參數(shù)資料
型號： ADM8845
廠商： Analog Devices, Inc.
英文描述： Charge Pump Driver for LCD White LED Backlights
中文描述： 電荷泵驅動器的液晶顯示白色LED背光源
文件頁數(shù)： 17/18頁
文件大?。?/td> 341K
代理商： ADM8845
Preliminary Technical Data
ADM8845
ADM8845 POWER EFFICIENCY
The ADM8845 power efficiency (
η)
equations, are as follows:
η
= P
OUT
/P
IN
P
IN
= ((V
CC
* I
LOAD
* Gain) + (I
Q
* V
CC
))
Rev. PrJ 06/04| Page 17 of 18
P
OUT
= 6*(V
F
* I
LED
)
I
Q
V
F
Gain
: Quiescent current of the ADM8845, 2.6mA.
: LED Forward Voltage
: Charge Pump Mode (1x, 1.5x, 2x)
Figure 33. ADM8845 Charge Pump Power Efficiency Diagram, Example 1.
Example 1
: The ADM8845 driving six white LED with 20mA/LED
at V
CC
= 3.4V (1.5x mode), LED V
F
= 4.5V.
P
IN
= ((V
CC
* I
LOAD
* Gain) + (V
CC
* I
Q
))
P
IN
= ((3.4 * 120mA
* 1.5) + (3.4 * 2.6mA))
P
IN
= ((0.612) + (0.00884))
P
IN
= 0.62084
P
OUT
= 6(V
F
* I
LED
)
P
OUT
= 6(4.5V * 20mA)
P
OUT
= 0.54
η
= P
OUT
/P
IN
η
= 0.54/0.62084
η
= 87 %
Example 2
: The ADM8845 driving six white LED with 20mA/LED
at V
CC
= 3.4 (1.5x mode), LED V
F
= 3.6V.
P
IN
= ((V
CC
* I
LOAD
* Gain) + (V
CC
* I
Q
))
P
IN
= ((3.4 * 120mA
* 1.5) + (3.4 * 2.6mA))
P
IN
= ((0.612) + (0.00884))
P
IN
= 0.62084
P
OUT
= 6(V
F
* I
LED
)
P
OUT
= 6(3.6V * 20mA)
P
OUT
= 0.432
η
= P
OUT
/P
IN
η
= 0.432/0.62084
η
= 70 %
相關PDF資料
PDF描述
ADM8845ACP Charge Pump Driver for LCD White LED Backlights
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相關代理商/技術參數(shù)
參數(shù)描述
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
ADM8845ACP-REEL7 制造商:Analog Devices 功能描述:Charge Pump STPUP 30mA 16-Pin LFCSP EP T/R
ADM8845ACPZ 制造商:AD 制造商全稱:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights
ADM8845ACPZ-REEL 功能描述:IC LED DRVR WHITE BCKLGT 16LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內部驅動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應商設備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
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