nsi3190 active clamp forward system user guide · onnecting p1\p2\p3\p4, p10 for refout fast start...

$: NSi3190 Active Clamp Forward System User Guide · onnecting P1\P2\P3\P4, P10 for REFout fast start and P13 for soft start Optooupler+NP431 loop: onnecting P5\P6 to replace the connectors$
NSi3190 Active Clamp Forward System User Guide

User Guide 1.0

Copyright © 2019, NOVOSENSE

Page 1

Features

Full support evaluation kit for the NSi3190, 10W output forward topology case this EVB system is designed

for 5V\2A DC output, combining the main IC NCP1566D and isolation error amplifier NSi3190 together.

Two types feedback loops configuration are provided for comparison using, one type is NSi3190 and the

other is OptoCoupler+NCP431.

Figure1.NSi3190 EVA board

NSi3190 User Guide 1.0

Copyright © 2019, NOVOSENSE

Page 2

INDEX

1. SYSTEM OVERVIEW ............................................................................................................................................................. 3

1.1 FUNCTION OVERVIEW .............................................................................................................................................. 3 1.2 EVALUATION BOARD HARDWARE OVERVIEW ........................................................................................................... 3 1.3 SCHEMATIC .............................................................................................................................................................. 4 1.4 CONNECTING AND POWERING UP ............................................................................................................................ 4

1.4.1 CONNECTING ............................................................................................................................................................................... 4 1.4.2 POWERING UP AND LOOP SELECTION ......................................................................................................................................... 5

2. KEY DESIGN PARAMETER INTRODUTION ............................................................................................................................. 5

2.1. FEED BACK LOOP COMPENSATION OF NSI3190 ......................................................................................................... 5 2.2. FOR QUICK AND SLOW START REFOUT OF NSI3190 ................................................................................................... 5 2.3. APPLICATION CIRCUIT FOR IOUT OUTPUT OF THE SYSTEM ......................................................................................... 6

3. EVALUATING DATA OF FORWARD SYSTEM ........................................................................................................................... 6

3.1. NSI3190 TYPICAL EVALUATING FIGURE ..................................................................................................................... 7 3.2. OPTOCOUPLER+NCP431 TYPICAL EVALUATING FIGURE ................................................................................................ 9 3.3. THE SCHEME COMPARION BETWEEN NSI3190 AND OPTOCOUPLER+NCP431 .............................................................. 10

4. PCB LAYOUT AND BOM OF THE DEMO .............................................................................................................................. 10

4.1. PCB LAYOUT ............................................................................................................................................................ 10 4.2. BOM LIST ................................................................................................................................................................ 11


Copyright © 2019, NOVOSENSE Page 3

1. SYSTEM OVERVIEW

1.1 FUNCTION OVERVIEW

This evaluation board features the forward topology in a dc-to-dc switching power supply with main controller NCP1566 and isolation error amplifier NSi3190. The circuit is designed to provide 5Vdc 2A from a DC input voltage source of 12Vdc input. Operating in CCM mode and provides features including UVLO\OVP\OCP, synchronous rectification,constant current control, loop compensation configuration. Two feedback loops are provided for comparison configuration, one loop is NSi3190 and the other is OptoCoupler+NCP431.

1.2 EVALUATION BOARD HARDWARE OVERVIEW

Hardware overview:

Figure2.NSI3190 EVA board 3D

The evaluation board is shown in Figure 2, the main circuit is driven by NCP1566 with active clamp PWM regulation mode,

The input filter consists with Π type and LC type filtering

The main switch part using active clamp PWM regulation technology

Auxiliary Winding supply for VCC of NCP1566

A Linear hypotension circuit is alternative for VDD1 of NSi3190

Transformer Tm provides isolation and power transmission,

Second side provides synchronous rectification function

Feedback loop both NSi3190 and OptoCoupler+NCP431 are provided

http://www.baidu.com/link?url=XGYhEBiAYjj9oYQ3fJOIHLTlOVQDWOuW5d5rlAhJYgKPPjtHysntVG4JQX8APOmegv-Y-9nqCtjvufsttPd6F5t6p0RszAkft81zi5UPTNQNDDQ1d8vlwAGtDUx406SU&wd=&eqid=ec20d6b9000294d3000000045ea78fe5

http://www.baidu.com/link?url=Lg_WGwe2E6rvzsm-yfEOo90eMhgLyCDc15XMqHwaJxxlOIDoM2wL695O71pyIMI2uMtnr1f3nwD0PDr35vYG9nke6vIM4cFYiwPcmNiHRl7KeYEze1t9ADvVHATZkY_o&wd=&eqid=872db6f9000151f9000000055ea7a5b0



