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MC34063AD Datasheet(PDF) 11 Page - ON Semiconductor

Part No. MC34063AD
Description  1.5 A, Step-Up/Down/ Inverting Switching Regulators
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC34063AD Datasheet(HTML) 11 Page - ON Semiconductor

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MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
http://onsemi.com
11
Calculation
Step−Up
Step−Down
Voltage−Inverting
ton/toff
Vout ) VF * Vin(min)
Vin(min) * Vsat
Vout ) VF
Vin(min) * Vsat * Vout
|Vout| ) VF
Vin * Vsat
(ton + toff)
1
f
1
f
1
f
toff
ton ) toff
ton
toff
) 1
ton ) toff
ton
toff
) 1
ton ) toff
ton
toff
) 1
ton
(ton + toff) − toff
(ton + toff) − toff
(ton + toff) − toff
CT
4.0 x 10−5 ton
4.0 x 10−5 ton
4.0 x 10−5 ton
Ipk(switch)
2Iout(max)
ton
toff
) 1
2Iout(max)
2Iout(max)
ton
toff
) 1
Rsc
0.3/Ipk(switch)
0.3/Ipk(switch)
0.3/Ipk(switch)
L(min)
(Vin(min) * Vsat)
Ipk(switch)
ton(max)
(Vin(min) * Vsat * Vout)
Ipk(switch)
ton(max)
(Vin(min) * Vsat)
Ipk(switch)
ton(max)
CO
9
Ioutton
Vripple(pp)
Ipk(switch)(ton ) toff)
8Vripple(pp)
9
Ioutton
Vripple(pp)
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(pp) − Desired peak−to−peak 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.
NOTE: For further information refer to Application Note AN920A/D and AN954/D.
|Vout| + 1.25 1 )
R2
R1
Figure 17. Design Formula Table


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