SLVSF07 July 2021 TPS7H5001-SP
In applications where synchronous rectification (SR) is desired in order to increase overall efficiency, SRA and SRB can be utilized to provide control signals for the SR switches. Also, in an active clamp topology where OUTA is used to control the main FET, SRA can be utilized to control the clamping FET. Similar to the primary switching outputs, the peak current capability is roughly 150 mA and an external gate drive solution is required. SRB is only active when the duty cycle limit is set to 50% connecting the DCL pin to AVSS. The synchronous rectifier outputs are off during the soft-start period and start switching when the voltage on SS exceeds 1 V. A small voltage transient may appear on the converter output at the moment when the synchronous rectifier outputs start switching.