High frequency Dual synchronous rectifier controller for LLC Converter


Product details


Frequency (Max) (kHz) 700 UVLO thresholds on/off (V) 4.5/4 Features Proportional gate drive Operating temperature range (C) -40 to 125 open-in-new Find other Synchronous rectifier (SR) controllers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other Synchronous rectifier (SR) controllers


  • 230-V VD Pins Rating
  • 23-ns Turn-Off Delay to Support LLC Operating Above Resonant Frequency and Up to 625-kHz Switching Frequency
  • Proportional Gate Drive to Extend the SR Conduction Time
  • Adjustable Turn-Off Threshold for Minimum Body Diode Conduction
  • Automatic Standby Mode Detection With 180 µA of Low Standby Current
  • Wide 4.25-V to 26-V VDD Operation Range With Internal Clamp
  • Adaptive Turn-on Delay for Better DCM Ring Rejection
  • Two-Channel Interlock to Prevent Shoot-Through
  • Integrated 1.5-A Source and 4-A Sink Capability Gate Driver for N-Channel MOSFETs
  • 8-Pin SOIC Package

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The UCC24624 high-performance synchronous rectifier (SR) controller is dedicated for LLC resonant converters to replace the lossy diode output rectifiers with SR MOSFETs and improve the overall system efficiency.

The UCC24624 SR controller uses drain-to-source voltage sensing method to achieve on and off control of the SR MOSFET. Proportional gate drive is implemented to extend the SR conduction time, minimize the body diode conduction time. To compensate for the offset voltage caused by the SR MOSFET parasitic inductance, the UCC24624 implements an adjustable positive turn-off threshold to accommodate different SR MOSFET packages. UCC24624 has a built-in 475-ns on-time blanking and a fixed 650-ns off-time blanking to avoid SR false turn-on and turn-off. UCC24624 also integrates a two-channel interlock function that prevents the two SRs from being on at the same time. With 230-V voltage-sensing pins and 28-V ABS maximum VDD rating, it can be directly used in converters with output voltage up to 24.75 V. The internal clamp allows the controller to support 36-V output voltage easily by adding an external current limiting resistor on VDD.

With the built-in standby mode detection based on average switching frequency, UCC24624 enters the standby mode automatically without using external components. The low standby mode current of 180 µA supports meeting modern no-load power consumption requirements such as CoC, and DoE regulations. UCC24624 can be used with the UCC25630x LLC and UCC28056 PFC controllers to achieve high efficiency while maintaining excellent light load and no-load performances. Other PFC controllers, such as UCC28064A, UCC28180, and UCC28070 can be used to achieve higher power levels. 1.5-A peak source and 4-A peak sink driving capability allows UCC24624 to support LLC converters up to 1 kW.

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Technical documentation

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Type Title Date
* Datasheet UCC24624 Dual-Channel Synchronous Rectifier Controller for LLC Resonant Converters datasheet (Rev. B) Nov. 28, 2018
Application notes Design Considerations With Dual-Channel SR Controller UCC24624 Jun. 04, 2020
Technical articles How to reduce audible noise and power consumption at standby in your AC/DC design Apr. 22, 2020
User guides PFCLLCSREVM-034 User Guide Jul. 26, 2019
Technical articles Three considerations for achieving high efficiency and reliability in industrial AC/DC power supplies Apr. 04, 2019
User guides The UCC24624EVM-015 LLC Gate Driver Evaluation Module (Rev. A) Dec. 04, 2018
Application notes Improving ZVS and efficiency in LLC converters Nov. 05, 2018
Application notes Boosting LLC Resonant Converter Efficiency by Using the UCC24624 Oct. 23, 2018

Design & development

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

Hardware development

document-generic User guide

PFCLLCSREVM034 is a 168-W AC/DC supply with a transition-mode power-factor-correction front end and isolated half-bridge LLC resonant converter with synchronous rectification. This EVM accepts AC input from 90 Vrms to 264 Vrms and outputs 12-V DC with 168-W full-load output power.

  • Low cost single layer PCB
  • High efficiency meeting CoC Tier II
  • Excellent no load to full load transient response
  • X capacitor discharge function
document-generic User guide
The UCC24624EVM-015 evaluation module (EVM) is used to convert the output rectifier of a LLC converter from diodes to synchronous rectifiers (SR) FETs to investigate and evaluate the efficiency benefits of using an SR over a rectifier diode.
  • Dual channel Synchronous Rectifier (SR) driver with 230V VD rating
  • Fast turnoff delay to support high frequency operation
  • Proportional gate drive to extend the SR conduction time
  • 30 mV turn off threshold for minimum body diode conduction
  • Fixed minimum on and off time to support 700 kHz switching (...)

Design tools & simulation

SLUM645A.ZIP (1115 KB) - SIMPLIS Model

Reference designs

>95% Efficiency, 1-kW analog control AC/DC reference design for 5G telecom rectifier
TIDA-010081 — This compact, high efficiency reference design with a 54-V DC, 1000-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC stage (...)
document-generic Schematic document-generic User guide
94% Peak efficiency, 150W norm, 240W peak industrial AC/DC power supply with CC/CV reference design
TIDA-010038 — This compact, high efficiency, 24V DC, 150W nominal, 240W peak output at 230VAC reference design is targeted for industrial AC/DC power supplies. The circuit consists of a frontend transition mode (TrM) power factor correction(PFC) circuit based on the UCC28056, followed by a robust LLC stage for an (...)
document-generic Schematic document-generic User guide
48-V/550-W resonant converter reference design
PMP21683 — This resonant converter reference design takes a 380-V to 420-V DC input and generates a 48-V up to 550-W output. With the UCC256302 driver-integrated resonant converter controller and UCC24624, a two-channel synchronous rectifier (SR) driver, this design can achieve 97.95% peak efficiency.
document-generic Schematic document-generic User guide

CAD/CAE symbols

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SOIC (D) 8 View options

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