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 ICE2QR4765 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 SBR30A40CT Schottky rectifier, which supports up to 30 A (15 A per internal diode at 110° C, 0.50 V maximum voltage drop).