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參數(shù)資料
| 型號(hào)： | MAX1916 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Dropout, Constant-Current Triple White LED Bias Supply |
| 中文描述： | 低壓差、恒流、三路白光LED偏置電源 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 211K |
| 代理商： | MAX1916 |
Detailed Description
The MAX1916 provides constant-current bias supply
for white LED designs. The MAX1916 uses a single
resistor to set the bias current for up to three LEDs.
LED bias currents are matched to 0.3% by the
MAX1916
’
s unique current-matching architecture
(
Figure 1). Supply current (I
EN
) is a low 40μA in normal
operation and 0.05μA when disabled.
The MAX1916 offers several advantages over using
ballast resistors, such as improved LED-to-LED bright-
ness matching, lower bias variation with supply voltage
changes, significantly lower dropout voltage, and in
some applications, significantly improved efficiency.
The MAX1916 achieves a 200mV dropout with a 9mA
load on each output.
For circuits requiring only one or two LEDs, leave
unused LED outputs unconnected.
Enable Input
EN powers the input of the MAX1916. Drive EN high
(> 2.5V) to enable the device; drive EN low (< 2.2V) to
disable the device. When driven high, EN draws 40μA
to power the IC. Driving EN low forces LED1, LED2,
LED3, and SET into a high-impedance state.
M
Low-Dropout, Constant-Current
Triple White LED Bias Supply
_______________________________________________________________________________________
5
PIN
NAME
FUNCTION
1
EN
Enable Input/Power Input. Drive high (> 2.5V) to enable; drive low (< 2.2V) to disable. When
disabled, SET, LED1, LED2, and LED3 are high impedance. When enabled, EN is the power input
for the MAX1916.
2
GND
Ground
3
SET
Bias Current Set Input. The current flowing into SET sets the bias current into each LED by
I
LED_
= 230 x I
SET
. V
SET
is internally biased to 1.215V. SET is high impedance when EN is low.
4
LED3
LED 3 Cathode Connection. Current flowing into LED3 is 230 times the current flowing into SET.
LED3 is high impedance when EN is low.
5
LED2
LED 2 Cathode Connection. Current flowing into LED2 is 230 times the current flowing into SET.
LED2 is high impedance when EN is low.
6
LED1
LED 1 Cathode Connection. Current flowing into LED1 is 230 times the current flowing into SET.
LED1 is high impedance when EN is low.
Pin Description
MAX1916
ON
EN
OFF
THERMAL
SHUTDOWN
GND
SET
LED1
LED2
LED3
V
CTRL
V+
230X
230X
1.215V
1X
R
SET
UVLO
REF
230X
Figure 1. MAX1916 Simplified Functional Diagram
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1916EZT | 制造商:Maxim Integrated Products 功能描述:LOW-DROPOUT CONSTANT-CURRENT TRIPLE WHITE LED BIAS SUPPLY - Rail/Tube |
| 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照明驅(qū)動(dòng)器 Triple White LED Bias Supply RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1916EZT-T | 功能描述:LED照明驅(qū)動(dòng)器 Triple White LED Bias Supply RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| MAX1917EEE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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