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參數(shù)資料
| 型號(hào)： | ADM8845ACPZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顯示驅(qū)動(dòng)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(yè)數(shù)： | 14/18頁(yè) |
| 文件大小： | 341K |
| 代理商： | ADM8845ACPZ-REEL7 |
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ADM8845
Preliminary Technical Data
ADM8845 LED BRIGHTNESS CONTROL USING A
PWM SIGNAL APPLIED TO V
PWM
Adding two external resistors and a capacitor as shown on
Figure 26, can also be used to achieve PWM brightness control.
This PWM brightness control method can be used instead of
CTRL1 and/or CTRL2 digital PWM brightness control. With
this configuration, CTRL1 and CTRL2 digital logic pins can be
used to control shutdown of the white LEDs, while V
PWM
can be
used to control the brightness of all the white LEDs. By applying
a high-frequency PWM signal (Amplitude 0V to 2.5V) to drive
an R-C-R filter on the I
SET
pin of the ADM8845. A 0% PWM
duty cycle corresponds to 20mA/LED, while a 100% PWM duty
cycle corresponds to a 0mA/LED. At PWM frequencies above
5kHz, C5 may be reduced. Refer to Figure 26, ADM8845 PWM
Brightness Control Using Filtered-PWM Signal. The amplitude
of the PWM signal must be 0 V and 2.5 V only, in order to have
20mA flowing in each LED.
Rev. PrJ 06/04 | Page 14 of 18
#8#####9 ,)04
###:##:#%##!1#1,4(
#######:#
#########
-#8#
#8#
####-#8#
#8#
6
;<6
##.
#8#=
#8#".>
#8#".>#
#8#.>
Figure 26. ADM8845 PWM Brightness Control Using Filtered-
PWM Signal
ADM8845 LED BRIGHTNESS CONTROL USING A
DC VOLTAGE APPLIED TO V
BRIGHT
Adding one resistor as shown in figure 27 , this configuration
can also be used to achieve brightness control of the white LEDs
using a DC voltage applied to the V
BRIGHT
node. Figure 28 shows
an application example of LED Brightness control using a DC
Voltage with a amplitude of 0V to 2.5V, applied to V
BRIGHT
.
6
7
#8#>
#8#.>
##.
Figure 27. ADM8845 PWM Brightness Control Using a DC
Voltage applied to VBRIGHT
The equation for I
LED
is:
I
SET
= [(1/R
SET
+ 1/R)(V
SET
)] – [(1/R)(V
BRIGHT
)]
I
LED
= 120*I
SET
Where R = 15k Ohm, V
SET
= voltage at I
SET
pin (1.18V)
7
.
.
.
".
.
Figure 28. ADM8845 PWM Brightness Control Application
Diagram Using a DC Voltage applied to V
BRIGHT
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| ADM8845EB-EVALZ | 功能描述:BOARD EVALUATION FOR ADM8845 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - LED 驅(qū)動(dòng)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(diǎn):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 |
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