I've had my PCB produced from JLCPCB and all the parts are from JLCPCB as well.you cannot reverse the input polarity, opposite to some posts above, 470uH will work just fine, the only thing that changes is the current ripple is less, which is good for the lower peak current at turn off for the device, 47uH may well be too small.
Check your build, duble check, then check again - most issues are due to build - where did you buy the device from ? there are a lot of fakes out there ....
Yes but i am still confused about why when i connect the battery right way; i.e., +12V to +12V, it works perfectly without any heating issues but when i connect the battery the wrong way (reverse polarity) i.e., +12V to Gnd, it makes the IC burst ? the explaination would help me a lot in understanding the electronics behind it.Hello,
The PCB is showing an inductor with the code 471 , wich is an 470 μH inductor , wich is to large as said before.
Um, no, not remotely connected - the issue has been exposed as the OP connecting the 12V input the WRONG WAY ROUND to the input - so case solved really .Peak reverse current of SS34 is 500uA. Peak reverse current of SK34A is 200uA. Maybe that had something to do with it.
Yes, I'm sorry i forgot to mention that in my original post. But, now that it's out there, could you please tell me how my reverse polarity protection circuit is bad because before that i used a diode (SS34) and it didn't seem to work as well, that is why i replaced it with a P-Channel Mosfet.So it would appear - except there is no reference to this at all in the original post - some thing of an oversight perhaps that you forgot to mention that you were zapping the circuit with reversed input volts in an attempt to test this feature ?
Possibly a good idea to mention all the ways you were abusing the converter next time.
Hi thanks for your comment, the MOSFET's pin2 is connected to the 12V plane through a vias on the top layer which also provides to the input pins of the DC-DC through vias.
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