10V to 200V in to 7.5V out using MP9488

DC-DC Power Converters
1

I created a design to achieve 7.5 volts out and a quick test shows it basically working, but when the input voltage goes below 20V, it starts to shut down. Any suggestions? Also, is there an LTSpice model available? Also, does the converter need to stay continuous or is DCM supported.

schematic
schematic803×390 23.7 KB

Thanks.

2

Hi @dan.barbour,

Can you check the Vcc voltage at 20V? If Vcc is less than 3.35V, the IC would shutdown. or Do you notice any fault conditions? like OLP, SCP or OTP?

Thank you
Saurabh