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MC34063AP1 데이터시트(Datasheet) 10 Page - ON Semiconductor

부품명 MC34063AP1
상세내용  1.5 A, Step−Up/Down/ Inverting Switching Regulators
PDF  13 Pages
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제조사  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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MC34063A, MC33063A, NCV33063A
http://onsemi.com
10
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 15. Design Formula Table




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