Datasheet > ADM8845ACPZ-WP2

ADM8845ACPZ-WP2

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
亚德诺 - ADI		驱动器泵
页数	文件大小	规格书
20页	372K
描述
Charge Pump Driver for LCD White LED Backlights

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中文翻译

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数据手册

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ADM8845ACPZ-WP2 数据手册

ADM8845

POWER EFFICIENCY

The ADM8845 power efficiency (η) equations are

Example 1

The ADM8845 driving six white LED with 20 mA/LED at

η = P_OUT/P_IN

_IN= ((V_CC× I_LOAD× Gain) + (I_Q× V_CC))

V_CC= 3.4 V (1.5× mode), LED V_F= 4.5 V.

_OUT= 6×(V_F× I_LED

)

_IN= ((V_CC× I_LOAD× Gain) + (V_CC× I_Q))

_IN= ((3.4 × 120 mA × 1.5) + (3.4 × 2.6 mA))

_IN= ((0.612) + (0.00884))

where:

I_Qis the quiescent current of the ADM8845, 2.6 mA.

V_Fis the LED forward voltage.

_IN= 0.62084

Gain is equal to charge pump mode (1×, 1.5×, 2×).

3.4V

_OUT= 6(V_F× I_LED

)

LOAD

_OUT= 6(4.5V × 20 mA)

OUT

P_OUT= 0.54

ADM8845

η = P_OUT/P_IN

η = 0.54/0.62084

η = 87 %

CTRL1

CTRL2

FB1

FB2

FB3

FB4

FB5

FB6

Example 2

SET

GND

The ADM8845 driving six white LED with 20 mA/LED at

V_CC= 3.4 (1.5× mode), LED V_F= 3.6 V.

SET

_IN= ((V_CC× I_LOAD× Gain) + (V_CC× I_Q))

_IN= ((3.4 × 120 mA × 1.5) + (3.4 × 2.6 mA))

_IN= ((0.612) + (0.00884))

Figure 34. Charge Pump Power Efficiency Diagram

Examples 1 and 2 show calculations of the ADM8845 power

efficiency; also see Figure 34.

_IN= 0.62084

_OUT= 6(V_F× I_LED)

_OUT= 6(3.6 V × 20 mA)

_OUT= 0.432

η = P_OUT/P_IN

η = 0.432/0.62084

η = 70 %

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