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參數(shù)資料
| 型號： | ML4790 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Adjustable Output, Low Ripple Boost Regulator(輸出可調(diào)、小波紋升壓穩(wěn)壓器) |
| 中文描述： | 可調(diào)輸出，低紋波升壓穩(wěn)壓器（輸出可調(diào)，小波紋升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 192K |
| 代理商： | ML4790 |
7
ML4790
efficiency and maximum output current, and if a current
probe is available, look at the inductor current to see if it
looks like the waveform shown in Figure 5.
The DC resistance of the inductor should be kept to a
minimum to reduce losses. A good rule of thumb is to
allow 5 to 10m
of resistance for each
μ
H of inductance.
Also, be aware that the DC resistance of an inductor
usually isn‘t specified tightly, so an inductor with a
maximum DC resistance spec of 150m
may actually
have 100m
of resistance.
Suitable inductors can be purchased from the following
suppliers:
Coilcraft
Coiltronics
(708) 639-6400
(407) 241-7876
Dale
(605) 665-9301
Sumida
(708) 956-0666
BOOST CAPACITOR
The boost capacitor (C2) supplies current to the load
during the ON-time of Q1 and will limit the ripple the
LDO stage has to contend with. The ripple on C2 is
influenced by three capacitor parameters: capacitance,
ESL, and ESR. The contribution due to capacitance can be
determined by looking at the change in the capacitor
voltage required to store the energy delivered by the
inductor in a single charge-discharge cycle, as given by
the following formula:
C
T
V
×
L
V
V
(
V
inFarads
)(
ON
IN
BOOST
OUT
IN
2
2
2
2
≥
×
× ×
–
)
(3)
For example, a 2.4V input, a 5V output, a 22
μ
H inductor,
and an allowance of 100mV of ripple on the boost
capacitor results in a minimum C2 value of 15
μ
F.
Figure 7. Typical Efficiency at maximum output current as a Function of V
IN
.
100
95
90
85
80
75
70
65
60
55
50
1.0
2.0
E
3.0
4.0
5.0
V
IN
(V)
V
OUT =
5.5V
L = 10
μ
H
L = 22
μ
H
L = 47
μ
H
100
95
90
85
80
75
70
65
60
55
50
E
1.0
1.2
1.4
1.6
1.8
2.0
V
OUT =
2.5V
V
IN
(V)
L = 10
μ
H
L = 22
μ
H
L = 47
μ
H
100
95
90
85
80
75
70
65
60
55
50
E
1.0
1.5
2.0
2.5
V
IN
(V)
3.0
3.5
4.0
L = 22
μ
H
V
OUT =
4.5V
L = 10
μ
H
L = 47
μ
H
100
95
90
85
80
75
70
65
60
55
50
1.0
1.5
E
2.0
2.5
3.0
V
IN
(V)
V
OUT =
3.5V
L = 10
μ
H
L = 47
μ
H
L = 22
μ
H
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4790 / 4890 WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4790CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4790ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Adjustable Output, Low Ripple Boost Regulator |
| ML-47F15 | 制造商:Polycase 功能描述:Enclosure;Flanged;PanelMnt;Polycarbonate,UL94VO;Gray;7.63x4.63x3.09 In;ML Series |
| ML-47F1508 | 制造商:Polycase 功能描述:Enclosure;Flanged;Polycarbonate,UL94VO;Gray;7.63x4.63x3.09In;ClearCover;MLSeries |
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