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AN4248 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN4248
Description  60 W PSU design details for water purifier system
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4248 Datasheet(HTML) 16 Page - STMicroelectronics

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Basic power stage calculations
AN4248
16/46
DocID024214 Rev 1
Equation 11
D = 0.51
Secondary duty cycle:
Equation 12
D' = 0.43
Secondary peak current can be calculated with below equation:
Equation 13
Ipks = 11.63A
Primary side DC current can be calculated with below equation:
Equation 14
IDCp = 0.56A
Output average current:
Equation 15
IDCs = 2.5 A
Primary side RMS current can be calculated with below equation:
Equation 16
IRMSp = 0.9 A
Secondary RMS current can be calculated with below equation:
Equation 17
IRMSs = 4.4 A



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