I have a switching power supply 12v 5A 60W.Driver mosfet IC burned.
Label on IC is cleaned. I traced pcb lines and determined pin configuration of IC.
pin configuration is in below picture.
mosfet is 5N60CT, n-channel. Now, I need to help me about IC number according pin configuration.
I searched in google about mosfet driverIC
, but anymore of results not match with pin configuration.
This power supply is ip-1205 model made in china.
You’re really making me guess here........ you’ve told me very little. A picture would’ve been nice.
My guess is a uc3842. I think you’ve got the ic the wrong way around. The mosfet has probably failed and taken out the ic as well. This is usually caused by the electrolytic caps dying - most likely a little 47-220uF on the chip supply pin. This dries out and the power supply starts chirping. Personally, i’d suggest just replacing the power supply.
If you want more assistance, post a photo so there’s less to guess.
This is power supply board. I checked uc3842 pin configuration.it's not match.
What is value IC supply? Is this ok ,around 15V?
If change pcb,can I replace uc4832?
Sorry, i don’t have x-ray vision to see the other side of pcb.
Can you substitute an ic? Not likely in this instance.
Realise that you are not looking for a mosfet driver ic, but a power supply chip.
Why are you wanting to know what chip it is? Do you want to fix the psu or design one?
Some switch-mode power supplies have the switch built into the controller. This is probably not one of those.
Some have a controller that directly drives the switching FET. This COULD be one of this type.
Some, particularly over 200W or so, have a controller, a FET driver, and a switching FET. This COULD be one of this type.
So, until there is some additional information with some quality to it (e.g. not "I think it has a separate FET driver"), not much help can be provided.
Also, are you positive that the FET is still good. One of the most common causes of driver failure is that the FET fails first.
Jim
As a general guide, the chips with the internal fets are good for up to 30W. Your 20-100w class like this psu and laptop bricks will probably have a uc3842 in them. Anything bigger these days will probably have power factor correction.
But this is a cheapy supply. The caps look ok, so i would check the kickstart resistors that are around 220k to 560k and these go open circuit due to the voltage across them. Then there’s the little electro on the bottom left if the picture. He is the filter cap for the ic. The ic is powered from a winding on the transformer via a diode to this cap. The kickstart resistor bleeds enough volts for the ic to start and the the transformer takes over.
If the fet goes, it is usually violent and takes out the sense resistor and the ic and anything in between.
As a general guide, the chips with the internal fets are good for up to 30W.
Power Integrations
AC-DC Converters
TOPSwitch-JX
https://ac-dc.power.com/products/topswitch-family/topswitch-jx/
