PM8800A

PWM section

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Figure 17.

Short circuit on the output

Ch1 = 5Vout, Ch2 = SoftStart, Ch3 = VSS - GND, Ch4 = I input

When a severe over current occurs, like a short circuit of an internal power component, and

0.7 V level is reached on CS, the gate driver is instantaneously shut down and a fast hiccup

cycle is performed. When the 10

µA sink current fully discharges the SS capacitor, a new

soft-start procedure is performed.

In case of persistent severe over current, the control logic tries 4 cycles of fast hiccup before

shutting down the PWM controller at all.

To restart the device, after removing the cause of over current, VIN must be lowered under

UVLO level.