JAJSGE0C JANUARY 2014 – October 2018 TPS40425
PRODUCTION DATA.
Before soft-start operation begins to generate a PWM signal, the VDD voltage for power stage must be prepared. Please refer to the power stage datasheet for VDD value. Without preparation, the TPS40425 device outputs the PWM signal at maximum duty cycle, because the power stage is not working and output voltage is not regulated.
The VDD voltage for power stage needs to be above its threshold until TPS40425 device is turned off.