power supply with both ics tl494,lm339 .. #2

Thread Starter

roberus

Joined Feb 18, 2021
1

Attachments

Last edited by a moderator:

crutschow

Joined Mar 14, 2008
27,231
The LM339's appears to be operating as an overvoltage detector that generates a PG 5V signal when an overvoltage is sensed.
 

Dodgydave

Joined Jun 22, 2012
9,955
The Lm339 is used to give the Power Good signal out , it checks when 12V supply is up and running.

The TL494 has built in op amp detection on pins 1,2 and 15,16 for Voltage and current sensing, so for extra protection to shut it down a positive pulse is applied to pin 4.
 
Top