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參數(shù)資料
| 型號： | MAX651 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3V or Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Controllers(3.3V/可調(diào),高效率,低IQ值,步降DC-DC控制器) |
| 中文描述： | 5V/3.3V/3V或可調(diào)、高效率、低IQ、降壓型DC-DC控制器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 172K |
| 代理商： | MAX651 |
M
5V /3.3V /3V or Adjustable, High-Effic ienc y,
Low I
Q
, S tep-Down DC-DC Controllers
_______________________________________________________________________________________
9
inductor, and the control circuit adjusts the switch duty
cycle to maintain regulation without exceeding the
switch current capability (Figure 3a). This provides
excellent load-transient response and high efficiency.
In discontinuous-conduction mode (DCM), current
through the inductor starts at zero, rises to a peak
value, then ramps down to zero. Although efficiency is
still excellent, the output ripple increases slightly, and
the switch waveforms exhibit ringing (the self-resonant
frequency of the inductor). This ringing is to be expect-
ed and poses no operational problems.
Dropout
The MAX649/MAX651/MAX652 are said to be in
dropout when the input voltage (V+) is low enough
that the output drops below the minimum output
voltage specification (see Electrical Characteristics).
The dropout voltage is the difference between the
input and output voltage when dropout occurs.
See the Typical Operating Characteristics for the
Dropout Voltage vs. Load Current and Dropout Voltage
vs. Temperature graphs.
V+ = 10V, I
LOAD
= 1.3A
CIRCUIT OF FIGURE 1, R1 = 150m
1.5A
0A
1A
2
μ
s/div
Figure 3a. MAX649 Continuous-Conduction Mode, Heavy
Load-Current Waveform (500mA/div)
V+ = 10V, I
LOAD
= 1.4A
CIRCUIT OF FIGURE 1, R1 = 100m
2.5A
0A
1.5A
0.5A
1.0A
2.0A
5
μ
s/div
Figure 3b. MAX649 Light/Medium Load-Current Waveform
(500mA/div)
(
)
MAX649
MAX651
MAX652
V+
CS
GND
5
6
2
8
3
V
IN
C2
330
μ
F
7
1
EXT
OUT
SHDN
4
C3
0.1
μ
F
C4
0.1
μ
F
C1
100
μ
F
R1
0.1
D1
1N5820
L1
22
μ
H
P1
Si9430
OUTPUT
@ 1.5A
REF
FB
R2
R3
150k
R2 = R3
V
OUT
V
REF
– 1
V
REF
= 1.5V
Figure 4. Adjustable-Output Operation
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
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| MAX6510CAUT-T | 功能描述:板上安裝溫度傳感器 Resistor-Prog Temperature Switch RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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