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Old 19th June 2014, 06:45 AM   #1
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Location: Taoyuan, Taiwan
Default Problem with LM2577-ADJ

I made a circuit based on the schematic below:
Click the image to open in full size.

Diode using 1n5819 and R1 is VR.
This is the circuit I made:
Click the image to open in full size.

I've try many trim pot and the circuit works at the begining.
After seconds the voltage goes very high and I though the IC has burned.
So I changed the new one and the same thing happened until I found a pot like the picture above and put it on the circuit.
When the circuit on, the pot gets very hot just after seconds.
This circuit has burned my two trim pot and I've checked all the wiring and found nothing error.
What's the problem with this circuit?
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Old 19th June 2014, 03:39 PM   #2
jaycee is offline jaycee  United Kingdom
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"based on" means, "like this but i changed some things". What did you change? Ideally, what is the exact schematic you used?

What's the value of the trimpot? How is it connected?

Last edited by jaycee; 19th June 2014 at 03:41 PM.
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Old 19th June 2014, 04:47 PM   #3
BigE is online now BigE  Canada
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What do you calculate the output voltage is supposed to be?
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Old 20th June 2014, 01:53 AM   #4
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Join Date: Oct 2012
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Actually it's not "based on", it's an "implementation" of the schematic. Just some of parts changed.
R1 is a variable resistor so I should adjust the R1 and measure the output voltage to get the desired value.
I think if there is no load in the output then R1, R2 could be the load and that's why R1 gets hot.
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