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MC33063ADR2G データシート(PDF) 11 Page - ON Semiconductor

部品番号 MC33063ADR2G
部品情報  1.5 A, Step-Up/Down/Inverting Switching Regulators
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メーカー  ONSEMI [ON Semiconductor]
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MC33063ADR2G データシート(HTML) 11 Page - ON Semiconductor

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MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
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11
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 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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