SLVSAV0B April   2011  – October 2014 TPS55010

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Rating
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency PWM Control
      2. 8.3.2  Half Bridge and Bootstrap Voltage
      3. 8.3.3  Error Amplifier
      4. 8.3.4  Voltage Reference
      5. 8.3.5  Adjusting the Output Voltage
      6. 8.3.6  Enable and Adjusting Undervoltage Lockout
      7. 8.3.7  Adjusting Slow Start Time
      8. 8.3.8  Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      9. 8.3.9  How to Interface to RT/CLK Pin
      10. 8.3.10 Overcurrent Protection
      11. 8.3.11 Reverse Overcurrent Protection
      12. 8.3.12 FAULT Pin
      13. 8.3.13 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation of the Fly-Buck™ Converter
  9. 9 Application And Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1  Design Guide - Step-by-Step Design Procedure
      2. 9.2.2  Primary Side Voltage
      3. 9.2.3  Voltage Feedback
        1. 9.2.3.1 Turns Ratio
      4. 9.2.4  Selecting the Switching Frequency and Primary Inductance
      5. 9.2.5  Primary Side Capacitor
      6. 9.2.6  Secondary Side Diode
      7. 9.2.7  Secondary Side Capacitor
      8. 9.2.8  Input Capacitor
      9. 9.2.9  Y - Capacitor
      10. 9.2.10 Slow Start Capacitor
      11. 9.2.11 Bootstrap Capacitor Selection
      12. 9.2.12 UVLO Resistors
      13. 9.2.13 Compensation
      14. 9.2.14 Design Tips
      15. 9.2.15 How to Specify a Fly-Buck Transformer
      16. 9.2.16 Application Curves
    3. 9.3 Typical Application, Dual Output
      1. 9.3.1 Design Guide Requirements
      2. 9.3.2 Detailed Design Procedures
        1. 9.3.2.1 Primary Side Voltage for Dual Output
        2. 9.3.2.2 Turns Ratio
        3. 9.3.2.3 Voltage Feedback
        4. 9.3.2.4 Selecting the Switching Frequency and Primary Inductance
          1. 9.3.2.4.1 Primary Side Capacitor
          2. 9.3.2.4.2 Secondary Side Diode
          3. 9.3.2.4.3 Secondary Side Capacitor
          4. 9.3.2.4.4 Input Capacitor
        5. 9.3.2.5 Compensation
        6. 9.3.2.6 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Isolated Fly-Buck™ Topology
  • Primary Side Feedback
  • 100 kHz to 2000 kHz Switching Frequency
  • Synchronizes to External Clock
  • Adjustable Slow Start
  • Adjustable Input Voltage UVLO
  • Open Drain Fault Output
  • Cycle-by-Cycle Current Limit
  • Thermal Shutdown Protection
  • 3 mm x 3 mm 16 Pin QFN Package

2 Applications

  • Noise Immunity in PLCs, Data Acquisition and Measurement Equipment
  • Isolated RS-232 and RS-485 Communication Channels
  • Powers Line Drivers, ISO Amplifiers, Sensors, CAN Transceivers
  • Floating Supplies for IGBT Gate Drivers
  • Promotes Safety in Medical Equipment

3 Description

The TPS55010 is a transformer driver designed to provide isolated power for isolated interfaces, such as RS-485 and RS-232, from 3.3 V or 5 V input supply.

The device uses fixed frequency current mode control and half bridge power stage with primary side feedback to regulate the output voltage for power levels up to 2W. The switching frequency is adjustable from 100 kHz to 2000 kHz so solution size, efficiency and noise can be optimized. The switching frequency is set with a resistor or is synchronized to external clock using the RT/CLK pin. To minimize inrush currents, a small capacitor can be connected to the SS pin. The EN pin can be used as an enable pin or to increase the default input UVLO voltage from 2.6V.

With the same transformer the TPS55010 can provide a solution for different input and output voltage combinations by adjusting the primary side voltage. Off the shelf transformers are available to provide single positive, or dual positive and negative output voltages.

The TPS55010 is available in a 3mm x 3mm 16 pin QFN package with thermal pad.

Device Information (1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS55010 WQFN (16) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at he end of the datasheet.

4 Simplified Schematic

TPS55010 frnt_page_circuit_slvsav0.gif

Efficiency vs Load Current

TPS55010 Efficiency_5V_FP_lvsav0.png