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| 型号： | MIC4811YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC WHITE LED DVR HC 6CH 10MSOP |
| 标准包装： | 100 |
| 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： | 通用 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 其它名称： | 576-3858-5 |
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PWM signal is applied to the END pin
Micrel Inc.
Application Information
Dynamic Average Matching (DAM?)
The Dynamic average matching architecture multiplexes
four voltage references to provide highly accurate LED
current and channel matching. The MIC4811 achieves
industry leading LED channel matching of 1% across the
entire dimming range.
Ultra Fast PWM? Dimming Interface
The MIC4811 supports a wide range of PWM control
signal frequencies from 200Hz to 500kHz. This
extremely wide range of control provides ultimate
flexibility for handheld applications using high frequency
PWM control signals.
WLED dimming is achieved by pulse width modulating
the linear drivers which are controlled by a PWM signal
to the END pin. For PWM frequencies between 200Hz –
20kHz the MIC4811 supports a duty cycle range from
1% to 100%, see Figure3. The MIC4811 incorporates an
internal shutdown delay to ensure that the internal
control circuitry remains active during PWM dimming.
This feature prevents the possibility of backlight
flickering when using low frequency PWM control
signals. The MIC4811 also supports Ultra Fast PWM?
frequencies from 20kHz to 500kHz. Due to input signal
propagation delay, PWM frequencies above 20kHz have
a non-linear relationship between the duty cycle and the
average LED current, see Figures 4 and 5. Figures 6
through 10 show the WLED current response when a
(1)
MIC4811
Figure 4. Channel Current Response to PWM Control
Signal Frequencies from 50kHz to 500kHz
(1)
From the low Iq sleep mode higher PWM frequencies may require a
logic high enable signal for 60 μ s to first enable the MIC4811 prior to
PWM dimming .
Figure 5. Minimum Duty Cycle
for Varying PWM Frequency
Figure 3. Average Current per LED Dimming
by Changing PWM Duty Cycle for PWM Frequencies
up to 20kHz
April 2011
8
M9999-041411-B
相关PDF资料 |
PDF描述 |
|---|---|
| MIC4812YMME | IC WHITE LED DVR HC 6CH 10MSOP |
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| MIC5013YN | IC DRIVER MOSFET HI/LO SIDE 8DIP |
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| MIC5016BWM | IC DRIVER MOSF DUAL HI/LO 16SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4811YMM TR | 功能描述:LED照明驱动器 High Current Six Channel WLED Driver w/ DAM and Ultrafast 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 |
| MIC4812 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Current 6 Channel Linear WLED Driver with DAM? and Ultra Fast PWM? Control |
| MIC4812_1104 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Current 6 Channel Linear WLED Driver with DAMa?￠ and Ultra Fast PWMa?￠ Control |
| MIC4812YMME | 功能描述:LED照明驱动器 High Current Six Channel WLED Driver w/ DAM and Ultrafast 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 |
| MIC4812YMME TR | 功能描述:LED照明驱动器 High Current Six Channel WLED Driver w/ DAM and Ultrafast 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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