SRK2000

DataSheet.in SRK2000 Synchronous rectifier smart driver for LLC resonant converter Preliminary data Features ■ ■ ■ ■ ■ ■ ■ ■ ■ Secondary-side synchronous rectifier controller optimized for LLC resonant converter Safe management of load transient, light load and start-up condition 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 SO8 package SO-8 switched off as its current goes to zero. A unique feature of this IC is its intelligent automatic sleep mode. It allows the detection of a low-power operating condition for the converter and puts the IC in a low consumption sleep-mode where gate driving is stopped and quiescent consumption is reduced. In this way, converter's efficiency improves at light load, where synchronous rectification is no more beneficial. The IC automatically exits from sleep-mode and restarts switching as it recognizes that the load for the converter has increased. A noticeable feature is the very low external component count required. Figure 1. Internal block diagram 6## Applications ■ ■ ■ ■ ■ All-in-one PC High-power AC-DC adapters 80+/85+ compliant ATX SMPS 90+/92+ compliant server SMPS Industrial SMPS 6 56,/ 6 56,/ 6 2EGULATOR 6 Description The SRK2000 smart driver implements a control scheme specific for secondary-side ...