UCC24624 Series

High-frequency, dual synchronous rectifier controller for LLC converters

Catalog

High-frequency, dual synchronous rectifier controller for LLC converters

Part	Channel Type	Gate Type	Supplier Device Package	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Package / Case [y]	Package / Case [x]	Number of Drivers	Rise / Fall Time (Typ) [custom]	Rise / Fall Time (Typ) [custom]	Driven Configuration	Input Type	Current - Peak Output (Source, Sink)	Utilized IC / Part	Contents	Secondary Attributes	Function	Supplied Contents	Type
Texas Instruments UCC24624DT	Independent	N-Channel MOSFET	8-SOIC	4.25 V	26 V	Surface Mount	-40 °C	125 ¯C	8-SOIC	3.9 mm	0.154 in	2	23 ns	19 ns	Low-Side	Non-Inverting	1.5 A 4 A
Texas Instruments UCC24624DR	Independent	N-Channel MOSFET	8-SOIC	4.25 V	26 V	Surface Mount	-40 °C	125 ¯C	8-SOIC	3.9 mm	0.154 in	2	23 ns	19 ns	Low-Side	Non-Inverting	1.5 A 4 A
Texas Instruments UCC24624EVM-015																		UCC24624	Board(s)	On-Board Test Points	Gate Driver	Board(s)	Power Management

Catalog

High-frequency, dual synchronous rectifier controller for LLC converters

Key Features

• 230-V VD pins rating23-ns turn-off delay to support LLC operating above resonant frequency and up to 625-kHz switching frequencyProportional gate drive to extend the SR conduction timeAdjustable turn-off threshold for minimum body diode conductionAutomatic standby mode detection with 180 µA of low standby currentWide 4.25-V to 26-V VDD operation range with internal clampAdaptive turn-on delay for better DCM ring rejectionTwo-channel interlock to prevent shoot-throughIntegrated 1.5-A source and 4-A sink capability gate driver for N-channel MOSFETs8-pin SOIC package230-V VD pins rating23-ns turn-off delay to support LLC operating above resonant frequency and up to 625-kHz switching frequencyProportional gate drive to extend the SR conduction timeAdjustable turn-off threshold for minimum body diode conductionAutomatic standby mode detection with 180 µA of low standby currentWide 4.25-V to 26-V VDD operation range with internal clampAdaptive turn-on delay for better DCM ring rejectionTwo-channel interlock to prevent shoot-throughIntegrated 1.5-A source and 4-A sink capability gate driver for N-channel MOSFETs8-pin SOIC package

Description

The UCC24624 high-performance synchronous rectifier (SR) controller is dedicated forLLC resonant convertersto 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. space The UCC24624 high-performance synchronous rectifier (SR) controller is dedicated forLLC resonant convertersto 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. space