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AN2435 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2435
Description  TM sepic converter in PFC pre-regulator
Download  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2435 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2435
2/25
Contents
1
Sepic topology for PFC converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1
Operation of the sepic converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2
Sepic converter as a PFC circuit operating in transition mode [1.] . . . . . . . 6
1.3
Coupled inductor sepic converter and ripple steering . . . . . . . . . . . . . . . 10
1.4
Small signal model for a TM sepic converter . . . . . . . . . . . . . . . . . . . . . . 12
2
Practical design example of a sepic converter . . . . . . . . . . . . . . . . . . 13
2.1
Design specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2
MOSFET (M1) selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3
Diode D1 selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4
Capacitor C1 selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.5
Output capacitor C2 selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.6
Transformer design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.7
Selection of other components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4
Board description and bench evaluation results . . . . . . . . . . . . . . . . . 18
4.1
Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2
Bench results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24


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