Electrical waveform

AN4346

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DocID025107 Rev 1

3.7

Output short-circuit

During a short of the output connector, all the energy stored in the output electrolytic

capacitor is discharged into the output side loop and no current will flow into the external

LED preventing their failure.

The converter is able to regulate the output current to a minimum level reducing the input

power during this fail.

Figure 45. Short-circuit behavior at 100 Vac

- 50 Hz

Figure 46. After short-circuit at 100 Vac - 50 Hz

CH1: DRAIN pin

CH2: CS pin

CH1: DRAIN pin

CH2: CS pin

Figure 47. Short-circuit behavior at 30 Vac

- 50 Hz

Figure 48. After short-circuit at 230 Vac - 50 Hz

CH1: DRAIN pin

CH2: CS pin

CH1: DRAIN pin

CH2: CS pin