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AN2389 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN2389
Description  An MCU-based low cost non-inverting buck-boost converter for battery chargers
PDF  16 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2389 Datasheet(HTML) 7 Page - STMicroelectronics

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AN2389
Theory of operation
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2.3
Boost converter implementation
Again if you keep switch SW1 (PWM1) always in ON condition and drive the Switch SW2
(PWM2) with a PWM signal generated by the microcontroller, then the combination works as
a boost converter except that you have an additional free wheeling diode D1 which you can
ignore.
Figure 4.
Boost converter implementation
If the input voltage is Vin, the duty cycle of the PWM signal driving PWM2 is D2 and the drop
across the diode d2 is Vd2, then the output voltage Vout is given by:
Vout = Vin / ( 1 - D2) - Vd2
ON
PWM2
VOUT
C
d1
P-
P+
L
d2
VIN
SW2
SW1



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