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    ReferenceDesign

    SN6501SLLSEA0G FEBRUARY 2012REVISED SEPTEMBER 2014

    SN6501 Transformer Driver for Isolated Power Supplies1 Features 3 Description

    The SN6501 is a monolithic oscillator/power-driver,1 Push-Pull Driver for Small Transformers

    specifically designed for small form factor, isolated Single 3.3-V or 5-V Supply power supplies in isolated interface applications. The High Primary-side Current Drive: device drives a low-profile, center-tapped transformer

    primary from a 3.3-V or 5-V DC power supply. The 5-V Supply: 350 mA (Max)secondary can be wound to provide any isolated 3.3-V Supply: 150 mA (Max) voltage based on transformer turns ratio.

    Low Ripple on Rectified Output Permits SmallThe SN6501 consists of an oscillator followed by aOutput Capacitorsgate drive circuit that provides the complementary

    Small 5-Pin SOT-23 Package output signals to drive the ground referenced N-channel power switches. The internal logic ensures

    2 Applications break-before-make action between the two switches. Isolated Interface Power Supply for CAN, RS-485, The SN6501 is available in a small SOT-23 (5)

    RS-422, RS-232, SPI, I2C, Low-Power LAN package, and is specified for operation attemperatures from 40C to 125C. Industrial Automation

    Process Control Device Information(1) Medical Equipment

    PART NUMBER PACKAGE BODY SIZE (NOM)SN6501 SOT-23 (5) 2.90 mm x 1.60 mm

    (1) For all available packages, see the orderable addendum atthe end of the datasheet.

    Simplified Schematic Output Voltage and Efficiency vs Output Current

    1

    An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,intellectual property matters and other important disclaimers. PRODUCTION DATA.

    http://www.ti.com/product/SN6501?dcmp=dsproject&hqs=pfhttp://www.ti.com/product/SN6501?dcmp=dsproject&hqs=sandbuysamplebuyhttp://www.ti.com/product/SN6501?dcmp=dsproject&hqs=tddoctype2http://www.ti.com/product/SN6501?dcmp=dsproject&hqs=swdesKithttp://www.ti.com/product/SN6501?dcmp=dsproject&hqs=supportcommunityhttp://www.ti.com/tool/TIDA-00267?dcmp=dsprojecthttp://www.ti.com/product/sn6501?qgpn=sn6501

  • SN6501SLLSEA0G FEBRUARY 2012REVISED SEPTEMBER 2014 www.ti.com

    Table of Contents8.2 Functional Block Diagram ....................................... 121 Features .................................................................. 18.3 Feature Description................................................. 132 Applications ........................................................... 18.4 Device Functional Modes........................................ 143 Description ............................................................. 1

    9 Application and Implementation ........................ 154 Revision History..................................................... 29.1 Application Information............................................ 155 Pin Configuration and Functions ......................... 49.2 Typical Application .................................................. 166 Specifications......................................................... 4

    10 Power Supply Recommendations ..................... 266.1 Absolute Maximum Ratings ...................................... 411 Layout................................................................... 266.2 Handling Ratings....................................................... 4

    11.1 Layout Guidelines ................................................. 266.3 Recommended Operating Conditions....................... 511.2 Layout Example .................................................... 266.4 Thermal Information .................................................. 5

    12 Device and Documentation Support ................. 276.5 Electrical Characteristics........................................... 512.1 Device Support...................................................... 276.6 Switching Characteristics .......................................... 512.2 Trademarks ........................................................... 276.7 Typical Characteristics .............................................. 612.3 Electrostatic Discharge Caution............................ 277 Parameter Measurement Information ................ 1212.4 Glossary ................................................................ 278 Detailed Description ............................................ 12

    13 Mechanical, Packaging, and Orderable8.1 Overview ................................................................. 12Information ........................................................... 27

    4 Revision HistoryNOTE: Page numbers for previous revisions may differ from page numbers in the current version.

    Changes from Revision F (August 2013) to Revision G Page

    Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, DeviceFunctional Modes, Application and Implementation section, Power Supply Recommendations section, Layoutsection, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Informationsection ................................................................................................................................................................................... 1

    Changes from Revision E (January 2013) to Revision F Page

    Added Figure 13 and Figure 14.............................................................................................................................................. 7 Added Figure 17 through Figure 18 ....................................................................................................................................... 7 Added Figure 23 through Figure 24 ....................................................................................................................................... 8 Changed Table 3 - Recommended Isolation Transformers Optimized for SN6501............................................................. 20

    Changes from Revision D (September 2012) to Revision E Page

    Changed Figure 23................................................................................................................................................................. 8

    Changes from Revision C (March 2012) to Revision D Page

    Changed fOSC, Oscillator frequency To: fSW, D1, D2 Switching frequency ............................................................................ 5 Added graphs Figure 3 through Figure 4 ............................................................................................................................... 6 Changed the title of Figure 30 From: D1, D2 Oscillator Frequency vs Free-Air Temperature To: D1, D2 Switching

    Frequency vs Free-Air Temperature ...................................................................................................................................... 9 Added section: Recommended Transformers ...................................................................................................................... 19 Changed the location and title of Figure 45 ......................................................................................................................... 19

    2 Submit Documentation Feedback Copyright 20122014, Texas Instruments Incorporated

    Product Folder Links: SN6501

    http://www.ti.com/product/sn6501?qgpn=sn6501http://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLLSEA0G&partnum=SN6501http://www.ti.com/product/sn6501?qgpn=sn6501

  • SN6501www.ti.com SLLSEA0G FEBRUARY 2012REVISED SEPTEMBER 2014

    Changes from Revision B (March 2012) to Revision C Page

    Changed the fOSC Oscillator frequency values ...................................................................................................................... 5 Changed Equation 4............................................................................................................................................................. 18

    Changes from Revision A (March 2012) to Revision B Page

    Changed Feature From: Small 5-pin DBV Package To: Small 5-pin SOT23 Package.......................................................... 1 Changed Figure 45 title ........................................................................................................................................................ 19

    Changes from Original (February 2012) to Revision A Page

    Changed the device From: Product Preview To: Production ................................................................................................. 1 Changed Equation 10........................................................................................................................................................... 19 Changed Equation 11........................................................................................................................................................... 19 Changed Table 4, From: Wuerth-Elektronik / Midcom To: Wurth Electronics Midcom Inc .................................................. 21 Changed Figure 54............................................................................................................................................................... 24

    Copyright 20122014, Texas Instruments Incorporated Submit Documentation Feedback 3

    Product Folder Links: SN6501

    http://www.ti.com/product/sn6501?qgpn=sn6501http://www.ti.comhttp://www.go-dsp.com/forms/techdoc/doc_feedback.htm?litnum=SLLSEA0G&partnum=SN6501http://www.ti.com/product/sn6501?qgpn=sn6501

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