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| 型号： | MIC2845A-MFYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 14TMLF |
| 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： | 14-UFQFN 裸露焊盘，14-TMLF? |
| 供应商设备封装： | 14-TMLF?（2.5x2.5） |
| 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： | 576-3474-6 |
Micrel Inc.
V IN
The input supply (V IN ) provides power to the linear LED
drivers and the control circuitry. The V IN operating range
is 3V to 5.5V. A minimum bypass capacitor of 1μF
should be placed close to the input (VIN) pin and the
ground (GND) pin. Refer to the layout recommendations
section for details on placing the input capacitor (C1).
LDO1/LDO2
The output pins for LDO one and LDO two are labeled
LDO1 and LDO2, respectively. A minimum of 1μF
bypass capacitor should be placed as close as possible
to the output pin of each LDO. Refer to the layout
recommendations section for details on placing the
output capacitor (C2, C3) of the LDOs.
EN1/EN2
A logic high signal on the enable pin activates the LDO
output voltage of the device. A logic low signal on the
enable pin deactivates the output and reduces supply
current to less than 1μA. EN1 controls LDO1 and EN2
controls LDO2. Do not leave these control pins floating.
END
The END pin is equivalent to the enable pin for the linear
drivers on the MIC2845A. It can also be used for
dimming applying a PWM signal. See the PWM Dimming
Interface in the Application Information section for
details. Pulling the END low for more than 24ms puts the
MIC2845A into a low Iq sleep mode. The END pin cannot
be left floating; a floating enable pin may cause an
indeterminate state on the outputs. A 200k ? pull down
resistor is recommended.
R SET
The R SET pin is used to set the peak current of the linear
driver by connecting a R SET resistor to ground. The
average LED current can be calculated by equation (1):
I LED (mA) = 410 * D / R SET (k ? ) (1)
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.
MIC2845A
Figure 2. Peak LED Current vs. R SET
D1-D6
The D1 through D6 pins are the linear driver for LED 1
through 6, respectively. Connect the anodes of the LEDs
to V IN and each cathode of the LEDs to D1 through D6.
When operating with less than six LEDs, leave the
unused D pins unconnected. The six LED channels are
independent of one another and may be combined or
used separately.
GND
The ground pin is the ground path for the linear drivers
and LDOs. 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 for more details.
April 2010
11
M9999-041210-C
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相关代理商/技术参数 |
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| 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 |
| MIC2845A-MGYMT-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-PGYMT 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-PGYMT-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-PPYMT 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 |
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