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AN4314 Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças AN4314
Descrição Electrónicos  25 W wide-range high power factor buck-boost converter demonstration board using the L6564H
PDF  31 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4314 Folha de dados(HTML) 21 Page - STMicroelectronics

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DocID024821 Rev 2
21/31
AN4314
PFC waveforms
31
When the load is disconnected, first the current loop tries to compensate the low current
sensed on R6 and R7 and increases the output of U1 (pin 5). As a consequence, the COMP
pin increases too, but as the output voltage reaches about 85 V
dc
, the voltage loop
operates, and the output of U1 is forced to decrease. The overlap of these two effects can
be seen on the COMP pin (CH2). As this signal falls, it triggers the burst mode. During this
operation the output voltage of the converter decreases, V
CC
voltage reaches its turn-off
level and the L6564H shuts down. Only when V
CC
voltage reaches the V
CC
-restart
threshold does the HVS generator pump current into the V
CC
capacitor and the L6564H
restarts switching.
Figure 18. Load disconnection transition at
100 Vac/50 Hz
Figure 19. No load at 100 Vac/50 Hz
Figure 20. Load disconnection transition at
230 Vac/50 Hz
Figure 21. No load at 230 Vac/50 Hz



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