UCC24630

ACTIVE

Synchronous rectifier controller With Ultra Low Standby current

Product details

Operating temperature range (°C) -40 to 125 Control mode Volt-sec balance Topology CCM, DCM Rating Catalog Features 100uA standby current operation, 200 kHz operation, Compatible with CCM, Low standby current, Synchronous Rectifier, Volt-second balancing
Operating temperature range (°C) -40 to 125 Control mode Volt-sec balance Topology CCM, DCM Rating Catalog Features 100uA standby current operation, 200 kHz operation, Compatible with CCM, Low standby current, Synchronous Rectifier, Volt-second balancing
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • 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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Technical documentation

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Type Title Date
* Data sheet UCC24630 Synchronous Rectifier Controller With Ultra-Low-Standby Current datasheet (Rev. A) PDF | HTML 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 PDF | HTML 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.

User guide: PDF
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Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
UCC24630 Synchronous rectifier controller With Ultra Low Standby current
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Design guide: PDF
Schematic: PDF
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Schematic: PDF
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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 (...)
Schematic: PDF
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PMP11329 — Universal Line to 13 Volts at 4.6 Amps Power Supply Reference Design

Universal line to 13 volt at 60 watts power supply. This is a synchronous fly back operating in continuous conduction mode using TI's synchronous rectifier controller on the secondary.
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PMP10145 — 38W Offline AC/DC Transition Mode Synchronous Flyback Converter Reference Design

The PMP10145 reference design uses the UCC28610 flyback controller for the transition mode flyback topology. It generates an isolated output (9V@4.22A) from a wide AC input voltage range (80VAC - 291VAC). The controller maintains discontinuous mode operation and valley switching over the entire (...)
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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 (...)
Test report: PDF
Schematic: PDF
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