I have designed a power supply module using
1> LTC3889 - output-1=24vdc, output-2=24vd. and
2> LTM4653 output-3 = 48vdc
Input voltage = 50VDC.
Problem: LTM4653 input and output get short to ground( mosfet ) when ever i switch on LTC3889 using RUN pin.
LTM4653 = switching frequency 1.2 Mhz. design is exactly copied from https://www.analog.com/en/products/ltm4653.html#product-evaluationkit
i feel cause of problem might be
1> FSET Resistor placed near to LTC3889 output inductor.
2> CLKIN pin floating connected to TP-testpoint using resistor.
let me known if any additional data is required to solve this problem.