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MC34063AD Datasheet(PDF) 11 Page - HTC Korea TAEJIN Technology Co.

Part No. MC34063AD
Description  DC-DC Converter Control Circuits
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Maker  HTC [HTC Korea TAEJIN Technology Co.]
Homepage  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

MC34063AD Datasheet(HTML) 11 Page - HTC Korea TAEJIN Technology Co.

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DC-DC Converter Control Circuits
MC34063A
Design Formula Table
Vin(min) - Vsat
Vin(min) - Vsat
Vin + Vsat
fmin
fmin
fmin
Vin(min) - Vsat
Vin(min)-Vsat-Vout
Vin(min) - Vsat
Ipk(switch)
Ipk(switch)
Ipk(switch)
Ipk(switch)(ton + toff)
Vripple(pp)
8Vripple(pp)
Vripple(pp)
TERMS AND DEFINITIONS
Vsat - Saturation voltage of the output switch.
VF - Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
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 IO.
Vripple(p-p) – Desired peack-to-peack output ripple voltage. In practice the calculated capacitor value will need
to be increased due to its equivalent series resistance and board layout. The ripple voltage should
be kept to a low value since it will directly affect the line and load regulation.
May. 2009 - Rev. 1.2
HTC
11 −
Voltage-Inverting
Vout + VF
|Vout| + VF
Calculation
Step-Up
Step-Down
Co
Vout + VF - Vin(min)
1
Rsc
CT
0.3 / Ipk(switch)
() x ton(max)
9
11
toff
L(min)
() x ton(max)
4.0 X 10
-5 ton
4.0 X 10
-5 ton
ton
)
()
+ 1
toff
2Iout(max)
2Iout(max)
(
ton
) x ton(max)
(
+ 1
Iout ton
9
Iout ton
ton/toff
(ton/toff)max
2Iout(max)
Ipk(switch)
4.0 X 10
-5 ton
0.3 / Ipk(switch)
0.3 / Ipk(switch)


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