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What does a comparator do ub ATX Power supply with TL494

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carpenter

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On picture is typical connections ATX power supply drivered TL-494
I'm interested in comparator 3.
This comparator compare voltage from Error amplifier in TL494 (pin 3) integrated on C36 10nF with voltage on - input pin8 (LM-339) around 1,2V
I'm not clear what it is good for?

ATX.gif
 

Looks like the comparator wireball eventually makes the
PG (Power Good) signal and one term is the FB (error
amp (-) input I expect) is somwehere sane (not railed
trying to get there, but satisfied).
 

Agreed - part 2 monitors the 'start/stop' signal from the motherboard.
The other sections monitor the voltages on the output lines and produce the 'Power Good' (PG) signal which eventually drives the motherboard reset line.

Brian.
 

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