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| 型號(hào)： | MC34166TH |
| 廠(chǎng)商： | ON SEMICONDUCTOR |
| 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： | 6 A SWITCHING REGULATOR, 81 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 16/20頁(yè) |
| 文件大小： | 239K |
| 代理商： | MC34166TH |
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MC34166, MC33166
http://onsemi.com
16
Table 1. Design Equations
Calculation
Step–Down
Step–Up/Down
Voltage–Inverting
ton
toff
(Notes 1, 2)
Vout
VF
Vin
Vsat
Vout
Vout
VF1
VF2
VsatQ2
Vin
VsatQ1
|Vout|
Vin
VF
Vsat
t
on
ton
toff
ton
toff
fosc
1
ton
toff
ton
toff
fosc
1
ton
toff
ton
toff
fosc
1
Duty Cycle
(Note 3)
t
on
f
osc
t
on
f
osc
t
on
f
osc
I
L avg
I
out
Iout
ton
toff
1
Iout
ton
toff
1
I
pk(switch)
IL avg
IL
2
IL avg
IL
2
IL avg
IL
2
L
Vin
Vsat
Vout
IL
ton
Vin
VsatQ1
VsatQ2
IL
ton
Vin
Vsat
IL
ton
V
ripple(pp)
IL
1
8foscCo
2
(ESR)2
ton
toff
1
1
foscCo
2
(ESR)2
ton
toff
1
1
foscCo
2
(ESR)2
V
out
Vref
R2
R1
1
Vref
R2
R1
1
Vref
R2
R1
1
1. V
sat
– Switch Output source saturation voltage, refer to Figure 8.
2. V
F
– Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V.
3. Duty cycle is calculated at the minimum operating input voltage and must not exceed the guaranteed minimum DC
(max)
specification of 0.92.
V
out
–
I
out
–
I
L
–
V
ripple(pp)
–
Desired output voltage.
Desired output current.
Desired peak–to–peak inductor ripple current. For maximum output current especially when the duty cycle is greater than
0.5, it is suggested that
I
L
be chosen to be less than 10% of the average inductor current I
L avg
. This will help prevent
I
pk(switch)
from reaching the guaranteed minimum current limit threshold of 3.3 A. If the design goal is to use a minimum
inductance value, let
I
L
= 2 (I
L avg
). This will proportionally reduce the converter’s output current capability.
Desired peak–to–peak output ripple voltage. For best performance, the ripple voltage should be kept to less than 2% of V
out
.
Capacitor C
O
should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications.
The following converter characteristics must be chosen:
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| MC34166THG | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 40V 3A Buck/Boost/Inverting RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MC34166TV | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 40V 3A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MC34166TVG | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 40V 3A Buck/Boost/Inverting RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MC34167 | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:POWER SWITCHING REGULATORS |
| MC34167_05 | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:5.0 A, Step−Up/Down/Inverting Switching Regulators |
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