AN4077

Test results and significant waveforms

Doc ID 022997 Rev 1

19/33

Because the brownout thresholds in the L6564H are internally fixed, the startup and

shutdown threshold can be adjusted slightly modifying the resistor values used for the MULT

pin. In

Figure 24 a startup tentative below the startup threshold is captured. As seen, at

the L6564H turn-on threshold.

In

Figure 25 and 26 the circuit waveforms during brownout protection operation are

captured. In both cases the mains voltages were increased or decreased slowly: as can be

seen, at turn-on or at turn-off there are no bouncing or starting attempts by the PFC

converter.

In

Figure 27 and 28 the waveforms during the startup of the circuit at mains plug-in are

Figure 24.

AM11518v1

Figure 25.

EVL6564H-100W startup with slow

input voltage increasing-full load

Figure 26.

EVL6564H-100W turn-off with slow

input voltage decreasing-full load