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參數(shù)資料
| 型號(hào)： | MC33163P |
| 廠(chǎng)商： | MOTOROLA INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 3.4 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | POWER, PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 397K |
| 代理商： | MC33163P |
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MC34163 MC33163
14
MOTOROLA ANALOG IC DEVICE DATA
Figure 27. Design Equations
Calculation
Step–Down
Step–Up
Voltage–Inverting
ton
toff
(Notes 1, 2, 3)
Vout
VF
Vin
Vsat
Vout
Vout
VF– Vin
Vin– Vsat
|Vout|
Vin
VF
Vsat
ton
ton
toff
ton
toff
1
ton
toff
ton
toff
1
ton
toff
ton
toff
1
CT
32.143 · 10–6
32.143 · 10–6
32.143 · 10–6
IL(avg)
Iout
Iout
ton
toff
1
Iout
ton
toff
1
Ipk (Switch)
IL(avg)
IL
2
IL(avg)
IL
2
IL(avg)
IL
2
RSC
0.25
Ipk (Switch)
0.25
Ipk (Switch)
0.25
Ipk (Switch)
L
Vin
Vsat
Vout
IL
ton
Vin
Vsat
IL
ton
Vin
Vsat
IL
ton
Vripple(pp)
IL
1
8 CO
2
(ESR)2
tonIout
CO
tonIout
CO
Vout
Vref
R2
R1
1
Vref
R2
R1
1
Vref
R2
R1
1
Vin –
Vout –
Iout –
IL –
–
Vripple(pp) –
Nominal operating input voltage.
Desired output voltage.
Desired output current.
Desired peak–to–peak inductor ripple current. For maximum output current it is suggested that
IL be chosen to be less
than 10% of the average inductor current IL(avg). This will help prevent Ipk (Switch) from reaching the current limit threshold
set by RSC. If the design goal is to use a minimum inductance value, let
IL = 2(IL(avg)). This will proportionally reduce
converter output current capability.
Maximum output switch frequency.
Desired peak–to–peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since
it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic
designed for switching regulator applications.
The following Converter Characteristics must be chosen:
NOTES:
1. Vsat – Saturation voltage of the output switch, refer to Figures 7 and 8.
NOTES:
2. VF – Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V.
NOTES:
3. The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio of 8, at the minimum
NOTES:
3.
operating input voltage.
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