Chapter 2 69
Block Diagrams
A6 Power Supply Assembly
A6 Power Supply Assembly
The A6 power supply assembly is a switching power supply operating at
121.95 kHz switching frequency. The input power ranges for the power
supply are 90 to 132 V or 195 to 250 Vrms. The power supply
automatically senses the input power and switches between these two
ranges. The output voltages are: +5.2 V, −5 .2 V, +9 V, +15 V, −15 V,
+32 V, VCC (5.2 V for processor) and VDL (3.3 V to processor). A low
TTL level on the PS_off_L line turns off the power supply and places it
in standby mode. In standby mode, the front panel standby LED is
powered on by the P15SBY line from the power supply.
When the power supply is on, the “power on” front panel LED is
powered by the 5.2 V supply. The power supply plugs directly into the
motherboard.
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