参数资料
型号: MIC2845A-MFYMT TR
厂商: Micrel Inc
文件页数: 13/18页
文件大小: 0K
描述: IC LED DRIVR WHITE BCKLGT 14TMLF
标准包装: 1
恒定电流:
拓扑: 线性(LDO),PWM
输出数: 6
内部驱动器:
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: 14-UFQFN 裸露焊盘,14-TMLF?
供应商设备封装: 14-TMLF?(2.5x2.5)
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: 576-3474-6
Micrel Inc.
Figure 7. PWM Signal at 20% Duty Cycle (I avg = 4mA)
MIC2845A
Figure 10. PWM Signal at 100% Duty Cycle (I avg = 20mA)
High Current Parallel Operation
Figure 8. PWM Signal at 50% Duty Cycle (I avg = 10mA)
Figure 11. Six Channel (Parallel) Application Circuit
The linear drivers are independent of each other and can
be used individually or paralleled to provide larger
current. A single LED can be driven with all 6 linear
drivers by connecting D1 through D6 together with the
cathode of the LED as shown in Figure 11. This will
generate a current 6 times the LED current setting and
can be used for higher current LEDs such as those used
in flash or torch applications. 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
Figure 9. PWM Signal at 80% Duty Cycle (I avg = 16mA)
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.
April 2010
13
M9999-041210-C
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