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

DRIVING FOUR BACKLIGHT WHITE LEDS AND FLASH LEDS

The ADM8845 also can be configured to power four backlight

white LEDs and a camera flash, packaged into one package. FB1

to FB4 power the backlight light, FB5 and FB6 powers the two

of the flash LEDs, and the third is powered an external current

mirror to control the current flowing through the third flash LED

(see Figure 33). All the backlight white LEDs have 15 mA/LED,

and the flash current is 20 mA/LED. The total load on the

ADM8845 charge pump is 120 mA; the maximum load on

the ADM8845 charge pump is 180 mA (see Figure 21).

CTRL1 controls the flash on/off, and CTRL2 controls the back-

light on/off and brightness control. Because the R_SETresistor sets

the current that each of the six current control blocks can sink,

a PWM signal is used to change the current in the backlight

from 20 mA to 5 mA/LED. The CTRL2 duty cycle is 15/20 to

give 15 mA/backlight LED.

1µF

ADM8845

OUT

CHARGE PUMP

1×/1.5×/2× MODE

4.7µF

2.2µF

BACK-

LIGHT

FLASH

CTRL1

OSC

15mA/LED

20mA/LED

CONTROL

LOGIC

REF

CTRL2

CURRENT

CONTROL 7

FB1

FB2

FB3

FB4

FB5

FB6

LED

SET

CURRENT

CONTROL

CIRCUIT

SET

7.32kΩ

CURRENT CONTROLLED SINKS

GND

Figure 33. Driving Four Backlight LEDs and Flash LED

Rev. 0 | Page 16 of 20

1...13 14 151617 18 19 20

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