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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HVLED815PFTR датащи(PDF) 29 Page - STMicroelectronics |
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HVLED815PFTR датащи(HTML) 29 Page - STMicroelectronics |
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29 / 36 page  HVLED815PF Device description Doc ID 023409 Rev 4 29/36 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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