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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.

In Win Commander III 700wFigure 21: The +5VSB integrated circuit with an integrated switching transistor

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).

In Win Commander III 700wFigure 22: The +5VSB rectifier

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.