- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374016 > ADM8845ACPZ-REEL7 (ANALOG DEVICES INC) 20-21 (9 Contact) Pin Insert; For Use With:Amphenol MIL-C-5015 97 Series Circular Connectors; No. of Contacts:9; Gender:Male; Operating Voltage:700V PDF資料下載
參數(shù)資料
| 型號： | ADM8845ACPZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 20-21 (9 Contact) Pin Insert; For Use With:Amphenol MIL-C-5015 97 Series Circular Connectors; No. of Contacts:9; Gender:Male; Operating Voltage:700V |
| 中文描述： | LED DISPLAY DRIVER, QCC16 |
| 封裝： | 3 X 3 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, MO-220VEED-2, LFCSP-16 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 341K |
| 代理商： | ADM8845ACPZ-REEL7 |
ADM8845
Preliminary Technical Data
ADM8845 OPERATION
The ADM8845 charge pump driver for LCD white LED backlights implements a multiple gain charge pump (1x, 1.5x, 2x)to maintain the
correct voltage on the anodes of the LEDs over a 2.6V to 5.5V (li-ion) input supply voltage. The charge pump automatically switches
between 1x/1.5x/2x modes based on the input voltage, to maintain sufficient drive for the LED anodes, with V
CC
input voltages as low as
2.6V. It also includes regulation of the charge pump output voltage for supply voltages up to 5.5V. The ADM8845 six LEDs are arranged
into two groups; main and sub. The main display can be up to four LEDs (FB1 to FB4) and the sub display can be up to two LEDs (FB5
and FB6), see Figure 23. Two digital input control pins, CTRL1 and CTRL2, control the shutdown operation and the brightness of the
main and sub displays, see Table 4.
Rev. PrJ 06/04 | Page 10 of 18
CTRL1
0
0
1
1
CTRL2
0
1
0
1
Table 4. ADM8845 Digital Inputs Truth Table
LED Shutdown Operation
Sub Display Off / Main Display Off
Sub Display Off / Main Display On
Sub Display On / Main Display Off
Sub Display On / Main Display On
An external resistor R
SET
is connected between the I
SET
pin and GND, this resistor sets up a reference current I
SET
which is gained up by 120
internally within the ADM8845 to produce the I
LED
currents of up to 30mA/LED, (I
LED
= I
SET
* 120 and I
SET
= 1.18V /R
SET
). The ADM8845
uses six individual current sinks to individually sense each LED current with a maximum matching performance of 1%. This current
matching performance ensures uniform brightness across a color display.
The ADM8845 provides the option to control the brightness of the white LEDs with a digital PWM signal applied to CTRL1 and/or
CTRL2. The duty cycle of the applied PWM signal determines the brightness of the main and/or sub display backlight white LEDs. The
ADM8845 also allows the brightness of the white LEDs to be controlled using a DC voltage, refer to page 14, Figure 27Figure . Soft-start
circuitry limits the inrush current flow at power up. The ADM8845 is fabricated using CMOS technology for minimal power
consumption and is packaged in a 16-Lead Frame Chip Scale Package.
Charge Pump
1x/1.5x/2x mode
Control
Logic
VCC
C4
Osc
Vref
+
-
LED Current
Control
Circuit
Current Controlled Sinks
Iset
GND
ADM8845
Vout
FB2
FB3
FB4
FB5
FB6
FB1
C3
C1
C2
Rset
Current
Co1
Current
2
Current
3
Current
Control
4
Current
5
Current
Control
6
CTRL1
CTRL2
SUB
MAIN
Figure 23. ADM8845 FUNCTIONAL BLOCK DIAGRAM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADM9240 | Low Cost Microprocessor System Hardware Monitor |
| ADM9240ARU | Low Cost Microprocessor System Hardware Monitor |
| ADM9261 | Triple- Power Supply Monitor(3路電源監(jiān)視器) |
| ADM9264ARN-REEL | Quad Power Supply Monitor for Desktop PCs |
| ADM9264ARN-REEL7 | Quad Power Supply Monitor for Desktop PCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM8845ACPZ-REEL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights |
| ADM8845ACPZ-WP1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights |
| ADM8845ACPZ-WP2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Charge Pump Driver for LCD White LED Backlights |
| ADM8845EB-EVALZ | 功能描述:BOARD EVALUATION FOR ADM8845 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅(qū)動器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點:可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| ADM8846ACP | 制造商:Analog Devices 功能描述:CHARGE PUMP DRIVER FOR LCD LED BACKLIGHTS - Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。