Other Parts Discussed in Thread: TPS7A4001,
Dear All:
I use the LM5008 to design DC-DC Vin = 60---84V Vout= 12V ,when my system into the sleep mode, the system supply power come from the TPS7A4001,once the sleep mode shutdown, the system power supply come from LM5008,the issue is when I connect the the BAT to LM5008 Vin Pin in active mode, the output voltage is 0 , the LM5008 can't startup, but i cut the FB resistor R65 R66,from 20K,5.1K to 10K , 2.5K the output voltage is normal that is 12V. why cause the result? Can you help to resolve the issue? Thanks~