Other Parts Discussed in Thread: LM5160DNTBK-CALC, LM5160
HI
below is the SCH for the buck circuit design using LM5160A, input voltage is from 40V to 60V, the problem is: the inductor temperature is very high even when the load is small or none.
the SW waveform is as below when there is no load added:
add some loads about 80mA, SW waveform and output ripple voltage is as below:
it's the stability problem.
I use TYPE3 ripple configuration.
The parameters of RON(R4=681k) , RA(R1=402k), CA(C1=3nF), CB(C6=10nF) are from Webench power designer, also i calculate these values based on application note AN-1481. No problem was founded.
can anyone help to look at this? any feedback is welcome.
Thanks