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| 型号： | ADM8843ACPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16LFCSP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 200kHz |
| 电源电压： | 2.6 V ~ 5.5 V |
| 输出电压： | 4.81V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 789 (CN2011-ZH PDF) |
| 其它名称： | ADM8843ACPZ-REEL7DKR |
ADM8843
LED BRIGHTNESS CONTROL USING A
PWM SIGNAL APPLIED TO V PWM
Adding two external resistors and a capacitor, as shown in
Figure 21, can also be used for PWM brightness control. This
PWM brightness control method can be used instead of CTRL1
and/or CTRL2 digital PWM brightness control. With this con-
figuration, CTRL1 and CTRL2 digital logic pins can control
shutdown of the white LEDs, and V PWM can control the bright-
ness of all the white LEDs. This is done by applying a high
frequency PWM signal (amplitude 0 V to 2.5 V) to drive an
R-C-R filter on the I SET pin of the ADM8843. A 0% PWM duty
cycle corresponds to 20 mA/LED, and a 100% PWM duty cycle
corresponds to a 0 mA/LED. At PWM frequencies above 5 kHz,
C5 may be reduced (see Figure 21). The amplitude of the PWM
signal must only be 0 V and 2.5 V to result in 20 mA flowing in
each LED.
LED BRIGHTNESS CONTROL USING A DC
VOLTAGE APPLIED TO V BRIGHT
By adding one resistor, as shown in Figure 17, this configuration
can also be used for brightness control of the white LEDs by
using a dc voltage applied to the V BRIGHT node. Figure 22 shows
an application example of LED brightness control using a dc
voltage with an amplitude of 0 V to 2.5 V applied to V BRIGHT .
The equation for I LED is
I SET = [(1/ R SET + 1/ R )( V SET )] – [(1/ R )( V BRIGHT )]
I LED = 120 × I SET
where:
R = 15 kΩ
V SET = voltage at I SET pin (1.18 V)
2.5V
I LED =
I SET _ Voltage
R SET × 2 R
R SET + 2 R
× 120 ×
(1 ? Duty Cycle )
100
V BRIGHT
1.6V
0.8V
0V
20mA
13.6mA
I LED
7.2mA
100% = I LED = 0mA
0% = I LED = 20mA
R = 7.5k Ω R = 7.5k Ω
V PWM
ADM8843
I SET
0mA
Figure 22. PWM Brightness Control Application Diagram Using a
DC Voltage Applied to V BRIGHT
0V–2.5V
C5 = 1 μ F
R SET = 13.4k Ω
Figure 21. PWM Brightness Control Using
Filter-PWM Signal
Rev. C | Page 12 of 16
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| ADM8843ACUZ-REEL7 | 制造商:Analog Devices 功能描述: |
| ADM8843EB-EVALZ | 功能描述:BOARD EVAL ADM8843 RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:- 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| ADM8845 | 制造商:AD 制造商全称:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights |
| ADM8845ACP | 制造商:Analog Devices 功能描述:CHG PUMP STPUP 30MA 16LFCSP - Bulk |
| ADM8845ACP-REEL | 制造商:Analog Devices 功能描述:Charge Pump STPUP 30mA 16-Pin LFCSP EP T/R |
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