Product details

Topology CCM, DCM Frequency (Max) (kHz) 130 UVLO thresholds on/off (V) 4/3.6 Supply voltage (Max) (V) 28 Features Synchronous Rectifier, Volt-second balancing, Auto-detect standby mode, 100uA standby current operation Operating temperature range (C) -40 to 125
Topology CCM, DCM Frequency (Max) (kHz) 130 UVLO thresholds on/off (V) 4/3.6 Supply voltage (Max) (V) 28 Features Synchronous Rectifier, Volt-second balancing, Auto-detect standby mode, 100uA standby current operation 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 Output Discontinuous/Transition Mode
    Only Flyback Converters
  • Volt-Second Balance Control Enables Highest
    Rectifier Efficiency
  • Compatible with PSR and SSR Flyback
    Controllers
  • Ultra Low 110-µA Standby Current Consumption
  • Auto-Detect Standby Mode Disables SR Switching
    for Lower No-Load
    Power Consumption
  • SR Turn-Off Independent of RDSON and Parasitic
    Inductance
  • Operating Frequency Up to 130 kHz
  • Wide VDD Range from 3.6 V to 28 V
  • Adaptive Gate Drive Clamp
  • Open and Short Pin Fault Protection
  • Secondary-Side SR Controller Optimized for
    5-V to 24-V Output Discontinuous/Transition Mode
    Only Flyback Converters
  • Volt-Second Balance Control Enables Highest
    Rectifier Efficiency
  • Compatible with PSR and SSR Flyback
    Controllers
  • Ultra Low 110-µA Standby Current Consumption
  • Auto-Detect Standby Mode Disables SR Switching
    for Lower No-Load
    Power Consumption
  • SR Turn-Off Independent of RDSON and Parasitic
    Inductance
  • Operating Frequency Up to 130 kHz
  • Wide VDD Range from 3.6 V to 28 V
  • Adaptive Gate Drive Clamp
  • Open and Short Pin Fault Protection

The UCC24636 SR is a compact, 6-pin secondary-side synchronous rectifier MOSFET controller and driver for high efficiency Flyback converters operating in Discontinuous (DCM) and Transition mode (TM). Unlike traditional SR controllers which measure the SR MOSFET drain voltage, UCC24636 implements a volt-second balance control method to determine the turn off transition of the SR MOSFET; hence, SR conduction time is independent of the MOSFET RDSON, parasitic inductance or ringing allowing flexibility to designers in component slelction and PCB layout. This control method enables maximum SR conduction time and highest rectifier efficiency for a given MOSFET.

The controller has built in intelligence to detect converter no load operation and automatically enters standby mode. While in standby mode, it disables the SR MOSFET and lowers its bias supply current to 110µA to further reduce overall system standby power consumption. The wide VDD operating range for the controller allows direct bias from the converter output for fixed or variable output voltage designs. This eliminates the need for an auxilliary winding on the main transformer, which simplifies the circuit design and reduces the cost.

The UCC24636 SR is a compact, 6-pin secondary-side synchronous rectifier MOSFET controller and driver for high efficiency Flyback converters operating in Discontinuous (DCM) and Transition mode (TM). Unlike traditional SR controllers which measure the SR MOSFET drain voltage, UCC24636 implements a volt-second balance control method to determine the turn off transition of the SR MOSFET; hence, SR conduction time is independent of the MOSFET RDSON, parasitic inductance or ringing allowing flexibility to designers in component slelction and PCB layout. This control method enables maximum SR conduction time and highest rectifier efficiency for a given MOSFET.

The controller has built in intelligence to detect converter no load operation and automatically enters standby mode. While in standby mode, it disables the SR MOSFET and lowers its bias supply current to 110µA to further reduce overall system standby power consumption. The wide VDD operating range for the controller allows direct bias from the converter output for fixed or variable output voltage designs. This eliminates the need for an auxilliary winding on the main transformer, which simplifies the circuit design and reduces the cost.

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Technical documentation

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Type Title Date
* Data sheet UCC24636 Synchronous Rectifier (SR) Controller With Ultra-Low Standby Current datasheet (Rev. A) 11 Mar 2016
Application note UCC24630 and UCC24636 SR-Control Configurations Guide 18 Dec 2017
Application note Design UCC28704 With UCC24636 (PSR+SR) 12 Jan 2017
Technical article Biasing an SR controller IC in USB smartphone charging applications 08 Dec 2016
Technical article USB chargers then and now: Type-C meets energy efficiency standards 23 Sep 2016
Analog design journal Agency requirements for stand-by power consumption w/ offline and PoL converters 26 Jan 2016
User guide Using the UCC24636EVM 08 Jan 2016

Design & development

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Daughter card

UCC24636EVM — UCC24636 Synchronous Rectifier Daughter Board/Evaluation Module

The UCC24636EVM is a demonstration daughter board that allows quick installation into an existing DCM Flyback power supply to convert an output diode rectifier into a synchronous rectifier to improve efficiency. The board is programmed by the user and may be wired directly into the output stage, (...)
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