Draw pin diagram of ATX power supply. Give specifications of each pin.

Draw pin diagram of ATX power supply. Give specifications of each pin.
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2 Answers

Answer :

image

The diagram shows the pin specification. +5v,+3.3v,+12v and -12v are used for supplying voltages to various peripheral devices.

Following pins have special functions:

1. PS_ON or Power on: This has a green wire which is a signal from the motherboard to the power supply. When the line is connected to ground (by the motherboard), the power supply turns on. It is internally pulled up to +5 V inside the power supply.

2. PWR_OK or Power good: is an output from the power supply that indicates that its output has stabilized and is ready for use. It remains low for a brief time (100–500 ms) after the PS_ON signal is pulled low.

3. +5 VSB or +5 V standby : Supplies power even when the rest of the supply lines are off.

4. +3.3 V sense : This should be connected to the +3.3 V on the motherboard or its power connector. This connection allows for remote sensing of the voltage drop in the power supply wiring.

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Answer :

-12V Used in some types of serial port circuits

-5V Used for floppy controllers

0V Ground

+3.3V Used in many of the new CPUs, system memory, AGP video cards

Power Good Signal (PW-OK) The computer will start up only after power

good signal has been generated.

+5 VSB Standby voltage. Which supplies power to special circuits even when

SMPS is off

PS-ON is an input to SMPS only when the signal is low.
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