1.3 SCHEMATIC

Figure 3. Schematic of EVA board

1.4 CONNECTING AND POWERING UP

1.4.1 CONNECTING

Connector Function

P8 VIN+, VIN- DC input

P9 VOUT+, VOUT- DC output

P1 Power supply for VDD1

P2 Power supply for VDD2

P3\P4 Feedback loop for NSI3190

P5\P6 OptoCoupler+NCP431

P7 Alternative compensation Pin of NCP1566

P10 IN+ pin to REFout pin of NSI 3190

P13 Soft start of IN+ pin to REFout pin of NSI3190

P11 Alternative power supply for VDD1of NSI3190



1.4.2 POWERING UP AND LOOP SELECTION

Powering up:

Connecting P8\P9, setting input typical voltage of 12Vdc

NSi3190 feedback loop:

Connecting P1\P2\P3\P4, P10 for REFout fast start and P13 for soft start

OptoCoupler+NCP431 loop:

Connecting P5\P6 to replace the connectors of NSI3190 loop

2. KEY DESIGN PARAMETER INTRODUTION

2.1. FEED BACK LOOP COMPENSATION OF NSI3190

For NSi3190 is a Voltage type compensation, in this case we set type 2 compensation:

IN+

RH

RL

C15

C16 R16

IN-

REFout

Figure 4. Loop compensation of NSI3190

Gian(s)=（1+SC16R16）/[S RH (C15+C16) * (1+SC15 R16) ]

≈（1+SC16R16）/[(SC16RH) *(1+SC15 R16)] for C16>> C15

For NSi3190 case parameter configuration:

C16=10nF, R16=10K, C15=1nF

FP=1/ 2ΠC15 R16≈15.92KHZ

FZ=1/2ΠC16R16≈1.592KHZ

For OptoCoupler+NCP431 case：

C22=100nF, R29=10K, C17=4.7nF

FP=1/ 2ΠC17R29≈3.39KHZ

FZ=1/2ΠC22R29≈159.2HZ

2.2. FOR QUICK AND SLOW START REFOUT OF NSi3190

As below figure：






Figure5.Starting mode of NSi3190

Quick start of REFout can be achieved by connecting P10 directly

Slow start of REFout can be achieved using P13 replace P10

The delay start time can be adjust through the value of R31 and C29

2.3. APPLICATION CIRCUIT FOR Iout OUTPUT OF THE SYSTEM

FORWARD

POWER

STAGE

VREF

RAMPPWM comp

COMP

PWM CONTROLLER

INSIDE NCP1566

VOUT

VIN

IOUT

GND1

+IN

NSI3190GND2

COMP

1

5

6

7

8 9

10

11

12

VDD1

-IN

EAOUT1 X1 RX TX

EAOUT2

CM

RX

131.225V

REFOUT

RH

RL

C15

C16 R16

Figure6.Application circuit of NSi3190

The IOUT output to the current mirror inside of NCP1566 to adjust the feed back loop, we can set key parameters as below formula:

VREF =VOUT*RL/(RL+RH)

For this NSi3190 feedback case, VREF =1.225V, setting RH=80K, RL=26.8K can meet the requirement of VOUT=5V.

3. EVALUATING DATA OF FORWARD SYSTEM





3.1. NSi3190 TYPICAL EVALUATING FIGURE

Starting up of full load 5V 2A output：

Figure7.Starting up of full load 5V 2A output

As figure6 the starting up time of full load is about 17.7ms, there is not obvious overshot can be seen during this starting up process.

VGS and VDS of main switch Q3 wave form

Figure8.VGS and VDS of Q3

VGS and VCS of main switch Q3

Uout

Vcs starting up envelope

VDS VDS t

VDS

VGS VDS t

VDS



Figure 9.VGS and VCS of Q3

Iout calculated of NSi3190:

Figure 10.The current of Iout test

For 3190 Iout test, series 120 ohm resistance in Iout feedback loop, then test the voltage of the resistance about 61mV，finally

caculating the Iout=61/120（mA）=508uA

Load transient from 50mA jump to 2A of NSi3190:

Figure 11.Load transient from 50mA jump to 2A

VGS VDS t

VDS

VCS VDS t

VDS

The voltage of 120ohm resistance

Vout VDS t

VDS

Io VDS t

VDS



The peak deviation is only 45mV，settling time240uS

3.2. OptoCoupler+NCP431 TYPICAL EVALUATING FIGURE

Starting up of full load 5V 2A output

Figure 12. Full load start

As figure12 the starting up time of Full load is about 12.9ms, there is not obvious overshot can be seen during this starting up process.

