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| 型号： | MIC4802YME |
| 厂商： | Micrel Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC WHITE LED DVR 800MA 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 Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 管件 |
| 其它名称： | 576-3857-5 |
Micrel Inc.
MIC4802
VIN
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).
EN
The EN pin is equivalent to the enable pin for the linear
drivers on the MIC4802. It can also be used for dimming
applying a PWM signal. See the PWM Dimming
1000
100
10
Peak LED Current
vs. R SET
Interface in the Application Information section for
details. Pulling the EN low for more than 40ms puts the
1
1
10
100
1000
10000
MIC4802 into a low I Q sleep mode. The EN pin cannot be
left floating; a floating enable pin may cause an
indeterminate state on the outputs. The first pulse on the EN
pin must be equal or greater than 60μs to wake the part up
in a known state. This equates to an 8.3kHz PWM signal at
equal or greater than 50% duty cycle. Higher PWM
frequencies may be used but the first pulse must be equal or
greater than 60μs.
RSET
The R SET pin is used to set the peak current of the linear
driver by connecting a R SET resistor to ground. The
theoretical average LED current can be estimated by
equation (1):
I LED (mA) = 4920 * D / R SET (k ? ) (1)
R SET (k ? ) = 4920 * D / I LED (mA) (2)
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.
Due to DC losses across current paths internal and
external to the package, the calculated R SET resistance
equation is modified by a factor K, where K is calculated
to be 0.280k ? .
RSET (k ? )
Figure 2. Peak LED Current vs. R SET
D1
The D1 pins are the linear driver inputs for the LED.
Connect the anode of the LED to VIN and the cathode to
the D1 pins. All the D1 pins must be connected together.
The D1 voltage at dropout is the minimum voltage
required by the linear driver in order for the LED to be
fully biased.
GND
The ground pin is the ground path for the linear driver.
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.
R SET (k ? ) = 4920 * D / I LED (mA) + 0.280 (k ? )
I LED (mA) = 4920 * D / ((R SET (k ? ) – 0.280 (k ? ))
(3)
(4)
The modified LED current equation is more accurate in
determining the actual LED current based on the RSET
resistor value.
January 2011
7
M9999-013111-B
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相关代理商/技术参数 |
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| 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 |
| MIC4802YME-TR | 功能描述:LED 驱动器 IC 1 输出 线性 PWM 调光 800mA 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:800mA 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）裸焊盘 供应商器件封装:8-SOIC 标准包装:1 |
| MIC4807 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:80V 8-Channel Addressable Low-Side Driver |
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| MIC4811 | 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 |
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