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 FLASH LEDS

DRIVING CAMERA LIGHT, MAIN, AND SUB LEDS

The ADM8845 can be operated with any two FBx pins operated

in parallel to double the combined LED current supplied by the

ADM8845. For example, if three flash LEDs need to be driven

with 60 mA/LED, the ADM8845 can be configured as in

Figure 31 (see also Figure 21).

The ADM8845 can also be configured to power a camera light

that is composed of four white LEDs in parallel, packaged into

one package. FB1 to FB4 now power the camera light, and FB5

and FB6 power the main display. The sub display LED is powered

from the ADM8845 by using an external current mirror to

control the current flowing through the sub white LED (see

Figure 32⁾. All white LEDs have 15 mA/LED, therefore total

load on the ADM8845 charge pump is 105 mA, and the maxi-

mum load on the ADM8845 charge pump is 180 mA (see

Figure 21).

2.6V–5.5V

OUT

ADM8845

60mA 60mA 60mA

FB1

FB2

FB3

FB4

FB5

FB6

CTRL1

CTRL2

GND

SET

4.27kΩ

Figure 31. Driving Three Flash LEDs

1µF

VCC ADM8845

OUT

CHARGE PUMP

1×/1.5×/2× MODE

2.2µF

4.7µF

CAMERA

MAIN

SUB

OSC

CTRL1

CTRL2

15mA/LED

CONTROL

LOGIC

REF

CURRENT

CONTROL7

FB1

FB2

FB3

FB4

FB5

FB6

LED

SET

CURRENT

CONTROL

CIRCUIT

SET

9.44kΩ

CURRENT CONTROLLED SINKS

ꢀ

GND

Figure 32. Driving Camera Light, Two Main LEDs, and One Sub LED

Rev. 0 | Page 15 of 20

1...12 13 141516 17 18...20

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