SRK2001

SRK2001 Datasheet Adaptive synchronous rectification controller for LLC resonant converter Features Secondary side synchronous rectification controller optimized for LLC resonant converter Dual gate driver for N-channel MOSFET Adaptive turn-off logic Turn-on logic with adaptive masking time Auto-compensation of parasitic inductance Low consumption mode: 50 A quiescent current V operating voltage range 4.5 V to 32 V CC High voltage drain-to-source Kelvin sensing for each SR MOSFET 35 ns total delay at turn-off Protection against current reversal Safe management of load transient, light-load and startup conditions Intelligent automatic sleep mode at light-load with user programmable enter/exit load levels, with soft transitions and function disable Programmable exit load levels from burst mode Compatible with standard level MOSFET SSOP10 package Applications AC-DC adapters Product status link All-in-one PC SRK2001 High-end flat panel TV 80+/85+ compliant ATX SMPS Product summary 90+/92+ compliant SERVER SMPS Order code SRK2001 SRK2001TR Industrial SMPS Package SSOP10 Packing Tube Tape & Reel Description Product label The SRK2001 controller implements a control scheme specific for secondary side synchronous rectification in LLC resonant converters that use a transformer with center tap secondary winding for full wave rectification. It provides two high current gate drive outputs, each capable of directly driving one or more N-channel power MOSFET. Each gate driver is controlled separately and an interlock logic circuit prevents the two synchronous rectifier MOSFET from conducting simultaneously. The control scheme ensures that each synchronous rectifier is switched ON as the corresponding half-winding starts conducting and OFF as its current falls to zero. The turn-on logic with adaptive masking time and adaptive turn-off logic allow maximizing the conduction time of the SR MOSFET, eliminating the need for a parasitic inductance compensation circuit. The low consumption mode of the device allows meeting the most stringent requirements for converter power consumption in light-load and no-load conditions. A very low external component count is required when using this device. DS10811 - Rev 6 - September 2021 www.st.com For further information contact your local STMicroelectronics sales office.SRK2001 Block diagrams 1 Block diagrams Figure 1. Internal block diagram DVS1 UVLO VCC HV SVS1 CLAMP POWER and MANAGEMENT V BUS SWITCH GND DVS2 SVS2 TIMERS COMPARATORS ON ZCD OFF EN ADC ADAPTIVE ADAPTIVE PROG ON-TIME OFF-TIME CK CONTROL LOGIC DRIVER DRIVER GD2 GD1 Figure 2. Typical system block diagram PFC PRE-REGULATOR(OPTIONAL) LLC RESONANT HALF-BRIDGE WITH SYNCH RECTIFIER V OUT V INac L6562A L6599A SRK2001 L6563/S/H L6699 DS10811 - Rev 6 page 2/23