Product details

Topology CCM, DCM Frequency (Max) (kHz) 200 UVLO thresholds on/off (V) 4/3.6 Supply voltage (Max) (V) 28 Features Synchronous Rectifier, Compatible with CCM, Volt-second Balance on-time control, Low standby current Operating temperature range (C) -40 to 125
Topology CCM, DCM Frequency (Max) (kHz) 200 UVLO thresholds on/off (V) 4/3.6 Supply voltage (Max) (V) 28 Features Synchronous Rectifier, Compatible with CCM, Volt-second Balance on-time control, Low standby current Operating temperature range (C) -40 to 125
SOT-23 (DBV) 6 5 mm² 2.9 x 1.6
  • Secondary-Side SR Controller Optimized for 5-V to 24-V Flyback Systems
  • Operating Frequency Up to 200 kHz
  • Volt-Second Balance SR On-Time Control
  • Minimize Effect of MOSFET Device and Layout Inductance
  • CCM Operation Compatibility
  • Compatible with PSR and SSR Control
  • Auto Low-Power Detect and 110-µA Standby Mode Current
  • Wide VDD Range from 3.6 V to 28 V
  • Rail-to-Rail Gate Driver with 13-V Clamp
  • Open and Short Pin Fault Protection
  • Secondary-Side SR Controller Optimized for 5-V to 24-V Flyback Systems
  • Operating Frequency Up to 200 kHz
  • Volt-Second Balance SR On-Time Control
  • Minimize Effect of MOSFET Device and Layout Inductance
  • CCM Operation Compatibility
  • Compatible with PSR and SSR Control
  • Auto Low-Power Detect and 110-µA Standby Mode Current
  • Wide VDD Range from 3.6 V to 28 V
  • Rail-to-Rail Gate Driver with 13-V Clamp
  • Open and Short Pin Fault Protection

The UCC24630 SR controller is a high-performance controller and driver for N-channel MOSFET power devices used for secondary-side synchronous rectification.

The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also reduces primary-side losses as well, due to compounding of efficiency gains.

Utilizing a volt-second balancing control method, the UCC24630 is ideal for flyback power supplies over a wide-output voltage range since the device is not connected directly to the MOSFET drain. The SR drive turn-off threshold is not dependent on the MOSFET RDS(on) which allows optimizing for maximum conduction time. Also secondary current ringing due to device and layout inductance does not affect the SR turn-off threshold.

The UCC24630 controller offers a programmable false-trigger filter, a frequency detector to automatically switch to standby mode during low power conditions and pin fault protections. The UCC24630 is compatible with DCM, TM and CCM operation.

The wide VDD operating range, wide programming range of the VPC voltage and blanking time, allows use in a variety of flyback converter designs.

The UCC24630 SR controller is a high-performance controller and driver for N-channel MOSFET power devices used for secondary-side synchronous rectification.

The combination of controller and MOSFET emulates a near-ideal diode rectifier. This solution not only directly reduces power dissipation of the rectifier but also reduces primary-side losses as well, due to compounding of efficiency gains.

Utilizing a volt-second balancing control method, the UCC24630 is ideal for flyback power supplies over a wide-output voltage range since the device is not connected directly to the MOSFET drain. The SR drive turn-off threshold is not dependent on the MOSFET RDS(on) which allows optimizing for maximum conduction time. Also secondary current ringing due to device and layout inductance does not affect the SR turn-off threshold.

The UCC24630 controller offers a programmable false-trigger filter, a frequency detector to automatically switch to standby mode during low power conditions and pin fault protections. The UCC24630 is compatible with DCM, TM and CCM operation.

The wide VDD operating range, wide programming range of the VPC voltage and blanking time, allows use in a variety of flyback converter designs.

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UCC24636 ACTIVE Synchronous rectifier controller With Ultra-Low Standby current The UCC24636 cannot be used in CCM flyback designs

Technical documentation

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Type Title Date
* Data sheet UCC24630 Synchronous Rectifier Controller With Ultra-Low-Standby Current datasheet (Rev. A) 30 Mar 2015
Application note UCC24630 and UCC24636 SR-Control Configurations Guide 18 Dec 2017
EVM User's guide Using the UCC24630EVM-636 65-W AC-to-DC Adapter (Rev. B) 12 Dec 2016
Technical article Achieving low standby power and high efficiency in flyback converters 27 Jul 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

UCC24630EVM-636 — UCC24630 65W AC/DC Adapter

This is a high efficiency 65W AC/DC design using UCC24630 Synchronous Rectification Controller for a Universal input (85Vac to 265Vac) to 19.5V @3.33A output exceeding CoC-5 Tier2 and DOE Level VI performance requirements for external power supplies.

Calculation tool

UCC24630 Design Calculator (Rev. A)

SLUC582A.ZIP (69 KB)
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TIDA-00519 — 65W High-efficiency CoC-5 tier2/DOE Level VI AC Adapter

This is a high efficiency 65W AC/DC design for a Universal input (85Vac to 265Vac) to 19.5V @3.33A output exceeding CoC-5 Tier2 and DOE Level VI requirements for external power supplies using the LM5023 Quasi-Resontant Flyback Controller with UCC24630 Synchronous Rectification Controller and (...)
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The TIDA-00702 is a 60-W, industrial AC-DC power supply designed for use in industrial and instrumentation systems such as process controls, factory automation, and machinery control. This reference design is a Quasi-resonant (QR) flyback converter implemented using the UCC28740 CC-CV flyback (...)
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PMP11281 — Universal AC Input, 5V/10A/50W PSR Flyback Power Supply W/over 88% Avg Efficiency Reference Design

PMP11281 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller. The elimination of optocoupler using PSR topology promises higher reliability and lower system cost. The design achieves less than 40mW standby power losses and over 88% average (...)
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PMP10974 — Universal AC Input 5V/10A/50W PSR Flyback Power Supply With Over 89% Avg Efficiency Reference Design

PMP10974 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller. The elimination of optocoupler using PSR topology promises higher reliability and lower system cost. The design achieves less than 40mW standby power losses and over 89% average (...)
Reference designs

PMP10164 — Universal AC Input, 10.5V/1.8A DC Output, Isolated Synchronous Flyback Converter Reference Design

The PMP10164 reference design supplies 10.5V@1.8A from universal AC mains; the isolated Flyback topology is the most used for low power range due to single magnetic component. Since the load is a power line communication chip, a fixed frequency modulation has been chosen. The controller LM5021 (...)
Reference designs

PMP11216 — Synchronous Rectifier Controller Daughter Board Reference Design

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 (...)
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