ZHCSMK6B September 2021 – November 2022 TPSM82864A , TPSM82866A
PRODUCTION DATA
After enabling the device, there is a 650-µs enable delay (tDelay) before the device starts switching. The tDelay time varies with the VSET/MODE resistor used and is longest with a resistance of 249 k or higher. After the enable delay, an internal soft-start circuit ramps up the output voltage in 1 ms (tRamp). This action avoids excessive inrush current and creates a smooth output voltage ramp up. This action also prevents excessive voltage drops of batteries that have a high internal impedance. Figure 8-2 shows the start-up sequence.
The device is able to start into a pre-biased output capacitor. The device starts with the applied bias voltage and ramps the output voltage to its nominal value.