Help identify 6 pin chip in screwdriver charger (Steinhaus PRO-CH144-2) - Page 1
Forum section: electronics / repair

author: pandrew
author_rank: Contributor
timestamp: October 23, 2024, 05:54:47 pm
content: 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: GNDPin 2: feedback through optocouplerPin 3: resistor to groundPin 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 R11i'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.

author: fzabkar
author_rank: Super Contributor
timestamp: October 23, 2024, 09:14:52 pm
content: OB2262 has a matching pinout, but the FB voltage may be different:http://file.remont-aud.net/baza/ic_power/sm_data/OB2262_data.pdfThis resource produces about 20 hits when I input your pin definitions:https://remont-aud.net/ic_power/

author: fzabkar
author_rank: Super Contributor
timestamp: October 24, 2024, 04:01:47 am
content: The photo in this thread ...https://www.elforum.info/topic/134240-alimentator-steinhaus-pro-ch144-2/... has a different flyback controller, marking "63 635".That's an OB2263MP.https://xonstorage.blob.core.windows.net/pdf/onbright_ob2263mp_apr22_xonlink.pdf(datasheet)https://ae-pic-a1.aliexpress-media.com/kf/Sd6ac294ce33c4f1ab0cf14eb52073985S/-10pcs-100-New-OB2263MP-OB2263-2263-63-SOT23-6-Chipset.jpg(photo)

author: pandrew
author_rank: Contributor
timestamp: October 25, 2024, 04:33:42 am
content: Thank you so much, I have ordered some, and I'll try replacing it...

author: pandrew
author_rank: Contributor
timestamp: July 25, 2025, 04:00:09 pm
content: So I have replaced the controller but it didn't immediately start working. (that was a while ago)Today I investigated a bit more, and I found that on the secondary side of the transformer there are two "SR5150 JXH" diodes in parallel, that rectify the output of the secondary. One of those two diodes was shorted out. After I removed it, the charger started up and the green light turned on (with the red light briefly giving out a flash on startup)I haven't tested charging any batteries yet, cause I don't have them on hand, but the output is around 18V (specification on the bottom is 17.5V)So I think it's probably fixed.I replaced the shorted "SR5150 JXH" diode with a "SR5150 MIC" diode.I would have preferred to use two diodes from the same batch, to make it more likely that the currents are going to be distributed evenly, but on short notice I could not get two replacements. Hopefully it's gonna be good enough.@fzabkar: Thanks for your help!