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參數(shù)資料
| 型號(hào)： | ML4769ES |
| 英文描述： | 2 Cell, Adjustable Output Boost Regulator with Load Disconnect |
| 中文描述： | 2細(xì)胞，可調(diào)輸出升壓穩(wěn)壓器與負(fù)載斷開(kāi) |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 240K |
| 代理商： | ML4769ES |
ML4769
6
DESIGN CONSIDERATIONS
(Continued)
Figure 4. I
OUT
vs. V
IN
Using the Circuit of Figure 8
Figure 5. Efficiency vs. I
OUT
Using the Circuit of Figure 8
90
80
70
60
E
IOUT (mA)
1
10
100
1000
VOUT = 3V
VOUT = 5.5V
VIN = 2.4V
Figure 6. Input Leakage vs. V
IN
in Shutdown
Figure 7. No Load Input Current vs. V
IN
350
300
250
200
150
100
50
0
I
VIN (V)
1.0
3.0
5.0
7.0
160
120
80
40
0
I
VIN (V)
1.0
2.0
3.0
5.0
4.0
VOUT = 3V
VOUT = 5.5V
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 Q1 turns off, the current in the
output capacitor ramps quickly to between 0.3A and
0.9A. 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 less than
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
I
VIN (V)
1.5
4.5
3.5
5.5
2.5
600
500
400
300
200
100
0
VOUT = 3V
VOUT = 5.5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4769ES UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4769ESX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4770 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect |
| ML4770CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect |
| ML4770ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect |
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