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  • SN6501 Transformer Driver for Isolated Power Supplies

    • SLLSEA0I February   2012  – January 2021 SN6501

      PRODUCTION DATA  

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  • SN6501 Transformer Driver for Isolated Power Supplies
  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Handling Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Typical Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Push-Pull Converter
      2. 7.3.2 Core Magnetization
    4. 7.4 Device Functional Modes
      1. 7.4.1 Start-Up Mode
      2. 7.4.2 Operating Mode
      3. 7.4.3 Off-Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 SN6501 Drive Capability
        2. 8.2.2.2 LDO Selection
        3. 8.2.2.3 Diode Selection
        4. 8.2.2.4 Capacitor Selection
        5. 8.2.2.5 Transformer Selection
          1. 8.2.2.5.1 V-t Product Calculation
          2. 8.2.2.5.2 Turns Ratio Estimate
          3. 8.2.2.5.3 Recommended Transformers
      3. 8.2.3 Application Curve
      4. 8.2.4 Higher Output Voltage Designs
      5. 8.2.5 Application Circuits
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE
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DATA SHEET

SN6501 Transformer Driver for Isolated Power Supplies

1 Features

  • Push-pull driver for small transformers
  • Single 3.3-V or 5-V supply
  • High primary-side current drive:
    • 5-V Supply: 350 mA (Max)
    • 3.3-V Supply: 150 mA (Max)
  • Low ripple on rectified output permits small output capacitors
  • Small 5-Pin SOT-23 Package

2 Applications

  • Isolated interface power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, Low-Power LAN
  • Industrial automation
  • Process control
  • Medical equipment

3 Description

The SN6501 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power supplies in isolated interface applications. The device drives a low-profile, center-tapped transformer primary from a 3.3-V or 5-V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer turns ratio.

The SN6501 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make action between the two switches.

The SN6501 is available in a small SOT-23 (5) package, and is specified for operation at temperatures from –40°C to 125°C.

Device Information
PART NUMBER(1)PACKAGEBODY SIZE (NOM)
SN6501SOT-23 (5)2.90 mm x 1.60 mm
(1) For all available packages, see the orderable addendum at the end of the datasheet.
GUID-5FBD9689-A05F-4DF0-BDDA-E6F494D0D37C-low.gifSimplified Schematic.
GUID-EC1F511A-AD85-487A-9CE1-7993E5AB9895-low.gifOutput Voltage and Efficiency vs Output Current.

Revision History

Changes from Revision H (July 2019) to Revision I (January 2021)

  • Added a short-circuit protection note to Section 8.2.2.1 Go
  • Removed duplicate equation labeled as (5) in Revision H Go

Changes from Revision G (July 2014) to Revision H (July 2019)

  • Added HCT-SM-1.3-8-2 transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo
  • Added EPC3668G-LF transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo
  • Added DA2303-AL transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo
  • Added DA2304-AL transformer to Recommended Isolation Transformers Optimized for SN6501Table 8-3 tableGo

Changes from Revision F (August 2013) to Revision G (July 2014)

  • Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

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

  • Added Figure 5-13 and Figure 5-14 Go
  • Added Figure 5-17 through Figure 5-18 Go
  • Added Figure 5-23 through Figure 5-24 Go
  • Changed Table 8-3 - Recommended Isolation Transformers Optimized for SN6501Go

Changes from Revision D (September 2012) to Revision E (January 2013)

  • Changed Figure 5-23 Go

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

  • Changed fOSC, Oscillator frequency To: fSW, D1, D2 Switching frequency Go
  • Added graphs Figure 5-3 through Figure 5-4 Go
  • Changed the title of Figure 5-30 From: D1, D2 Oscillator Frequency vs Free-Air Temperature To: D1, D2 Switching Frequency vs Free-Air TemperatureGo
  • Added section: Recommended TransformersGo
  • Changed the location and title of Figure 8-7 Go

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

  • Changed the fOSC Oscillator frequency values Go
  • Changed unique_46_Connect_42_SLLSEAE06272Equation 4 Go

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

  • Changed Feature From: Small 5-pin DBV Package To: Small 5-pin SOT23 PackageGo
  • Changed Figure 8-7 titleGo

Changes from Revision * (February 2012) to Revision A (March 2012)

  • Changed the device From: Product Preview To: ProductionGo
  • Changed unique_47_Connect_42_SLLSEA08743Equation 9 Go
  • Changed unique_47_Connect_42_SLLSAE0173Equation 10 Go
  • Changed Table 8-4, From: Wuerth-Elektronik / Midcom To: Wurth Electronics Midcom IncGo
  • Changed Figure 8-16 Go

 
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