ZHCSND7 September 2022 SN6507-Q1
PRODUCTION DATA
SN6507-Q1 device supports soft-start feature. Upon power up or when EN/UVLO pin transitions from Low to High, the gate drive of the output powerFET is gradually increased over a period of time from 0 V to full driving strength. Soft-start prevents high inrush current from VCC while charging large secondary side decoupling capacitors, and also prevents overshoot in secondary voltage during power-up.
The sort-start time to ramp to the peak switch current is calculated by the capacitor and resistor on SS/ILIM pin with the following formula.