Other Parts Discussed in Thread: LM5170
Hello:
Some time ago, I have asked a related issue about adjusting Vout using REF. I use the method is :to remove U13 (the Vref device), and add the flying wire across C95. In one pcb board, I have tested in the buck and boost mode, they are all working normally. But now that board is broken. I use another new pcb board to test, using the same way. But in the boost mode, the Vout can't be changed. When I change the REF voltage, but the Vout is still 50.2V. But in the buck mode, I can use changing REF voltage to adjust Vout from 6V to 20V. So could you help me analysis this phenomenon? Is this board broken? Thank you very much! I will wait for your reply!