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參數(shù)資料
| 型號(hào)： | MAX749 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | Synchronous 4-Bit Up/Down Binary Counters 16-CFP -55 to 125 |
| 中文描述： | 數(shù)字調(diào)節(jié)LCD偏置電源 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 105K |
| 代理商： | MAX749 |
Figure 9b. Maximum Output Current vs. Input Voltage,
V
OUT
= -12V
Figure 9c. Maximum Output Current vs. Input Voltage,
V
OUT
= -15V
Figure 9d. Maximum Output Current vs. Input Voltage,
V
OUT
= -24V
Figure 9e. Maximum Output Current vs. Input Voltage,
V
OUT
= -48V
Choosing an Induc tor
Practical inductor values range from 22μH to 100μH,
and 47μH is normally a good choice. Inductors with a
ferrite core or equivalent are recommended. The induc-
tor’s saturation current rating – the current at which the
core begins to saturate and the inductance falls to 80%
or 90% of its nominal value – should ideally equal the
current limit (see Current-Sense Resistor section).
However, because the current is limited by the
MAX749, the inductor can safely be driven into satura-
tion with only a slight impact on efficiency.
For highest efficiency, use a coil with low resistance,
preferably under 300m
. To minimize radiated noise,
use a toroid, pot-core, or shielded inductor.
M
Digitally Adjustable LCD Bias S upply
_______________________________________________________________________________________
9
Figure 9a. Maximum Output Current vs. Input Voltage,
V
OUT
= -5V
0
M
INPUT VOLTAGE (V)
M
R
S
)
5
10
15
20
25
3
2
4
5
6
1.0
0.5
0.3
0.25
0.2
V
= -48V
L = 47
μ
H
80
0
2
6
20
60
M
INPUT VOLTAGE (V)
M
4
40
100
120
140
3
5
V
OUT
= -12V
L = 47
μ
H
R
S
)
0.2
0.25
0.3
0.5
1.0
60
0
M
INPUT VOLTAGE (V)
M
6
20
2
4
40
80
100
3
5
R
S
)
V
= -15V
L = 47
μ
H
0.2
0.25
0.3
0.5
1.0
60
0
10
50
M
INPUT VOLTAGE (V)
M
6
30
20
2
4
40
3
5
R
S
)
1.0
0.5
0.3
0.25
0.2
V
= -24V
L = 47
μ
H
0
M
INPUT VOLTAGE (V)
M
R
S
)
50
100
150
200
250
3
2
4
5
6
1.0
0.5
0.3
0.25
0.2
V
= -5V
L = 47
μ
H
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX749CSA | 4-Bit D-type Registers with 3-State Outputs 16-CDIP -55 to 125 |
| MAX749EPA | 4-Bit D-type Registers with 3-State Outputs 20-LCCC -55 to 125 |
| MAX749ESA | Digitally Adjustable LCD Bias Supply |
| MAX7524 | Retriggerable Monostable Multivibrators 16-CFP -55 to 125 |
| MAX7624 | CMOS 8-Bit Buffered Multiplying DACs |
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| MAX7490EEE | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
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