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MC34063AM Datasheet (PDF) 10 Page - ON Semiconductor

Part number MC34063AM
Description  1.5A SWITCHING REGULATOR, 100kHz SWITCHING FREQ-MAX, PDSO8, EIAJ, PLASTIC, SO-8
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Manufacturer  ON Semiconductor
Direct Link  http://www.onsemi.com/PowerSol...
Logo ON Semiconductor

MC34063AM Datasheet (HTML) 10 Page - ON Semiconductor

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MC34063A, MC33063A
Calculation
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
Rsc
L(min)
CO
Step–Up
Vout ) VF * Vin(min)
Vin(min) * Vsat
1
f
ton ) toff
ton
toff
)
1
(ton + toff) – toff
4.0 x 10–5 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)
Step–Down
Vout ) VF
Vin(min) * Vsat * Vout
1
f
ton ) toff
ton
toff
)
1
(ton + toff) – toff
4.0 x 10–5 ton
2Iout(max)
0.3/Ipk(switch)
ǒ Ǔ (Vin(min) * Vsat * Vout)
Ipk(switch)
ton(max)
Ipk(switch)(ton ) toff)
8Vripple(pp)
Voltage–Inverting
|Vout| ) VF
Vin * Vsat
1
f
ton ) toff
ton
toff
)
1
(ton + toff) – toff
4.0 x 10–5 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 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.
Figure 14. Design Formula Table
http://onsemi.com
10

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