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

APPLICATIONS

LAYOUT CONSIDERATIONS AND NOISE

DRIVING FEWER THAN SIX LEDS

Because of the ADM8845’s switching behavior, PCB trace layout

is an important consideration. To ensure optimum performance,

a ground plane should be used, and all capacitors (C1, C2, C3,

C4) must be located with minimal track lengths to the pins of

the ADM8845.

The ADM8845 can be operated with fewer than six LEDs in

parallel by simply leaving the unused FBx pins floating or

connected to GND. For example, Figure 28 shows five LEDs

being powered by the ADM8845, and Figure 29 shows three

main LEDs and one sub LED.

WHITE LED SHORTING

If an LED is shorted, the ADM8845 continues to drive the

remaining LEDs with I_LEDper LED (I_LED= I_SET× 120 mA). This

is because the ADM8845 uses six internal currents sinks to

produce the LED current. If an LED is shorted, the ADM8845

continues to sink (I_SET× 120 mA) as programmed by R_SET

through the shorted LED.

LCD

MAIN DISPLAY

SUB DISPLAY

2.6V–5.5V

OUT

ADM8845

CTRL1

CTRL2

ADM8845

FB1

FB2

FB3

FB4

FB5

FB6

FB1

FB2

FB3

FB4

FB5

FB6

CTRL1

CTRL2

GND

SET

Figure 28. Driving Five White LEDs

Figure 29. Driving Three Main LEDs and One Sub LED

MAIN DISPLAY

SUB DISPLAY

2.6V–5.5V

OUT

ADM8845

CTRL1

CTRL2

FB1

FB2

FB3

FB4

FB5

FB6

GND

SET

Figure 30. Typical Application Diagram

Rev. 0 | Page 14 of 20

1...11 12 131415 16 17...20

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