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HVLED001BTR Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças HVLED001BTR
Descrição Electrónicos  High power factor flyback controller with constant voltage primary-sensing and ultra-low standby consumption
PDF  33 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HVLED001BTR Folha de dados(HTML) 21 Page - STMicroelectronics

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DS12748 Rev 2
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HVLED001B
Application information
33
Figure 20. Control loop blocks
7.2.1
Current sense input
The peak of the primary current is read across a shunt resistor placed between the
MOSFET‘s source and compared with a threshold equal to:
Equation 1
Where the term VHVSU,pk is the maximum value of the HVSU voltage within around 20 ms
and is used to compensate the dependency on the input voltage of the open loop gain
transfer function. The gain kp collects all the proportional terms between HVSU voltage and
CS threshold.
A leading edge blanking time (LEB) is applied after MOSFET‘s turn-on.
VCS signal is upper limited to a value that depends on the OPTO voltage and is lower
limited to 60 mV.
A second level OCP threshold is present to temporarily stop the switching activity in case of
inductor saturation.



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