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| 型号： | MIC4812YMME |
| 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）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 管件 |
| 其它名称： | 576-3859-5 |
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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 MIC4812 achieves
industry leading LED channel matching of 1% across the
entire dimming range.
Ultra Fast PWM? Dimming Interface
The MIC4812 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 EN pin. For PWM frequencies between 200Hz –
20kHz the MIC4812 supports a duty cycle range from
1% to 100%, see Figure 3. The MIC4812 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 MIC4812 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)
MIC4812
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 MIC4812 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
M9999-041419-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MIC4826 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Input Voltage, 160VPP Output Voltage, EL Driver |
| MIC4826_09 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Low Input Voltage, 160VPP Output Voltage, EL Driver |
| MIC4826BMM | 功能描述:IC EL DRIVER 160VPP OUT 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
| MIC4826BMM TR | 功能描述:IC DRIVER EL DC-AC 160VPP 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
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