Datasheet

A5973D Application information
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8.10 External SOFT_START network
At start-up the device can quickly increase the current up to the current limit in order to
charge the output capacitor. If soft ramp-up of the output voltage is required, an external
soft-start network can be implemented as shown in Figure 26. The capacitor C is charged
up to an external reference through R and the BJT clamps the COMP pin.
This clamps the duty cycle, limiting the slew rate of the output voltage.
Figure 26. Soft-start network example