LM5170-Q1: LM5170-Q1 OVPA function

Hi HuangWei,

did you measure the waveform in OVPA pin to make sure that the pin voltage doesn't change with the output current?

Hi Jasper,

Thanks for your reply, the voltage in OVPA will increase when loading up, but the trigger point is getting higher!! 
Do you have any idea about this situation?
 By the way, I just enable the buck converter in LM5170.

Hi HuangWei,

it seem like circuit is impacted by the noise because of the layout. or maybe the AGND is not well placed. did you follow the suggest in the datasheet to do the layout?

Hi Jasper,

    You are right, I put the shunt capacitor near the OVP pin and the OVP protections are working fine.

    But I have another issue, I can get the maximum current when used CC mode in electronic load, but the output voltage will be unstable when used the CV mode (setting below 10V),

    I think that no matter how much voltage is set in CV mode, it should be the maximum current drawn and output voltage stable, but the output voltage is overshoot leads to shut the PWM..... 

    my spec as below.

   input: 30~60Vdc, output: 13.5V@22A   

Hi Huangwei,

if the e-load is set to CV mode, the device reach its maximum output current set by the ISETA and SETB

what is the signal waveform at ISETA and ISETB at such condition? you can also try small value at ISET pins to avoid device shutdown