler
Optimized for LED
High performance for stand-by & efficiency
Integrated protections: 2nd OCP, open loop protection (brownout) OLP, high OCP
Automatic auto restart after fault
SO16
Main electrical parameters – ALTAIR05T-800
Main Features
Main parametersMAIN PARAMETERS
Power MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 800
RDSon [Ohm] 11
VDD [V] 11.5 ÷ 23
FOSC [KHz] Up to 166 kHz
Restart time during burst mode(1) 500us
RTHJ-A [°C/W] (2) 80
POUT [W] @ 85-265VAC 6
(1) Also 125us, 250us and 1ms available
(2) Package SO16N and 100mm2 of Cu
SOURCE
Power section Source
Vcc
controller supply voltage / ICHARGE output current
GND
controller ground
IREF
Current loop reference
ZCD/FB
Zero Current Detection, Cvregulation, FF compensation
COMP
Compensation network
CDC
Cable Drop Cpmplensation
DRAIN
Power section Drain
Pin description
800V, avalanche rugged power section
QR current-mode PWM controller in BCD6 technology
Constant voltage and constant current output regulation (CV/CC) with no optocoupler
High performance for stand-by & efficiency
Integrated protections: 2nd OCP, open loop protection (brownout) OLP, high OCP
Automatic auto restart after fault
N.A.
N.A. CDC
SOURCE DRAIN
SOURCE
GND
IREF
ZCD/FB
COMP
Vcc
DRAIN
DRAIN
DRAIN
N.A.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N.C.
N.A.
N.A. CDC
SOURCE DRAIN
SOURCE
GND
IREF
ZCD/FB
COMP
Vcc
DRAIN
DRAIN
DRAIN
DRAIN
DRAIN
N.A.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N.C.
SO16
Main electrical parameters – ALTAIR04-900
Main parameters
(1) Also 125us, 250us and 1ms available
(2) Package SO16N and 100mm2 of Cu
SOURCE
Power section Source
Vcc
controller supply voltage / ICHARGE output current
GND
controller ground
IREF
Current loop reference
ZCD/FB
Zero Current Detection, Cvregulation, FF compensation
COMP
Compensation network
DRAIN
Power section Drain
900V, avalanche rugged power section
QR current-mode PWM controller in BCD6 technology
Constant voltage and constant current output regulation (CV/CC) with no optocoupler
High performance for stand-by & efficiency
Integrated protections: 2nd OCP, open loop protection (brownout) OLP, high OCP
Automatic auto restart after fault
SO16
Main Features Pin description
MAIN PARAMETERSPower MOSFET
(SuperMESH)
CONTROLLER
(BCD6S)
Break down voltage [V] 900
RDSon [Ohm] 16
VDD [V] 11.5 ÷ 23
FOSC [KHz] Up to 166 kHz
Restart time during burst mode(1) 500us
RTHJ-A [°C/W] (2) 50
POUT [W] @ 85-265VAC 5
N.C.
N.C.N.C.
SOURCE DRAIN
SOURCE
GND
IREF
ZCD/FB
COMP
Vcc
DRAIN
DRAIN
DRAIN
N.C.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N.C.
N.C.
N.C.N.C.
SOURCE DRAIN
SOURCE
GND
IREF
ZCD/FB
COMP
Vcc
DRAIN
DRAIN
DRAIN
DRAIN
DRAIN
N.C.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N.C.
Typical load regulation cv/cc: high accuracy
127
0 200 400 600 800 1000 1200
0
1
2
3
4
5
6
Ou
tpu
t V
oltag
e [V
]
Output Current [mA]
HV Startup is ON
High current accuracy:
+/-5%
High voltage accuracy
+/-2.5%
CV Mode – Principe of operations
Vaux
GND
An accurate image of the output voltage can be obtained by sampling the voltage of the auxiliary winding right at the end of transformer’s demagnetization. We use our proprietary technique to do the job.
CC Mode – Principe of operations
t
t
t
t
IP
Is
Q
IC
T
REFI
R
VI
CCREF
REFI
I REFOUT
SENSE
R In
2 R
Valid in DCM only
Iout not depend on either Vin, Vout or Fsw
Layout Recommendations
Viper Family
Layout Rules
Some simple rules insure a correct running of
switching power supplies. They may be classified
into two categories:
To minimize power loops
Split low level signals and power
Thermal management is important too, consider:
Copper in Drain pin for thermal dissipation
Helps for instantaneous thermal peaks
Dissipates heat from Drain
131
Layout Rules
To minimize power loops:
The way the switched power current must be carefully analyzed
and the corresponding paths must present the smallest possible
inner loop area. This avoids radiated EMC noises, conducted
EMC noises by magnetic coupling, and provides a better
efficiency by eliminating parasitic inductances, especially on
secondary side.
To use different tracks for low level signals and power
ones.
The interferences due to a mixing of signal and power may result
in instabilities and/or anomalous behavior of the device in case of
violent power surge (Input overvoltages, output short circuits...).
132
Viper Loops
In case of VIPer, these rules apply as shown:
Loops that must be minimized:
C1-T1-U1
C5-D2-T1
C7-D1-T1
C6 must be as close as possible to T1
C2, ISO1, C3 and C4 use a dedicated track to be
connected directly to the source of the device
133
Viper Loops
134
Viper Loops Analysis
Schematic for Loop Analysis
135
Loop Analysis
Layout for Loop Analysis
136
Loop A, High Voltage
137
Loop B, Low Signals
138
Loop C, Small signal GND
139
Loop D, Output
140
Y Capacitor, Primary & Secondary
141
As close as possible to Transformer
e-DESIGN
142