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參數(shù)資料
| 型號(hào)： | 33063AP |
| 廠商： | Motorola, Inc. |
| 英文描述： | DC-to-DC CONVERTER CONTROL CIRCUITS |
| 中文描述： | 型DC - DC變換器控制電路 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 200K |
| 代理商： | 33063AP |
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)
Vsat
Vin(min)
Vout
VF
Vin(min)
Vsat
Vout
|Vout|
Vin
VF
Vsat
(ton + toff)
1
f
1
f
1
f
toff
ton
ton
toff
toff
1
ton
ton
toff
toff
1
ton
ton
toff
toff
1
ton
CT
(ton + toff) – toff
4.0 x 10–5 ton
(ton + toff) – toff
4.0 x 10–5 ton
(ton + toff) – toff
4.0 x 10–5 ton
Ipk(switch)
2Iout(max)
ton
toff
1
2Iout(max)
2Iout(max)
ton
toff
1
Rsc
L(min)
0.3/Ipk(switch)
0.3/Ipk(switch)
0.3/Ipk(switch)
(Vin(min)
Ipk(switch)
Vsat)
ton(max)
(Vin(min)
Vsat
Vout)
Ipk(switch)
ton(max)
(Vin(min)
Ipk(switch)
Vsat)
ton(max)
CO
9
Ioutton
Vripple(pp)
Ipk(switch)(ton
8Vripple(pp)
toff)
9
Ioutton
Vripple(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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