FSP Aurum 92+ 650 W 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 FSP Aurum 92+ 650 W, the +5VSB power supply uses an AP03N70I-H as its switching transistor, which supports up to 2.5 A at 25° C or 1.6 A at 100° C in continuous mode, or up to 8 A at 25° C in pulse mode, with a maximum RDS(on) of only 4.4 mΩ.
Figure 21: The +5VSB switching transistor
The switching transistor is controlled by the same FSP6600 integrated circuit that controls the switching transistors of the main power supply.
The rectification of the +5VSB output is performed by an STPS20L60CT Schottky rectifier, which supports up to 20 A (10 A per internal diode at 140° C, 0.74 V maximum voltage drop).
Figure 22: The +5VSB rectifier