The +5VSB Power Supply
The +5VSB (a.k.a. standby) power supply is independent of the main power supply, since it is on continuously.
The +5VSB power supply uses an STR-A6069H integrated circuit, which incorporates the PWM controller and the switching transistor into a single chip.
The rectification of the +5VSB output is performed by an STPS2045CT Schottky rectifier, which supports up to 20 A (10 A per internal diode at 155° C, 0.84 V maximum voltage drop).