UCC24636

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Synchronous rectifier controller With Ultra-Low Standby current

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Product details

Parameters

Frequency (Max) (kHz) 130 UVLO thresholds on/off (V) 4/3.6 Features USB Type-C Compatible Operating temperature range (C) -40 to 125 open-in-new Find other Synchronous rectifier (SR) controllers

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Synchronous rectifier (SR) controllers

Features

  • 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
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Description

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

Design & development

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

Hardware development

DAUGHTER CARDS Download
document-generic User guide
$49.00
Description
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 (...)
Features
  • Board includes UCC24636 and SR MOSFET
  • Retrofit in 5V or 12V DCM Flyback converter designs
  • SR MOSFET CSD19531 100V/5.3mΩ
  • User-programmable for 5-V to 12-V outputs

Design tools & simulation

CALCULATION TOOLS Download
SLUC604A.ZIP (55 KB)

Reference designs

REFERENCE DESIGNS Download
36W, Universal Input, >90% Efficiency, Dual Output Aux Supply Ref Design for PSU
TIDA-00709 — The TIDA-00709 is a 36-W, dual output, auxiliary power supply with provision to accept both wide ranges of DC as well as AC input. Based on the input, this TI Design can be used as an adapter or auxiliary power supply designed for use in power converters targeted for server, telecom, and industrial (...)
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REFERENCE DESIGNS Download
40-V to 180-V DC input, 24-V 2-A output half brick power module reference design
PMP40376 — This reference design is an auxiliary power supply with 24-V, 2-A output. The line and load regulation of the power supply is designed to be within 1% using secondary side regulator UCC28740. All components are on the toplayer and the size is the industrial standard half-brick dimension.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB Type-C™ DFP 15V/3A/45W Out, Universal AC Input Reference Design
PMP20533 — 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 (...)
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REFERENCE DESIGNS Download
45W USB Type-C™ PD DFP Adapter Reference Design for Fast Charge UFP Applications
PMP40183 — The PMP40183 reference design is a fast charger solution with secondary-side regulation using UCC28740 which provides Constant-Voltage Constant-Current. The design supports maximum 15V/3A PD 3.0 standard and also 6.2V-11V/4A output power level. This output performance will enable fast charge between (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
5.5V/11A Out Synchronous Flyback, Universal AC Input Reference Design
PMP11371 — The PMP11371 power reference design provides up to 60W at 5.5V from a universal AC input range of 85-265VAC.  The UCC24636 synchronous rectifier driver allows this design to provide 88% average efficiency in a compact form factor.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
400V Input, 50W Output Multiple-Output Bias Supply Reference Design
PMP20396 — PMP20396 is a multiple-output isolated bias supply reference design. With 100V or above input voltage, this design can provide maximum 2W output power. With 300V or above input voltage, this design can provide maximum 50W output power. Four different outputs are provided in this design - 5V/500mA (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
100V to 410V DC Input to 12V/4.5A Output Bias Supply Reference Design
PMP20432 — PMP20432 is an isolated bias supply reference design. With 100V or above input voltage, this design can provide maximum 2W output power. With 300V or above input voltage, this design can provide maximum 52W output power with 12V regulated output voltage. Peak 91.5% efficiency is achieved in this (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
120VAC Input, PSR 5V 25W Flyback Reference Design
PMP20771 — This reference design is a 120Vac to 5V primary side regulated flyback converter with synchronous rectification on the secondary side.  The reference design has extremely low standby power at 67mW.  UCC28704 features integrated CC-CV regulation without the use of an optocoupler. PMP20771 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
120VAC Input, 93.2% Efficient 17V 39W Flyback Reference Design
PMP11372 — This reference design is a 120Vac to 17V flyback converter with synchronous rectification on the secondary side. The lossless passive clamp on the primary side helps this reference design achieve efficiency over 93% at maximum load.  When combined with PMP20172 this reference design makes a (...)
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REFERENCE DESIGNS Download
5V/20W PSR Flyback with CCCV Regulation and Cable Compensation Reference Design
PMP11500 — This reference design is a 120Vac to 5V primary side regulated flyback converter with synchronous rectification on the secondary side. PMP11500 has built in cable compensation  which adjusts the regulation set point to offset the resistance in long cables. The reference design has extremely low (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85 to 265VAC Input 5V@4.8A Dual Port USB Charger Reference Design
