Description

The SRK2000A smart driver implements a control scheme specific to 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 driving one or more N-channel Power MOSFETs. Each gate driver is controlled separately and an interlocking logic circuit prevents the two synchronous rectifier MOSFETs from conducting simultaneously.

Features

• Secondary side synchronous rectifier controller optimized for LLC resonant converters

• Protection against current reversal

• Safe management of load transient, light load and startup condition

• Matched turn-off thresholds

• Intelligent automatic sleep mode at light load

• Dual gate driver for N-channel MOSFETs with 1 A source and 3.5 A sink drive current

• Operating voltage range 4.5 to 32 V

• Programmable UVLO with hysteresis

• 250 µA quiescent consumption

• Operating frequency up to 500 kHz

• Available in SO-8 package

Applications

• All-in-one PC

• High-power AC-DC adapters

• 80+/85+ compliant ATX SMPS

• 90+/92+ compliant server SMPS

• Industrial SMPS