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MC33063AVD Arkusz danych(PDF) 9 Page - ON Semiconductor

Numer części MC33063AVD
Szczegółowy opis  DC-to-DC CONVERTER CONTROL CIRCUITS
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MC34063A MC33063A
9
MOTOROLA ANALOG IC DEVICE DATA
Figure 14. Design Formula Table
Calculation
Step–Up
Step–Down
Voltage–Inverting
ton/toff
Vout ) VF * Vin(min)
V
in(min) *
Vsat
Vout ) VF
V
in(min) *
Vsat * Vout
|Vout| ) VF
V
in *
Vsat
(ton + toff)
1
f
1
f
1
f
toff
ton ) toff
ton
t
off
) 1
ton ) toff
ton
t
off
) 1
ton ) toff
ton
t
off
) 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)
2I
out(max)
ton
t
off
) 1
2I
out(max)
2I
out(max)
ton
t
off
) 1
Rsc
0.3/Ipk(switch)
0.3/Ipk(switch)
0.3/Ipk(switch)
L(min)
(V
in(min) *
Vsat)
I
pk(switch)
t
on(max)
(V
in(min) *
Vsat * Vout)
I
pk(switch)
t
on(max)
(V
in(min) *
Vsat)
I
pk(switch)
t
on(max)
CO
9
Ioutton
V
ripple(pp)
I
pk(switch)
(ton ) toff)
8V
ripple(pp)
9
Ioutton
V
ripple(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
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.
|Vout| + 1.25 1 )
R2
R1


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