Hi,
I have some questions about TPS56221.
Input voltage is 12V,output volatage is 1.5V, peak load current is about 10A
a) We connect the EN/SS pin with 10nf capacitor and ILIM pin with 2.4kohm resistor.Tps56221 gives hiccup all the time.
b) When we delete the SS capacitor or ILIM resistor ,Tps56221 can work normally.Why is it ?
c) we keep the tps56221 at the status of "b",and we let our board to work at -40℃。EN/SS will be tied low and give hiccup periodically,As shown in the below.The repeat frequency is about 800ms. (the purple line shows PowerGood,and the orange line shows EN/SS).can you give me some advise?
By the way ,How to calculate the resistor or capacitor paramates of the COMP pin,and bow to calculate resistor of the ILIM .What is the range of BOOT jitter is normal?
Looking forward for your replay!
Thanks a lot!
Brian.