MP175GS under voltage input protection

AC-DC Power Converters
1

Is it possible to prevent the MP175GS starting to deliver power below 80V?
I don’t want it to start unless a proper supply is present.

2

Doesn’t look like it, Mouser has it going end of life, you might want to investigate, and consider picking another part that doesn’t allow you to do this either.

I suppose at less than 80V Vin you could short the output which would put it in a relatively low power mode.

3

Hi adrian,

Welcome to the MPS Forum!
The HF500-xx series has a Brown in and Brown out pin with 100mV hysteresis that can be used for the 80V start up. It needs a resistor divider to sense the rectified voltage.

Check out the HF500-xx series using the link below,
Flyback Controller | Secondary Side Regulation | MPS | Monolithic Power Systems

Also MP175GS is an active part, it is not going end of life. Check out the device on Mouser below,
Search results for: mp175gs AC/DC Converters – Mouser

4

Hello Sunandhitha, Thanks for your reply. The HF500 series appears to need a transformer which would increase the solution volume significantly over the use of a small, single inductor for the MP175GS.
Our application is to provide a 12or 16V supply to start a PFC circuit on a multi kilowatt power supply. So we want to prevent it all starting at low input voltages. Is there not a way to inhibit this part at low input voltages by over riding one of the signal pins?

5

Hi adrian,

we are looking into this and will get back to you soon with some suggestions.

6

Hi adrian,
what is the output power requirement for the 12/16V supply?

7

Hello Sunandhitha, We need to supply ~25mA at start up and then it will provide ~100mA at 12V when the system is running.
Thanks,
Adrian.

8

Hi adrian,
Thank you for sharing more info about the power requirements. I am currently discussing this with my team, I will get back to you soon with the suggestions.

9

Hi Adrian,

MP155 is a better option considering the 12V/100mA power requirement. This is a transformer less solution as well.
Under voltage protection can be implemented with the help of additional external circuitry. Please contact MPS Now(mpsnow@monolithicpower.com) for more details.