Synchronous Rectifier Controller Daughter Board Reference Design
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Key Document


The UCC24630 SR controller is a high performance controller and driver for N-channel MOSFET power devices used in secondary side synchronous rectification. Using a volt-second balance control method, the UCC24630 is ideal for flyback power supplies over a wide output voltage range since the IC is not directly connected to the MOSFET drain. The SR drive turn off threshold is not depenant on the MOSFET RDSON which allows optimizing for maximum conduction time.

  • Optimized for 5V to 24V Flyback Systems
  • Wide VDD range from 3.6V to 28V
  • Volt-Second Balance SR On Time Control
  • Minimize Effect of MOSFET and Layout Inductance
  • CCM Operation Compatibility
  • Auto Low Power Detect and 110uA Standby Mode Current

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)90
Vin (Max) (V)264
Vout (Nom) (V)20
Iout (Max) (A)3.4
Output Power (W)68
Input TypeAC
TopologyFlyback- DCM

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19531Q5A  100V, N ch NexFET MOSFETâ„¢, single SON5x6, 6.4mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
UCC24630  Synchronous rectifier controller With Ultra Low Standby current  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD19531Q5A VSONP (DQJ)| 8 Download
UCC24630 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 633 19 Jun 2015
Design files (5)
Title Type Size (KB) Date
PDF 177 19 Jun 2015
PDF 119 19 Jun 2015
PDF 46 19 Jun 2015
ZIP 170 19 Jun 2015
PDF 22 19 Jun 2015

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