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参数资料
| 型号： | MAX1575ETE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），切换式电容器（充电泵） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
White LED 1x/1.5x Charge Pump
for Main and Sub-Displays
R SET =
Setting the Output Current
The LED current at full (100%) brightness is set (up to
30mA) by a resistor, R SET , as follows:
0.6 V × 234
I LED _
ENM and ENS Dimming Controls
When the LEDs are enabled by driving ENM or ENS
high, the LED current initially goes to I LED_ .
Dimming for the main display is done by pulsing ENM
low (500ns to 500μs pulse width). Dimming for the sub-
display is done by pulsing ENS low (500ns to 500μs
pulse width). Each pulse reduces the LED current by
10%, so after one pulse the LED current is 0.9 x I LED .
The 10th pulse reduces the current by 5% so the LED
current reduces from 0.1 x I LED_ to 0.05 x I LED . The
11th pulse sets the LED current back to I LED_ . Figure 1
shows a timing diagram for EN_.
Because soft-start is longer than intitial t HI , apply dim-
ming pulses quickly upon startup (after initial t HI ) to
avoid LED_ current transitioning through full brightness.
If dimming control is not required, EN_ work as simple
on/off controls. Drive ENM high to enable the main
LEDs, or drive ENM low to turn off the main LEDs. Drive
ENS high to enable the sub-LEDs, or drive ENS low to
turn off the sub-LEDs. Drive both ENM and ENS low to
put the IC in low-power shutdown mode.
Shutdown Mode
When both ENM and ENS are held low for 2ms or longer,
the MAX1575 is shut down and put in a low-current
mode. OUT is internally pulled to GND with 5k Ω during
shutdown.
Overvoltage Protection
If any LED fails as an open circuit, the output voltage is
limited to approximately 5V by gating on/off the charge
pump. In case any LED_ is floating or grounded, the
MAX1575 operates in the same overvoltage-protection
mode. To avoid overvoltage-protection mode when using
fewer than six LEDs, connect any unused LED_ to IN.
Thermal Shutdown
The MAX1575 includes a thermal-limit circuit that shuts
down the IC at approximately +160 ° C. The part turns
on after the IC cools by approximately 20 ° C.
Applications Information
Driving Fewer than Six LEDs
When driving fewer than six LEDs, connect any unused
LED_ directly to IN (Figure 3). When connected in this
manner, the corresponding LED driver is disabled.
Input Ripple
For LED drivers, input ripple is more important than out-
put ripple. Input ripple depends on the source supply’s
impedance. Adding a lowpass filter to the input further
reduces input ripple. Alternately, increasing C IN to 2.2μF
cuts input ripple in half with only a small increase in foot-
print. The 1x mode always has very low input ripple.
INITIAL t HI
≥ 50 μ s
0
1
2
3
4
5
6
7
8
9
10
11
ENM
OR ENS
I LED_
SHDN
t SOFT-START
100%
90%
80%
70%
60%
t LO
500ns TO 500 μ s
50%
t HI
≥ 500ns
40%
30%
20%
10%
5%
100% 90%
t SHDN
2ms (typ)
SHDN
Figure 1. EN_ Timing Diagram
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1575EVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1575 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX1576ETG | 功能描述:LED照明驱动器 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 |
| MAX1576ETG+ | 功能描述:LED照明驱动器 White LED 1/1.5/2x Charge Pump 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 |
| MAX1576ETG+T | 功能描述:LED照明驱动器 White LED 1/1.5/2x Charge Pump 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 |
| MAX1576ETG-T | 功能描述:LED照明驱动器 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 |
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