EVL6563H-100W View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'EVL6563H-100W' PDF : 31 Pages View PDF
AN3118
Test results and significant waveforms
Figure 31. EVL6563H-250W load transient at 115 Vac - 60 Hz - full load to no-load
CH1: PFC output voltage,
CH2: PFC_OK (pin #7),
CH3: gate drive (pin #15),
CH4: Iout
The event of an open-loop is shown in Figure 32 and 33; notice the protection intervention
latching the operation of the L6563H. In order to keep the L6563H latched after the open-
loop detection, in Figure 33 it is possible to note the activation of the HVS circuit, it’s
necessary to keep the L6563H correctly supplied, sustaining the Vcc value above the
Vccrestart voltage. As mentioned previously, to restart the system it is necessary to recycle
the input power. The connection of the HVS pin after the rectifier bridge allows a faster
restart in the case of latch than connecting the pin to the bulk capacitor. In that case, in fact,
to restart the operation it is necessary to wait the time needed by the HVS to discharge the
bulk below the minimum start voltage of the HVS pin (VHVstart on the data sheet) before the
Vcc drops below the Vccrestart to resume the operation.
Figure 32. EVL6563H-250W TM PFC: open=-
loop at 115 Vac - 60 Hz - full load
Figure 33. EVL6563H-250W TM PFC: open-
loop at 115 Vac - 60 Hz - full load -
long acquisition
CH1: PFC output voltage, CH2: Vcc (pin #16)
CH3: gate drive (pin #15)
CH4: PWM_LATCH (pin#8)
CH1: PFC output voltage, CH2: Vcc (pin #16)
CH3: gate drive (pin #15)
CH4: PWM_LATCH (pin#8)
Doc ID 16847 Rev 2
21/31
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