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L6599AD Datasheet(PDF) 20 Page - STMicroelectronics

No. de pieza L6599AD
Descripción Electrónicos  Improved high-voltage resonant controller
PDF  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6599AD Datasheet(HTML) 20 Page - STMicroelectronics

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Application information
L6599A
20/35
Doc ID 15308 Rev 7
the no load consumption of this stage (0.5 1 W). There is no compliance issue in that,
because EMC regulations on low-frequency harmonic emissions refer to nominal load, no
limit is envisaged when the converter operates with light or no load.
To do so, the L6599A provides pin 9 (PFC_STOP): it is an open collector output, normally
open, that is asserted low when the IC is idle during burst mode operation. This signal is
externally used for switching off the PFC controller and the pre-regulator, as shown in
Figure 26. When the L6599A is in UVLO, the pin is kept open to let the PFC controller start
first.
Figure 25.
Load-dependent operating modes: timing diagram
Figure 26.
How the L6599A can switch off a PFC controller at light load



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