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MC34063A Datasheet(PDF) 11 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) 11 Page - Texas Instruments

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R2
1.25 1
R1
æ
ö
-
+
ç
÷
è
ø
( )
out on
ripple pp
I
t
9
V
(
)
(
)
(
)
(
)
sat
in min
on max
pk switch
V
V
t
I
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-
ç
÷
ç
÷
ç
÷
è
ø
(
)
pk switch
0.3
I
(
)
on
out max
off
t
2I
1
t
æ
ö
+
ç
÷
è
ø
5
on
4
10
t
-
´
(
)
on
off
off
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t
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on
off
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off
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MC33063A, MC34063A
www.ti.com
SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015
Typical Application (continued)
9.2.1.1 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.
9.2.1.2 Detailed Design Procedure
CALCULATION
VOLTAGE INVERTING
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
RSC
L(min)
CO
Vout
See Figure 8
Copyright © 2004–2015, Texas Instruments Incorporated
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Product Folder Links: MC33063A MC34063A


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