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AN1376 APPLICATION NOTE

Figure 2. Vds & Id @ Full Load

The pictures above show the drain voltage and current at the nominal input mains voltage dur-

ing normal operation at full load. The Envelope acquisition of the scope provides for the pos-

sibility to see the modulation of the two waveforms due to the input voltage ripple.

Figure 4. Vin = 265 Vrms - 50 Hz, @FULL LOAD: DIODE PIV

Vin = 115 Vrms - 50 Hz

Vin = 220 Vrms - 50 Hz

CH1: DRAIN VOLTAGE;

CH1: DRAIN VOLTAGE;

This picture gives the measurement of the

drain peak voltage at full load and maximum

input mains voltage. The voltage peak, which

is 548V, assures a reliable operation of the

PowerMOS with a good margin against the

CH3: +35V DIODE: ANODE VOLTAGE;

CH4: +12V DIODE: ANODE VOLTAGE

CH3: +7V DIODE: ANODE VOLTAGE;

CH4: +3V3 DIODE: ANODE VOLTAGE