Application ideas

AN1518

28/30

10.6

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 29. The capacitor C is charged

This clamps the duty cycle, limiting the slew rate of the output voltage.

Figure 29.

Soft start network example