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Here is an image of the power supply I labeled the 3 chips, however I have only been able to tell that the one in the middle is an op amp, the other two are perhaps marked with some dell proprietary nomenclature, I am not sure.
But what I need to know is where the PWM control chip is so I can try to disable the overcurrent protection on it. The PSU is shutting down on me with overcurrent spikes in my application. This chip is almost universally used in SMPS because a everybody else’s supply uses it; b it works so damn well; c it’s part of catasheet example circuit on all SMPS power supply controller datasheets; d it’s so damn cheap.
SMPS use a TL to detect the output voltage and report back via an optocoupler whether the output voltage is too low or too high. And dafasheet section of the circuit needs to know this? Why, the pulse width modulator, of course!
Those white rectangles, southeast of the “1D4” chip, might be opto isolators. Check whether there’s a TL nearby.
Then get out yer ohmmeter, put it on gabeepen tooter, and start buzzing. Here is the datasheet of the TL That’s what yer lookin’ for, right there. I remember your last thread. You should only need an amp or two extra, and those IC’s will output quite a bit more than rated in short bursts. I was trying to find the PWM Chip on any of them so I could attempt to disable it like this guy has done: However I am struggling to identify where it is on the pcb.
You might be able to hook up a scope to some of the pins on those chips and see which one changes when you load it up to the point where overcurrent kicks in.
Without knowing for sure i can’t find any hints when googlingit would be my initial guess that the DL is a power-factor correction IC, while the DS is the PWM system.
Depending on topology, it may be different.
There is some feedback across the isolation through the 3 white optocouplers, so it may be that i am wrong, but i can’t tell you for sure. Check out what this guy oztules writes in this topic.
He explains the function of these chips, and provides some schematics. If you do a google image search on DNA and DNA you will find some schematics, any you may be able to piece together some info on those. I had this issue when trying the same thing on a smaller Delta 1001rl.
Those chips are proprietary chips made by Delta and there is no datasheet for them.
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Become a Redditor and subscribe to one of thousands of communities. Any ideas on where it is or what I should be looking for? Want to add to the discussion? Buck switchers should work, either a boost converter or a step down in this situation. The LM is an opamp, as you say.