Post Go back to editing

negative voltage psu on LTC3863

I just build on my pcb application from Figure 14. 12V to 42V Input, –48V/300mA Output, 440kHz Inverting Converter
from LTC3863 manual. Without loads it works fine (consumption current bellow 5 mA) but with load 480R consumtion, after power up, current rise to 500mA which trig LAB PSU safety feature so input volttage is shutdown after 1 sec timeout input is restored and again input current is 500mA. after few cycles P-channel transitor is blow, and often IC also. Please advice what I did wrong.

[edited by: JValeriani at 7:45 PM (GMT 0) on 10 Oct 2019]
Parents Reply Children
No Data