AN2872

Experimental results

Doc ID 15305 Rev 1

17/23

Figure 11.

Drain voltage (CH1) and inductor current (CH4) at different input voltages

The waveforms in Figure 10 show also the change of duty cycle (ON time) with input

voltage. The converter finally operates in burst mode for highest input voltage.

4.5

Short-circuit behavior

The short-circuit protection is integrated in the VIPer16. If the peak current is limited by the

internal threshold at maximum level for a duration of 50 ms (internally set), the Viper16

interprets this state as overload (short-circuit) and switches off the converter for 1 s. The

typical waveforms for different input voltages are displayed in Figure 12.