Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Your welcome shadetreetrader11. So I'm guessing that CN2 is not connected to anything in the motor home, is just for programing and test ?
kiloamp
New Member
Last Activity: 02-22-2023, 02:45 PM
Joined: 12-02-2022
Location: Winnipeg, Manitoba
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Hello Shadetreetrader11, U6 is a KA431az. It's a programmable shunt regulator,
[URL="https://www.onsemi.com/pdf/datasheet/ka431-d.pdf"]https://www.onsemi.com/pdf/datasheet/ka431-d.pdf[/URL]
Do you know what CN2 connects to ?Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Hello Shadetreetrader11, U6 is a KA431az. It's a programmable shunt regulator,
[URL="https://www.onsemi.com/pdf/datasheet/ka431-d.pdf"]https://www.onsemi.com/pdf/datasheet/ka431-d.pdf[/URL]Last edited by kiloamp; 12-27-2022, 07:58 AM.Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
You could be right Redwire,the connector has one pin to ground, one pin to pin 3 of the pic and one pin to a 330 ohm resistor then to pin 6 of the pic120508A. R50 may be for setting current limit ?, the same board is used for 3 different current outputs. Learned a bit from this board, probably use it to power other projects at the bench for now.Last edited by kiloamp; 12-09-2022, 05:39 PM.Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Well turns out the WF-88XX series is older and discontinued. The 3 pin connector is for a switch to toggle through the different modes. After days of internet searches that's all I found. I guess if the fan came on sooner it would help.
Enough time spent on this, it works now so good enough.Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Hi Redwire, thanks for the reply. Good thought but the fan has 2 wires and is plugged in at the other end between the fan and heat sink. You can't see it in the pictures.
The connector in question is at the two 8 pin IC's . I think one is an op-amp and the other a pic maybe. I was thinking maybe there were indicator led's or a mode switch, just guessing.Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Hello, I was given a WFCO-8845 for salvage but could not resist fixing it. And yes it was just the one electrolytic cap (C10) that caused all the trouble. It works fine now but the two power resistors sure get HOT, even with only a 2.5 amp load. Many thanks for your sharing.
I have one question, can someone tell me what the 3 pin connector is for. I never saw the board installed. Thanks....Leave a comment:
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Re: New Members - please post your introductions here
Hello to all, and thank you to all. Retired and still learning.Leave a comment:
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