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| 型号： | MIC2843YMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/15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.
MIC2843
High-Current Parallel Operation
The linear drivers are independent of each other, and
can be used individually or paralleled for larger current.
A single WLED can be driven with all six linear drivers by
connecting D1 through D6 together with the cathode of
the WLED as shown in Figure 11. This will generate a
current six times the LED current setting and can be
used for higher current WLEDs such as those used in
flash or torch applications.
Figure 12. Current Response Time to Enable Signal
Turning On (Six Paralleled Channels)
Figure 11. Six-Channel (Parallel) Application Circuit
The current is set by the R SET resistor, and can be
calculated by the following equation:
I LED (mA) = 6 * 410 * D / R SET (k ? ).
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). Figure 12 shows the response
time of the six paralleled linear drivers to the enable
signal, while Figure 13 shows the turn off response. With
a R SET resistor of 1.65k, each linear driver is set to
250mA, with all 6 linear drivers connected in parallel, the
MIC2843 is capable of driving a total current of 1.5A.
Figure 13. Current Response Time to Enable Signal
Turning Off (Six Paralleled Channels)
Input Capacitor
The MIC2843 is a high-performance, high-bandwidth
device. Stability can be maintained using a ceramic input
capacitor of 1μF. Low-ESR ceramic capacitors provide
optimal performance at a minimum amount of space.
Additional high-frequency capacitors, such as small-
valued NPO dielectric-type capacitors, help filter out
high-frequency noise and are good practice in any noise-
sensitive circuit. X5R or X7R dielectrics are
recommended for the input capacitor. Y5V dielectrics
lose most of their capacitance over temperature and are
therefore, not recommended.
November 2010
12
M9999-110810-B
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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 |
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