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MC34063A Datasheet(PDF) 15 Page - Texas Instruments

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Part No. MC34063A
Description  1.5-A Peak Boost/Buck/Inverting Switching Regulators
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

MC34063A Datasheet(HTML) 15 Page - Texas Instruments

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Q
S
R
CT
Ipk
Q2
Q1
2
1
CT
Oscillator
_
+
1.25-V
Reference
Regulator
4
5
3
8
7
6
RSC
0.33 W
3.8 kW
R2
L
220 mH
CO
1N5819
470 mF
470 pF
R1
1.2 kW
100 mF
+
+
VCC
VOUT
5 V/500 mA
1.0 mH
100 mF
+
Optional Filter
VIN
25 V
Comparator
V
OUT = 1.25 (1+
R2
R1
)
MC33063A, MC34063A
www.ti.com
SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015
9.2.3 Step-Down Converter Application
Figure 11. Step-Down Converter
9.2.3.1 Design Requirements
The user must determine the following desired parameters:
Vsat = Saturation voltage of the output switch
VF = Forward voltage drop of the chosen output rectifier
The following power-supply parameters are set by the user:
Vin = Nominal input voltage
Vout = Desired output voltage
Iout = Desired output current
fmin = Minimum desired output switching frequency at the selected values of Vin and Iout
Vripple = Desired peak-to-peak output ripple voltage. The ripple voltage directly affects the line and load
regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the
calculated value, to account for the capacitor's equivalent series resistance and board layout.
Copyright © 2004–2015, Texas Instruments Incorporated
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