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| 型号： | MIC4801YM |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC WHITE LED DVR 600MA 1CH 8SOIC |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 1 |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 其它名称： | 576-3856-5 |
Micrel Inc.
Application Information
LED Current
MIC4801
Ultra Fast PWM? Dimming Interface
The MIC4801 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 applying a pulse width
modulated (PWM) signal to the EN pin. For PWM
frequencies between 200Hz – 10kHz the MIC4801
900
800
700
600
500
400
300
200
vs. PWM Duty Cycle
f PWM = 20kHz
f PWM = 100kHz
f PWM = 200kHz
supports a duty cycle range from 1% to 100%, as shown
in Figure 3. The MIC4801 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
100
0
0
20
f PWM = 500kHz
40 60 80
DUTY CYCLE (%)
100
when using low frequency PWM control signals. The
MIC4801 also supports Ultra Fast PWM? frequencies
from 20kHz to 500kHz. Due to input signal propagation
Figure 4. Channel Current Response to PWM Control
Signal Frequencies from 50kHz to 500kHz
delay, PWM frequencies above 20kHz have a non-linear
relationship between the duty cycle and the average
LED current, as shown in Figure 3 and 4. Figures 6
through 9 show the WLED current response when a
PWM signal is applied to the EN pin (1) .
35
30
Minimum Duty Cycle
vs. Frequency
(1)
From the low I Q sleep mode higher PWM frequencies require a logic
25
high enable signal for 60 μ s to first enable the MIC4801 prior to PWM
dimming.
LED Current
vs. PWM Duty Cycle
20
15
10
900
800
700
600
500
VIN = 5V
f PWM = 5kHz
f PWM = 1kHz
5
0
100
1000 10000 100000
FREQUENCY (Hz)
1000000
400
300
200
100
0
f PWM = 10kHz
Figure 5. Minimum Duty Cycle
for Varying PWM Frequency
0
20
40
60
80
100
DUTY CYCLE (%)
Figure 3. Average Current per LED Dimming
by Changing PWM Duty Cycle for PWM Frequencies
up to 20kHz
Figure 6. PWM Signal at 1% Duty Cycle (I avg = 6mA)
January 2011
8
M9999-011811-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4801YM TR | 功能描述:LED照明驱动器 600mA Single Channel WLED Driver w/ 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 |
| MIC4801YM-TR | 功能描述:LED 驱动器 IC 1 输出 线性 PWM 调光 600mA 8-SOIC 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:1 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:600mA 频率:- 调光:PWM 应用:照明 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:1 |
| MIC4802 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Efficiency 800mA Single Channel Linear WLED Driver with Ultra Fast PWM? Control |
| MIC4802YME | 功能描述:LED照明驱动器 800mA Single Channel WLED Driver w/ 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 |
| MIC4802YME TR | 功能描述:LED照明驱动器 800mA Single Channel WLED Driver w/ 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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