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参数资料
| 型号： | ADM8843ACPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/16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
POWER EFFICIENCY
The ADM8843 power efficiency (η) equations are as follows:
η = P OUT / P IN
P IN = (( V CC × I LOAD × Gain ) + ( I Q × V CC ))
P OUT = 4 × ( V F × I LED )
where:
I Q is the quiescent current of the ADM8843, 2.6 mA.
V F is the LED forward voltage.
Gain is the charge pump mode (1×, 1.5×, 2×).
Example 1
The ADM8843 driving four white LED with 20 mA/LED at
V CC = 3.4 V (1.5× mode), LED V F = 4.5 V.
P IN = (( V CC × I LOAD × Gain ) + ( V CC × I Q ))
P IN = ((3.4 × 80 mA × 1.5) + (3.4 × 2.6 mA))
P IN = ((0.408) + (0.00884))
P IN = 0.41684
P OUT = 4( V F × I LED )
P OUT = 4(4.5 V × 20 mA)
P OUT = 0.36
η = P OUT / P IN
η = 0.36/0.41684
η = 87 %
V CC
Example 2
The ADM8843 driving four white LED with 20 mA/LED at
V CC = 3.4 (1.5× mode), LED V F = 3.6 V.
P IN = (( V CC × I LOAD × Gain ) + ( V CC × I Q ))
P IN = ((3.4 × 80 mA × 1.5) + (3.4 × 2.6 mA))
P IN = ((0.408) + (0.00884))
P IN = 0.41684
P OUT = 4( V F × I LED )
P OUT = 4(3.6 V × 20 mA)
P OUT = 0.288
η = P OUT / P IN
η = 0.288/0.41684
η = 70 %
= 3.4V
I IN
V CC
ADM8843
CTRL1
CTRL2
V OUT
FB1
FB2
FB3
FB4
I LOAD
R SET
7.32k Ω
I SET
GND
Figure 30. Charge Pump Power Efficiency Diagram, Example 1
Rev. C | Page 15 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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