- 您现在的位置：买卖IC网 > Datasheet目录343 > MIC2843YMT TR (Micrel Inc)IC LED DRIVER PWM CONTROL 10TMLF Datasheet资料下载
参数资料
| 型号： | MIC2843YMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PWM CONTROL 10TMLF |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 500kHz |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-UFDFN 裸露焊盘，10-TMLF? |
| 供应商设备封装： | 10-TMLF?（2x2） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1082 (CN2011-ZH PDF) |
| 其它名称： | 576-3507-6 |
Micrel Inc.
Functional Description
The MIC2843 is a six-channel WLED driver. The WLED
driver is designed to maintain proper current regulation
with LED current accuracy of 1.5% while the typical
matching between the six channels to be 3% at room
temperature. The WLEDs are driven independently from
MIC2843
R SET
The R SET pin is used by connecting a R SET resistor to
ground to set the peak current of the linear drivers. The
average LED current can be calculated by Equation 1
below:
the input supply and will maintain regulation with a
dropout of 40mV at 20mA. The low dropout of the linear
drivers allows the WLEDs to be driven directly from the
I LED (mA) = 410 × D / R SET (k ? )
Eq. 1
battery voltage and eliminates the need for large and
inefficient charge pumps. The maximum WLED current
for each channel is set via an external resistor. If
dimming is desired the MIC2843 can dim via an Ultra
Fast PWM? signal.
Block Diagram
As shown in Figure 1, the MIC2843 consists of six
current mirrors set to copy a master current determined
by R SET . The linear drivers have a designated control
block for enabling and dimming of the WLEDs. The
MIC2843 is controlled by the PWM control block that
receives PWM signals for dimming.
VIN
The input supply (V IN ) provides power to the linear
drivers and the control circuitry. The V IN operating range
is 3V to 5.5V. Due to wire inductance a minimum bypass
capacitor of 1μF should be placed close to input (VIN)
pin and the ground (GND) pin. Refer to the Layout
Recommendations section for details on placing the
input capacitor (C1).
END
The END pin is equivalent to the enable pin for the linear
drivers on the MIC2843. It can also be used for dimming
using a PWM signal. See the “PWM Dimming Interface”
in the Application Information section for details.
The first pulse on the END pin must be equal or greater
to 40μs to wake the part up in a known state. This
equates to a 12.5kHz PWM signal at equal or greater
than 50% duty cycle. Higher PWM frequencies may be
used but the first pulse must be equal or greater than
40μs.
D is the duty cycle of the LED current during PWM
dimming. When the device is fully on the duty cycle
equals 100% (D = 1). A plot of I LED versus R SET is shown
in Figure 2.
Figure 2. Peak LED Current vs. R SET
D1-D6
The D1 through D6 pins are the linear driver inputs for
WLED 1 through 6, respectively. Connect the anodes of
the WLEDs to V IN and each cathode of the WLEDs to D1
through D6. The linear drivers are independent of each
other.
GND
The ground pin is the ground path for the linear drivers.
The current loop for the ground should be as small as
possible. The ground of the input capacitor should be
routed with low impedance traces to the GND pin and
made as short as possible. Refer to the Layout
Recommendations section for more details.
November 2010
9
M9999-110810-B
相关PDF资料 |
PDF描述 |
|---|---|
| MIC2844AYMT TR | IC LED DRIVR WHITE BCKLGT 10TMLF |
| MIC2845A-MFYMT TR | IC LED DRIVR WHITE BCKLGT 14TMLF |
| MIC2846A-MFYMT TR | IC LED DRIVR WHITE BCKLGT 14TMLF |
| MIC2981/82YWM TR | IC SOURCE DRIVER ARRAY HC 18SOIC |
| MIC2981/82YWM | IC DRIVER ARRAY HV/HC 8CH 18SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2844AYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver with Digital Control 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 |
| MIC2844AYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 单线 调光 20mA 10-TMLF?（2x2） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 类型:线性 拓扑:- 内部开关:是 输出数:6 电压 - 供电（最低）:3V 电压 -?供电（最高）:5.5V 电压 - 输出:- 电流 - 输出/通道:20mA 频率:- 调光:单线 应用:背光，照相机闪光灯 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:10-UFDFN 裸露焊盘，10-TMLF? 供应商器件封装:10-TMLF?（2x2） 标准包装:1 |
| MIC2845A-MFYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM Control 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 |
| MIC2845A-MFYMT-TR | 功能描述:LED 驱动器 IC 6 输出 线性 PWM 调光 20mA 14-TMLF?（2.5x2.5） 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 类型:线性 拓扑:- 内部开关:是 输出数:6 电压 - 供电（最低）:3V 电压 -?供电（最高）:5.5V 电压 - 输出:- 电流 - 输出/通道:20mA 频率:- 调光:PWM 应用:背光，照相机闪光灯 工作温度:-40°C ~ 150°C（TJ） 安装类型:表面贴装 封装/外壳:14-UFQFN 裸露焊盘，14-TMLF? 供应商器件封装:14-TMLF?（2.5x2.5） 标准包装:1 |
| MIC2845A-MGYMT TR | 功能描述:LED照明驱动器 6 Channel Linear WLED Driver + 2 LDOs with PWM Control 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 |
发布紧急采购，3分钟左右您将得到回复。