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AN2389 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN2389
Description  An MCU-based low cost non-inverting buck-boost converter for battery chargers
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2389 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN2389
2/16
Contents
1
Circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
Buck-boost implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2
Buck converter implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3
Boost converter implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Selection of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Application in battery charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1
Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2
Software flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Test environment and results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15


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