Author Topic: UD2.7C constantly in OCP despite having signal  (Read 406 times)

Offline verliebt_in_neukölln17

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UD2.7C constantly in OCP despite having signal
« on: June 12, 2024, 06:54:49 PM »


Hey, so I need some help my UD2.7C constantly being in OCP, I’m feeding a sine wave signal of about 52kHz with an amplitude of about 3 volts into the feedback jack, for the signal I’m just momentarily shining my phone flashlight into the optical receiver, I know I’m getting a signal since the signal LED lights up every time, one thing I’ve also noticed since the beginning is the 9v regulator heating up immensely after about ~10 secs, no other IC is heating up

How I know the UD semi-works? The first time I hooked the thing up and tested it, I got a signal on the gate drive that magically vanished after I turned the UD on again.

Some help would be gladly appreciated.
« Last Edit: June 12, 2024, 07:06:57 PM by verliebt_in_neukölln17 »
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

Offline flyingperson23

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Re: UD2.7C constantly in OCP despite having signal
« Reply #1 on: June 12, 2024, 07:53:31 PM »
The OCD light doesn't only shine for overcurrent, iirc it also shines for undervoltage lockout and sometimes when it's powered on before it gets an interrupter signal. Given that your 9v regulator is burning up, maybe something on the 9v or 5v rails is shorted and is pulling the 24v rail down enough to trip uvlo.

Offline verliebt_in_neukölln17

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Re: UD2.7C constantly in OCP despite having signal
« Reply #2 on: June 12, 2024, 08:41:06 PM »
I currently do not have the UVLO jumper connected, I also read the normal voltages on every IC and regulator and 24v on the input so I don't really suspect a short anywhere
« Last Edit: June 12, 2024, 08:43:08 PM by verliebt_in_neukölln17 »
My semiconductors went kapow, IGBTs are fried somehow.
With sparks and pops, they took a flight,
Turning day into night!

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Re: UD2.7C constantly in OCP despite having signal
« Reply #2 on: June 12, 2024, 08:41:06 PM »

 


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