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MC34063A View Datasheet(PDF) - Motorola => Freescale

Part Name
Description
View to exact match
MC34063A
Motorola
Motorola => Freescale Motorola
MC34063A Datasheet PDF : 12 Pages
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MC34063A MC33063A
Calculation
ton/toff
(ton + toff)
toff
ton
CT
Ipk(switch)
Rsc
L(min)
CO
Figure 14. Design Formula Table
Step–Up
) * Vout VF
* Vin(min)
Vin(min)
Vsat
Step–Down
) Vout VF
* * Vin(min) Vsat Vout
1
f
) ton toff
) ton
toff
1
(ton + toff) – toff
ǒ ) Ǔ 4.0 x 10–5 ton
2Iout(max)
ton
toff
1
ǒ * Ǔ0.3/Ipk(switch)
(Vin(min) Vsat)
Ipk(switch)
ton(max)
9
Ioutton
Vripple(pp)
1
f
) ton toff
) ton
toff
1
(ton + toff) – toff
4.0 x 10–5 ton
2Iout(max)
ǒ * * Ǔ 0.3/Ipk(switch)
(Vin(min) Vsat
Ipk(switch)
Vout)
ton(max)
) Ipk(switch)(ton toff)
8Vripple(pp)
Voltage–Inverting
) |Vout| VF
* Vin Vsat
1
f
) ton toff
) ton
toff
1
(ton + toff) – toff
ǒ ) Ǔ 4.0 x 10–5 ton
2Iout(max)
ton
toff
1
ǒ * Ǔ0.3/Ipk(switch)
(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.
+ ǒ ) Ǔ The following power supply characteristics must be chosen:
Vin – Nominal input voltage.
Vout – Desired output voltage, |Vout|
Iout – Desired output current.
1.25 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
Vripple(pp) – 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.
MOTOROLA ANALOG IC DEVICE DATA
9
 

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