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L6599AFD Folha de dados(PDF) 17 Page - STMicroelectronics

Nome de Peças L6599AFD
Descrição Electrónicos  Very low temperature improved high voltage resonant controller
PDF  32 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6599AFD Folha de dados(HTML) 17 Page - STMicroelectronics

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L6599AF
Application information
32
eliminating the no load consumption of this stage (0.51 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 L6599AF 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 9. When the L6599AF is in UVLO, the pin is kept open to let the PFC controller start
first.
Figure 8. Load-dependent operating modes: timing diagram
Figure 9. How the L6599AF can switch off a PFC controller at light load



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