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HVLED815PF bảng dữ liệu(PDF) 29 Page - STMicroelectronics

tên linh kiện HVLED815PF
Giải thích chi tiết về linh kiện  Offline LED driver with primary-sensing and high power factor up to 15 W
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HVLED815PF bảng dữ liệu(HTML) 29 Page - STMicroelectronics

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HVLED815PF
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Equation 18
Where VOS_TYP is the desired voltage across COS capacitor applying the VIN_TYP typical
input voltage (i.e. VIN_TYP=220 V for 176/264 Vac input range); Fsw is the switching
frequency and can be estimated using the following formula, where fT and fR are the
transition and resonant frequency respectively:
Equation 19
Equation 20
Equation 21
where CD is the total equivalent capacitor afferent at the drain node.
Based on the desired voltage across COS capacitor and calculated ROS resistor, then the
sum of RA and RB can then calculated as a results of partitioning divider:
Equation 22
Using the previous ROS resistor value the RPF resistor can be estimated using the following
formula:
Equation 23
Finally the current sense resistor RSENSE can be estimated in order to select the
desiderated average output current value:
π



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