Tool/software:
Hi, I'm having trouble getting an LM5146 circuit to work as I want. My setup has Vin=100V and Vout=52V, SYNCIN pulled high, and no load during power-up. About N ms after the output reaches the target voltage, switching stops and the output decays down to 0V. I'm operating under the assumption that the LM5146 is stable in DCM and goes unstable as it transitions to FPWM, but based off the quickstart calculator I would expect it to be stable, but I've reached the end of my expertise. Could anyone please assist?
Thanks
LM5146_quickstart_calculator_revB1_100V-52V_300kHz_r3.xlsx
Startup Waveform with Vin = Yellow, Vout = Blue, SW = Green