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參數(shù)資料
| 型號： | ML4872 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator with Shutdown(帶關(guān)斷電路的大電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓關(guān)斷穩(wěn)壓器（帶關(guān)斷電路的大電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 196K |
| 代理商： | ML4872 |
6
ML4872
OUTPUT CAPACITOR
The output capacitor filters the pulses of current from the
switching regulator. Since the switching frequency will
vary with inductance, the minimum output capacitance
required to reduce the output ripple to an acceptable
level will be a function of the inductor used. Therefore, to
maintain an output voltage with less than 100mV of ripple
at full load current, use the following equation:
C
L
V
OUT
OUT
=
44
(2)
The output capacitor’s Equivalent Series Resistance (ESR)
and Equivalent Series Inductance (ESL), also contribute to
the ripple. Just after the NMOS transistor, Q1, turns off,
the current in the output capacitor ramps quickly to
between 0.5A and 1.5A. This fast change in current
through the capacitor’s ESL causes a high frequency (5ns)
spike to appear on the output. After the ESL spike settles,
the output still has a ripple component equal to the
inductor discharge current times the ESR. To minimize
these effects, choose an output capacitor with less than
10nH of ESL and 100m
W
of ESR.
Suitable tantalum capacitors can be obtained from the
following vendors:
AVX
(207) 282-5111
Kemet
(846) 963-6300
Sprague
(207) 324-4140
Figure 5. Efficiency vs. I
OUT
Using the Circuit of Figure 8
Figure 4. I
OUT
vs. VIN Using the Circuit of Figure 8
Figure 6. No Load Input Current vs. V
IN
DESIGN CONSIDERATIONS
(Continued)
1000
800
600
400
200
0
I
VIN (V)
1.0
2.0
3.0
5.0
4.0
VOUT = 3.3V
VOUT = 5V
90
80
70
60
E
IOUT (mA)
1
10
100
1000
VOUT = 3.3V
VOUT = 5V
VIN = 2.4V
90
60
30
0
I
VIN (V)
1.0
2.0
3.0
5.0
4.0
VOUT = 3.3V
VOUT = 5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4872CS3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4872CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator with Shutdown |
| ML4872CS3X | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4872CS5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4872CS-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator with Shutdown |
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