TPS65640: Power management forum

XIAO CHEN

Part Number: TPS65640

hi,my TPS65640 power ic Positive voltage and negative voltage are not synchronized，I want to output the same voltage value，eg：AVDD output +6.0V at the same time VGL is -6.0V

over 3 years ago

0 Liaqat Khan over 3 years ago

TI__Mastermind 18550 points

Hello Xiao,

Negative charge pimp is only enabled and starts ramping up after AVDD has reached its programmed voltage value. So AVDD will always come up first and than negative charge pump VGL. They can not come up at the same time.

Kind Regards,

Liaqat

0 XIAO CHEN over 3 years ago in reply to Liaqat Khan

Prodigy 40 points

But I need's Voltage value with the same absolute value

0 Liaqat Khan over 3 years ago in reply to XIAO CHEN

TI__Mastermind 18550 points

Hello,

What voltage values are you currently getting for AVDD and VGL rails?

Can you please attach schematics of your design? Also, please let me know the values that registers 0x01 and 0x06 are programmed to.

Kind Regards,

Liaqat