Author Topic: Help identify 6 pin chip in screwdriver charger (Steinhaus PRO-CH144-2)  (Read 532 times)

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Offline pandrewTopic starter

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This charger only provides 2 contact pins to the battery, so it's not very sophisticated, this is what the bottom of the PCB looks like: (please see attached image)
I had to replace a number of components, but I'm stuck, because the little 6-pin IC1 appears to also be dead, and I don't know what it is.
The SMD markings say: "Z10J2" and "573", with the Z appearing to be styled differently, it may be a logo.
Has anyone seen this component before and know what it is? My googling is failing me.

Note that pinout looks like this:
Pin 1: GND
Pin 2: feedback through optocoupler
Pin 3: resistor to ground
Pin 4: source of the SMF5N60 mosfet, which is connected to ground by R7..R10 low value resistors.
Pin 5: VCC (electrolytic capacitor is connected between Pin 5 and Pin 1, and Pin 5 is fed by R12 and R13(probably on startup, and then I think By D3 and R14) There's nothing to limit voltage on Pin 5 as far as I can tell, so I think the IC must have a zener diode in it.
Pin 6: goes to drive the gate of the mosfet through D2 and R11

i've attached a picture of the IC markings too.

Note that I had to replace these components: R7, R8, R9, R10, R5, and on the opposite side the 3.15A/250V fuse, and two of the bridge rectifier diodes died.

Any help would be greatly appretiated.


« Last Edit: October 23, 2024, 06:27:52 pm by pandrew »
 

Offline fzabkar

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Re: Help identify 6 pin chip in screwdriver charger (Steinhaus PRO-CH144-2)
« Reply #1 on: October 23, 2024, 09:14:52 pm »
OB2262 has a matching pinout, but the FB voltage may be different:

http://file.remont-aud.net/baza/ic_power/sm_data/OB2262_data.pdf

This resource produces about 20 hits when I input your pin definitions:

https://remont-aud.net/ic_power/
 

Offline fzabkar

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Offline pandrewTopic starter

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Re: Help identify 6 pin chip in screwdriver charger (Steinhaus PRO-CH144-2)
« Reply #3 on: October 25, 2024, 04:33:42 am »
Thank you so much, I have ordered some, and I'll try replacing it...
 


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