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HVLED001B Datasheet(PDF) 19 Page - STMicroelectronics

No. de pieza HVLED001B
Descripción Electrónicos  High power factor flyback controller with constant voltage primary-sensing and ultra-low standby consumption
PDF  33 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HVLED001B Datasheet(HTML) 19 Page - STMicroelectronics

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DS12748 Rev 2
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HVLED001B
Application information
33
7.1.1
Start-up mode
This state is entered to begin the switching activity (during application's turn-on or exiting
from the low consumption state). The HVSU is involved in the mechanism of VCC charging;
all other peripherals, except the UVLO and logic supply, are turned off to minimize the start-
up time.
Start-up mode ends when the OPTO and FB pins are within respective range of operations
and VCC is higher than VCC,on threshold.
When the device is turned on for the first time or, in other words, when VCC crosses
upwards of the VCC,shd threshold, start-up mode invokes ramp-up mode.
When start-up mode is entered after a low consumption mode, start-up mode invokes active
mode.
Figure 19. Initial start-up phase



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