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MC34063 View Datasheet(PDF) - ON Semiconductor

Part Name
Description
Manufacturer
MC34063 Datasheet PDF : 15 Pages
First Prev 11 12 13 14 15
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
Calculation
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
Rsc
L(min)
CO
StepUp
StepDown
Vout ) VF * Vin(min)
Vin(min) * Vsat
Vout ) VF
Vin(min) * Vsat * Vout
1
1
f
f
ton ) toff
ton
toff
)
1
(ton + toff) toff
4.0 x 105 ton
ǒ Ǔ 2Iout(max)
ton
toff
)
1
ton ) toff
ton
toff
)
1
(ton + toff) toff
4.0 x 105 ton
2Iout(max)
0.3/Ipk(switch)
ǒ Ǔ (Vin(min) * Vsat)
Ipk(switch)
ton(max)
0.3/Ipk(switch)
ǒ Ǔ (Vin(min) * Vsat * Vout)
Ipk(switch)
ton(max)
9
Ioutton
Vripple(pp)
Ipk(switch)(ton ) toff)
8Vripple(pp)
VoltageInverting
|Vout| ) VF
Vin * Vsat
1
f
ton ) toff
ton
toff
)
1
(ton + toff) toff
4.0 x 105 ton
ǒ Ǔ 2Iout(max)
ton
toff
)
1
0.3/Ipk(switch)
ǒ Ǔ (Vin(min) * Vsat)
Ipk(switch)
ton(max)
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:
ǒ Ǔ Vin Nominal input voltage.
Vout Desired output voltage, |Vout| + 1.25
Iout Desired output current.
1
)
R2
R1
fmin Minimum desired output switching frequency at the selected values of Vin and IO.
Vripple(pp) Desired peaktopeak 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.
Figure 17. Design Formula Table
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