PMP10885 The PMP10885 reference design is capable of charging two devices simultaneously at 2.4A each. The UCC24636 synchronous rectifier controller and CSD18531Q5A FET reduce the rectifier loss and provide high efficiency with a minimal increase in cost.  The TPS2559 provides accurate and independent (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Fast Charge Adapter Solution with 3.5-5.5V 7A Output Reference Design
PMP40060 The PMP40060 is a fast charger solution with secondary-side regulation UCC28740DR which provides Constant-Voltage Constant-Current feature. The design supports 3.5V 7A lower output voltage closely to battery voltage and also 5.5V 7A output power level. This output performance will enable direct (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB Type-C PD DFP Charger 5V/12V3A Out Adapter Reference Design
PMP4489 — The PMP4489 reference design is a dedicated USB-C PD2.0 DFP 5V/12V3A output flyback converter with secondary-side regulation UCC28740DR which provides Constant-Voltage Constant-Current feature. The design features <75mW standby power(compliant with DOE 6 &CoC V5 Tier 2 standard (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input to 5V/3A Output Reference Design DOE6 and COC V5 Tier 2 Compliant
PMP15002 — The PMP15002 is a highly efficient, universal AC input to 5V 3A output reference design for cost-optimized adapter and charger applications. The topology is primary-side regulated quasi resonant flyback with synchronous rectification.  With the use of primary-side regulation, it eliminates the (...)
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REFERENCE DESIGNS Download
High Efficiency Universal AC Input to 5V 2A Adapter Reference Design
PMP11600 — The PMP11600 is a reference design for 5V 2A adapter applications. The solution implements a high efficiency primary side controller UCC28704, it is fully tested and passes conduction EMI. This design uses Volt-Second balance control synchronous rectifier UCC24636 for high efficiency. The board (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input to 5V 3A Output Reference Design DOE6 and CoC V5 Tier 2 Compliant
PMP4466 — The PMP4466 is an AC input to 5V 3A output reference design for high current charger applications, such as USB Type-C. The topology is Synchronous Rectified valley switched DCM Flyback which uses the UCC28740 and UCC24636. Good regulation and dynamic performance is achieved by using the secondary (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB Type-C DFP Charger 5V3A SSR Control Adapter Reference Design
PMP4403 — The PMP4403 is an AC in 5V 3A reference design for USB Type-C™ DFP charger applications. It also is compliant with BC 1.2 devices. The solution is a synchronous rectified QR flyback which uses the UCC28740 and UCC24636. Good regulation and dynamic performance is achieved by using a secondary (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB-IF Certified USB Type-C™ DFP 20V/3A/60W Out, Universal AC Input Reference Design
PMP11451 This power reference design provides up to 20 V/60 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. A daughter card provides the PD port control over the USB (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Light-Load Efficient 120VAC Input, 25W/5VDC Reference Design with 4 POL Outputs
PMP11180 This 25-W design uses the UCC28740 in a flyback topology to minimize no-load standby power and the UCC24636 synchronous rectifier controller to minimize power MOSFET body-diode conduction times. The design also features point-of-load converters from the main 5V rail that implement an energy-saving (...)
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REFERENCE DESIGNS Download
USB-C DFP, 5V/3A Out, Universal AC Input Reference Design
PMP11295 — This power reference design provides 5V/15W over USB-C from a universal AC input range of 85-265VAC. The UCC24636 synchronous rectifer driver and CSD18540Q5B MOSFET allow this design to provide 84% average efficiency. The TPS25810 provides the PD port control over the USB-C output connector.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
120VAC Input, High Efficiency 12V/50W Power Supply Reference Design
PMP11368 The PMP11368 power reference design provides 50W of load power from a standard 120VAC input with greater than 90% efficiency.  The UCC27714 integrates the drive for the high-side MOSFET, while the UCC24636 drives the synchronous rectifer.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85-265VAC Input, 12V/30W Two-Switch Flyback Reference Design
PMP10936 The PMP10936 reference design uses the UCC28740 to provide an isolated 12V at 2.5A output.  The UCC24636 is used to control a synchronous recitifer for high efficiency.  The two-switch flyback topology recycles the transformer's leakage energy and provides a further improvement in efficiency.
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SOT-23 (DBV) 6 View options

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Videos

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