UC3842: Why the curent sampling resistor always burnted out?

user5886917

Part Number: UC3842

I used UC3842 to design a 30V-60V Boost circuit,but the curent sampling resistor always burnted out.What's the possible reasons?Thank you!

over 5 years ago

0 Teng Feng over 5 years ago

TI__Genius 13660 points

Hello,

It may be because of the low rated power of the sampling resister, please kindly calculate the loss power on the sampling resister, and check whether it exceeds its rated power?

Thanks,
Teng

0 Teng Feng over 5 years ago in reply to Teng Feng

TI__Genius 13660 points

Hello, I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below (or create a new thread if the thread has locked due to time-out) – thanks, Teng

0 user5886917 over 5 years ago in reply to Teng Feng

Prodigy 30 points

I'm sorry I haven't responded to you for so long.After re_laying the PCB,I solved the problem.This problem has bothered me for days.I appreciate you giving me some advice about the problem.Thank you so much.-Ruan

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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UC3842: Why the curent sampling resistor always burnted out?