Other Parts Discussed in Thread: LM5176,
Hi,
I'm designing DC charger using LM5175 IC, specs:
Vin: 10-16V
Vout: 14V
Switching Freq: 256k Hz
We encounter an issue below
When the DC charger start-up in boost mode it will deliver about 20A, then when we increase input voltage to push the DC charger work under buck mode, it will drop to 16-17A. However, when we decrease input voltage to force it to work under boost mode, it won’t do 20A again.
Is there something relate to COMP and SLOPE control?
https://www.ti.com/tool/LM5175QUICKSTART-CALC
I had a look at TI cals sheet and work out phase margin is 11 degree and cross-over freq is 21.3k Hz.
Do you have any suggestion to select RC value for COMP pin?, e.g. what is the cross-over freq?
Thanks,
VT