參數(shù)資料
型號(hào)： ADM8845ACP
廠商： ANALOG DEVICES INC
元件分類： 顯示驅(qū)動(dòng)器
英文描述： Charge Pump Driver for LCD White LED Backlights
中文描述： LED DISPLAY DRIVER, QCC16
封裝： 3 X 3 MM, 0.90 MM HEIGHT, LFCSP-16
文件頁(yè)數(shù)： 17/18頁(yè)
文件大?。?/td> 341K
代理商： ADM8845ACP
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 %
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