參數(shù)資料
型號(hào): MC33063A
廠商: ON SEMICONDUCTOR
英文描述: DC-to-DC Converter Control Circuits
中文描述: 型DC - DC轉(zhuǎn)換器控制電路
文件頁(yè)數(shù): 10/16頁(yè)
文件大小: 149K
代理商: MC33063A
MC34063A, MC33063A
http://onsemi.com
10
Calculation
Step–Up
Step–Down
Voltage–Inverting
t
on
/t
off
Vout
VF
Vin(min)
Vsat
Vin(min)
Vout
VF
Vin(min)
Vsat
Vout
|Vout|
Vin
VF
Vsat
(t
on
+ t
off
)
1
f
1
f
1
f
t
off
ton
ton
toff
(t
on
+ t
off
) – t
off
4.0 x 10
–5
t
on
toff
1
ton
ton
toff
toff
1
ton
ton
toff
(t
on
+ t
off
) – t
off
4.0 x 10
–5
t
on
toff
1
t
on
(t
on
+ t
off
) – t
off
4.0 x 10
–5
t
on
C
T
I
pk(switch)
2Iout(max)
ton
toff
1
2Iout(max)
2Iout(max)
ton
toff
1
R
sc
0.3/I
pk(switch)
0.3/I
pk(switch)
0.3/I
pk(switch)
L
(min)
(Vin(min)
Ipk(switch)
Vsat)
ton(max)
(Vin(min)
Vsat
Vout)
Ipk(switch)
ton(max)
(Vin(min)
Ipk(switch)
Vsat)
ton(max)
C
O
9
Ioutton
Vripple(pp)
Ipk(switch)(ton
8Vripple(pp)
toff)
9
Ioutton
Vripple(pp)
V
sat
= Saturation voltage of the output switch.
V
F
= Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
V
in
– Nominal input voltage.
V
out
– Desired output voltage,
I
out
– Desired output current.
f
min
– Minimum desired output switching frequency at the selected values of V
in
and I
O
.
V
ripple(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.
|V
out
|
1.25 1
R2
R1
Figure 14. Design Formula Table
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