VGS and VCS of main switch Q3

Figure13.VGS and VCS of Q3

Load transient from 50mA jump to 2A of OptoCoupler+NCP431

Vout VDS t

VDS

VGS VDS t

VDS

VCS VDS t

VDS

Vout VDS t

VDS

Io



Figure14.Load transient from 50mA jump to 2A

The peak deviation is only 70mV，settling time352uS

3.3. THE SCHEME COMPARION BETWEEN NSi3190 AND OptoCoupler+NCP431

According to this case, bellowing comparison items can be summed up:

Items OptoCoupler +NCP431 NSi3190

Transmission bandwidth

50kHz 400KHZ

Power dissipation 230mW 37.5mW

Typical

accuracy@ 25°C ±0.5% ±0.25%

Accuracy of reference full temperature

41.20ppm°C 8.88ppm°C

Operating temperature

-40~100°C -40~125°C

Transmission stability full

temperature CTR (%) decreased seriously≥20% Stable gain alterations≤10%

Package of active devices

SOP4L+(SOT-23) SSOP16

Feedback control style

IC=ID*CTR Current style：IOUT

Voltage style：EAOUT2

4. PCB LAYOUT AND BOM OF THE DEMO

4.1. PCB LAYOUT

Top-layer overview



Figure15.Top-layer overview

Bottom-layer overview

Figure 16. Bottom-layer overview

4.2. BOM LIST

Num Type Manufacturer package location Qty/ per parameter

1 IRF6217 International

Rectifier SO-8C Q4 1




2 FDD2582 ON

Semiconductor TO-252AA Q3 1

3 IPD053N06N Infineon DPAK

(TO-252) Q1\Q2 2

4 MMBT4401 ON Semiconductor SOT23 Q5 1

5 NCP431 ON Semiconductor SOT23-3 U4 1

6 NCP1566 ON Semiconductor QFN24 U1 1

7 PS2703-1 Renesas SOP4 U3 1

8 SS54 HY ELECTRONIC SMC D1\D2 2 5A\40V

9 LMBR120ETIG LRC SOD-123 D3\D5 2 1A\20V

10 B240 DIODES SMB D4\D8 2 2A\28V

11 BZX84C5V6 ON Semiconductor SOT-23 D6 1 5.6V

12 VCMT063T-6R8MN5T cyntek 7.3*6.8*3 L1 1 6.8uh

13 VCMT104T-150MN5 cyntek 11.2*10.3*4.0 L3 1 15uh

14 INDUCTOR cyntek 7.3*6.8*3 L2 1 1mh

15 CAP KEMET 0805 C36 \C37

3 10nF\50V

16 CAP KEMET 1206 C3\C4\C14 3 2.2UF\50V

17 CAP KEMET 1210 C19 1 2.2uF\100V

18 CAP KEMET 0805 C9 1 330pF\50V

19 CAP KEMET 0805 C17 1 4.7nF\50V

20 CAP KEMET 0805 C10 1 100nF\50V

21 CAP KEMET 0805 C20 1 1.5nF\50V

22 CAP KEMET 0805 C21 1 22nF\50V

23 CAP KEMET 0805 C12 2 10nF\50V

24 CAP KEMET 0805 C16\C22 1 100nF\50V

25 CAP KEMET 0805 C13 1 220PF\50V

25 CAP KEMET 0805 C5 1 220nF\50V

26 CAP KEMET 0805 C11 1 330nF\50V

27 CAP KEMET 0805 C18 1 4.7uF\50V

29 CAP KEMET 0805 C6 1 10uF\25V

30 CAP KEMET 0805 C15 1 1nF\50V

31 CAP KEMET 1206 C7\C8 2 10nF\50V




32 CAP KEMET 1210 C1\C2 1 100uf\16v

33 RES KEMET 0805 R6 1 82K

34 RES KEMET 0805 R12 1 16K

35 RES KEMET 0805 R10 1 60K

36 RES KEMET 0805 R11 1 120K//82K

37 RES KEMET 0805 R7\R15 2 30K

38 RES KEMET 0805 R14 2 1K

39 RES KEMET 0805 R2 2 60K

40 RES KEMET 0805 R16\R17 \R26\R29

4 10K

41 RES KEMET 0805 R4\R21\ R22\R32

2 20K

42 RES KEMET 0805 R3 1 120K

43 RES KEMET 0805 R25 1 150K

44 RES KEMET 0805 R19\R43 2 500ohm

45 RES KEMET 0805 R1\R5

\R8 3 10ohm

46 RES KEMET 0805 R28 1 0ohm

47 RES KEMET 0805 R18\R20 1 2K

48 RES KEMET 0805 R13\R33 1 6.8K

49 RES KEMET 1206 R23\R24\R2

7 3 20ohm

50 RES

KEMET 2512 R44-1 1 100mohm

51 KEMET 2512 R44-2 1 75mohm

nsi3190 active clamp forward system user guide · onnecting p1\p2\p3\p4, p10 for refout fast start...

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