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参数资料
| 型号： | MAX1916EZT |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | Low-Dropout, Constant-Current Triple White LED Bias Supply |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO6 |
| 封装： | LOW PROFILE, THIN, SOT-23, 6 PIN |
| 文件页数： | 6/7页 |
| 文件大小： | 211K |
| 代理商： | MAX1916EZT |
M
Setting the Output Current
SET controls the LED bias current. Current flowing into
LED1, LED2, and LED3 is 230 times greater than the
current flowing into SET. Set the output current as fol-
lows:
where V
SET
= 1.215V, V
CTRL
is an external voltage
between 1.8V and 5.5V, and R
SET
is the resistor con-
nected between V
CTRL
and SET (
Figure 1).
Applications Information
1) Very Low-Cost, High-Efficiency Solution (Figure 2).
A battery (single Li+ or three NiMH cells) powers
the LEDs directly. This is the least expensive and
most efficient architecture. Due to the high forward
voltage of white LEDs (3.3V), the LED brightness
may dim slightly at the end of battery life. The
MAX1916
’
s current-regulating architecture and low
dropout greatly minimize this effect compared to
using simple ballast resistors. The enable function
of the MAX1916 turns on and off the LEDs. An exist-
ing low-dropout regulator is used as V
CTRL
.
2) Brightness Adjustment Using a DAC (Figure 3). A
DAC is used as V
CTRL
such that the LED brightness
may be dynamically adjusted to eliminate factory
calibration. A battery (single Li+ or three NiMH
cells) or a regulated power source drives the LEDs.
3) Existing 5V Supply (Figure 4). Use an existing sys-
tem regulator, such as the MAX684, to provide the
required LED voltage and provide power to other
circuits. Due to the high forward voltage of white
LEDs (3.3V), use a 3.6V to 5.5V regulated supply to
provide enough voltage headroom such that the
LEDs will maintain constant brightness for any bat-
tery voltage. Use the existing regulated supply as
V
CTRL
.
Chip Information
TRANSISTOR COUNT: 220
PROCESS: BiCMOS
I
V
V
R
LED
CTRL
SET
SET
_
(
)
=
230
Low-Dropout, Constant-Current
Triple White LED Bias Supply
6
_______________________________________________________________________________________
MAX1916
ON
EN
OFF
EXISTING
LDO
GND
SET
LED1 LED2 LED3
V
CTRL
V+
TO OTHER
CIRCUITS
Figure 2. Very Low-Cost, High-Efficiency Solution
MAX1916
ON
EN
OFF
DAC
GND
SET
LED1 LED2
LED3
V
CTRL
V+
Figure 3. Brightness Adjust Using DAC
MAX1916
ON
EN
OFF
EXISTING
REGULATOR
GND
SET
LED1 LED2
LED3
V
BATT
V+
5.0V
TO OTHER
CIRCUITS
Figure 4. Existing 5V Supply Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1916EZT+ | 制造商:Maxim Integrated Products 功能描述:CONSTANT-CURRENT TRIPLE WHITE LED BIAS 制造商:Maxim Integrated Products 功能描述:LED DRVR 3SEGMENT 2.5V TO 5.5V 6PIN SOT-23 - Rail/Tube |
| MAX1916EZT+T | 功能描述:LED照明驱动器 Triple White LED Bias Supply RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX1916EZT-T | 功能描述:LED照明驱动器 Triple White LED Bias Supply RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX1917EEE | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE+ | 功能描述:直流/直流开关转换器 Track/Sink/Source Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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