Circuit operation

AN2544

12/17

Figure 10.

Burst mode

1.8

Short circuit

the pulse is terminated. This is manifested by reducing the output voltage as the current is

increased. The voltage decreases until it falls below the undervoltage shutdown threshold of

starting voltage, the current is limited by the pulse-by-pulse current limit. The voltage falls to

the undervoltage shutdown point and the cycle repeats itself at a 16% duty cycle. This

reduces the RMS current going through the circuit as seen in Figure 11.

Figure 11.

Operation during a short