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AN3142 Datasheet(PDF) 36 Page - STMicroelectronics

Part # AN3142
Description  Solution for designing a 400 W fixed-off-time controlled
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3142 Datasheet(HTML) 36 Page - STMicroelectronics

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L6563H: high voltage startup transition mode PFC
AN3142
36/44
Doc ID 17005 Rev 3
Figure 24.
High-voltage startup behavior during latch-off protection
As a result, shown in
Figure 24, the voltage at pin Vcc, oscillates between its turn-on and
turn-off thresholds until the HV bus is recycled and drops below the startup threshold of the
HV generator. The high voltage startup circuitry is capable of guaranteeing a safe behavior
in case of a short circuit present on the DC-DC output when the Vcc of both controllers are
generated by the same auxiliary winding.
GD
Vin
VccON
t
t
t
t
VccOFF
PWM_LAT CH
Vccrestart
VHVstar t
HV generator is turned on
Disable latch is reset here
HV_EN
Fault occur s here
HV generator turn- on is disabled here
Input source is r emoved here
t
Vcc
()



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