Seasonic G-550 Power Supply Review
The +5VSB Power Supply
Contents
The +5VSB (a.k.a. standby) power supply is independent of the main power supply, since it is on continuously.
On the Seasonic G-550, the +5VSB power supply uses an ICE2QR1765 integrated circuit, which includes the PWM controller and the switching transistor in the same chip.
Figure 21: The +5VSB PWM controller with integrated switching transistor
The rectification of the +5VSB output is performed by an SBR10U45 Schottky rectifier, which supports up to 10 A (5 A per internal diode at 110° C, 0.57 V maximum voltage drop). This rectifier is located on the solder side of the printed circuit board.
Figure 22: The +5VSB rectifier