SR & load share controllers

Improve your efficiency and power density with our high-performance synchronous rectifier and load-share controllers

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Our portfolio of high-performance synchronous rectifier and load-share controllers enables higher efficiency for power supplies by replacing the output rectifier diode with a more efficient synchronous rectifier field-effect transistor. This topology helps you create solutions that are smaller, cooler and compliant with stringent requirements.

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Synchronous rectification

Our synchronous rectification controllers enhance the efficiency of an AC/DC power supply by replacing the rectification diodes with actively controlled MOSFETs on the secondary side.

Load share        

Get enhanced system reliability through redundancy; where it's possible to tolerate the failure of one or more modules as long as the remaining capacity is equal to or greater than the load demand.

Primary-side startup

Our primary-side startup devices support a fast transient response with one-sixth of the capacitance at the output.

Technical resources

Video
Video
Control & design challenges for SR controllers
This training series explains the benefits of using a synchronous rectifier to achieve efficiency improvements and presents design criteria for selecting a suitable SR MOSFET.
Application note
Application note
Design Considerations With Dual-Channel SR Controller UCC24624
This application note provides helpful tips and design considerations when using our latest SR controller for LLC resonant converter applications.
document-pdfAcrobat PDF
More literature
More literature
Achieving High Power Density and Ultra Low Standby Power in Flyback Converters
This seminar offers a review of how our newest wake-up IC, UCC24650, improves transient response in a PSR flyback supply while reducing output capacitance and still maintaining excellent standby power.
document-pdfAcrobat PDF

Discover featured applications

Power delivery
Increase efficiency while reducing standby power with our synchronous rectifier and wake-up controllers
Appliances: battery charger
Efficiently and safely deliver power with a portable battery charger using our synchronous rectifier and wake-up controllers
Telecom & server power
Maximize efficiency in power-supply units (PSUs) in server and telecommunication equipment with our synchronous rectifier and wake-up controllers

Increase efficiency while reducing standby power with our synchronous rectifier and wake-up controllers

Consumers are demanding smaller and faster chargers and adapters for portability and convenience. Adapters also need to deliver more power with the same or less size, without violating regulatory standards.

Benefits:

  • Compatible with flyback and inductor-inductor-capacitor (LLC) topologies (including multimode) to boost efficiency by replacing lossy rectifier diodes.
  • Light-load management and low standby current.
  • A wide drain-voltage range for direct biasing reduces bill of materials.
  • High-side or low-side configurable for flexibility with integrated drivers and clamps.

Featured resources

REFERENCE DESIGNS
  • PMP11232 – Universal AC Input 5V/6A/30W PSR Flyback Power Supply Reference Design w/Over 89.5% Avg Efficiency
  • PMP11451 – USB-IF Certified USB Type-C™ DFP 20V/3A/60W Out, Universal AC Input Reference Design
  • PMP22244 – 60-W USB Type-C® high-density active clamp flyback with GaN reference design
PRODUCTS
  • UCC24650 – 200-V wake-up monitor for fast transient primary-side regulation
HARDWARE DEVELOPMENT
  • PFCLLCSREVM034 – AC to isolated DC EVM with UCC28056B, UCC256404 and UCC24624
  • UCC28730EVM-552 – UCC28730 Primary Side Flyback Controller with UCC24650 Secondary Side Wake Up

Efficiently and safely deliver power with a portable battery charger using our synchronous rectifier and wake-up controllers

Our synchronous rectifier and wake-up controllers reduce losses on key parts of the board while reducing standby power.

Benefits:

  • Minimal losses and higher efficiency – as higher as 5% in some cases.
  • Compatibility with common flyback and inductor-inductor-capacitor topologies, regardless of operating mode.
  • Improved standby power and light-load efficiency in systems lacking a power-factor-correction front end.

Featured resources

END-EQUIPMENT / SUB-SYSTEM
REFERENCE DESIGNS
  • PMP15002 – Universal AC Input to 5V/3A Output Reference Design DOE6 and COC V5 Tier 2 Compliant
PRODUCTS
  • UCC24612 – High-frequency multi-mode synchronous rectifier controller
HARDWARE DEVELOPMENT
  • UCC24612-1EVM – Secondary-side synchronous rectifier controller diode-replacement demonstration board

Maximize efficiency in power-supply units (PSUs) in server and telecommunication equipment with our synchronous rectifier and wake-up controllers

A PSU needs to deliver more power without compromising performance. Our synchronous rectifier and load-share controllers facilitate high reliability and decreased thermal stress.

Benefits:

  • Compliance with the Intel server system infrastructure specification enables enhanced system reliability by leveraging the capacity of multiple sources to deliver power to the load.
  • A wide drain voltage range for direct biasing reduces bill of materials and increases design flexibility.
  • Many packages and temperature ratings, as well as remote-sensing capability.

Featured resources

REFERENCE DESIGNS
  • PMP23146 – 45-W high-power-density active clamp flyback with GaN reference design for server auxiliary power
  • PMP22087 – 336-W Auxless AC/DC power supply reference design with 80 PLUS platinum compatible performance
PRODUCTS
  • UCC24624 – High-frequency, dual synchronous rectifier controller for LLC converters
  • UCC39002 – Advanced 8 pin load share controller, 0°C to 70°C
  • UCC24612 – High-frequency multi-mode synchronous rectifier controller
HARDWARE DEVELOPMENT
  • UCC39002EVM – UCC39002 Evaluation Module
  • UCC24610EVM-693 – Diode Replacement Demonstration Card for UCC24610 Secondary Side Synchronous Rectifier Controller
TECHNICAL RESOURCES

Design & development resources

Reference design
USB Type-C™ DFP 15V/3A/45W Out, Universal AC Input Reference Design

The PMP20533 power reference design provides up to 15 V/45 W over USB Type-C from a universal AC input range of 85 to 265 VAC for charger applications. The UCC24636 synchronous rectifier driver allows this design to provide 91% average efficiency.  The TPS25740A provides the interface between (...)

Reference design
Reverse Power Supply - Eight Inputs One Output Reference Design

This reference design is a power solution for reverse-powered telecom applications. Up to eight isolated inputs provide one common output; the load is shared equally between all active converters.

Reference design
Universal AC Input, 5V/10A/50W PSR Flyback Power Supply W/Rapid Load Transient Response Ref Design

PMP10407 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller demonstrating the use of wake up device UCC24650 to achieve rapid load transient response from light load condition when the system is under low frequency operation. The elimination of (...)

Reference designs related to SR & load share controllers

Use our reference design selection tool to find designs that best match your application and parameters.