參數(shù)資料
型號(hào)： LP55271TL
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 顯示驅(qū)動(dòng)器
英文描述： Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
中文描述： LED DISPLAY DRIVER, PBGA30
封裝： 2.5 X 3 MM, 0.60 MM HEIGHT, BGA-30
文件頁(yè)數(shù)： 12/21頁(yè)
文件大?。?/td> 826K
代理商： LP55271TL
Constant Current Sink Outputs LED1, LED2, LED3, LED4
LP55271 has four independent backlight/keypad LED driv-
ers. All the drivers are regulated constant current sinks. LED
currents are controlled by 8-bit current mode DACs. Every
driver can be controlled in two ways:
1.
Brightness control with constant current drivers
2.
Direct ON/OFF control. The current is pre-set by 8-bit
current mode DAC.
In addition, LED1 driver can be synchronized to audio input
signal amplitude.
By using brightness control user can set brightness of every
single LED by using 8-bit brightness control registers. If
analog audio is available on system the user can use audio
synchronization for synchronizing LED1 to the music. Direct
ON/OFF control is mainly for switching LEDs on and off.
LED Control Register (00 hex) has control bits for direct
on/off control of all the LEDs. Note that the LEDs have to be
turned on in order to control them with audio synchronization
(LED1 only) or brightness control.
The brightness is programmed as described in the following.
I
LED
= n x (15 mA / 255)
where:
n = LED[7:0] (8-bit)
step = 15 mA / 255
≈
0.05882 mA
For example if 13.2 mA is required for driver current:
n = 13.2 mA / (15 mA / 255)
≈
224
224 = 1110 0000, E0 hex
LED1 to LED4 Brightness Control
LED1[7:0], LED2[7:0], LED3[7:0] and LED4[7:0] Registers
0000 0000
0000 0001
0000 0010
1110 0000
1111 1110
1111 1111
Driver Current, mA (typical)
0
0.059
0.118
13.176
14.941
15
LED1 TO LED4 DRIVERS ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
J
= 25
o
C. Limits in
boldface
type apply over the operating ambient temperature range (-30
o
C
<
T
<
+85
o
C). Unless otherwise noted, specifications apply to the LP55271 Block Diagram with: V
IN
= 3.6V, C
IN
= 10 μF, C
= 10 μF, C
OUT2
= 10 μF, C
VDDIO
= 100 nF, C
VREF
= 100 nF, C
VDDA
= 4.7 μF, C
VDD1
= 100 nF, C
VDD2
= 100 nF, L
1
= 4.7 μH. (Note
9)
Symbol
I
MAX
I
LEAKAGE
I
LED
Parameter
Maximum Sink Current
Leakage Current
Current Tolerance
Condition
Min
Typ
Max
Units
mA
μA
mA
15
0.03
13.2
V
FB
= 5.0V
I
SINK
= 13.2 mA (target value)
-7
+7
%
%
I
MATCH
Sink Current Matching
Between LED 1 to 4
Saturation Voltage
I
SINK
= 13.2 mA
1
V
SAT
3.0V
≤
V
IN
≤
5.5V,
Current Decreased to 95% of the
Maximum Sink Current
150
230
mV
Note:
Sink current matching is the maximum difference from the average.
L
www.national.com
12
相關(guān)PDF資料
PDF描述
LP55271TLX Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP55271 Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP5527 Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP5527TL Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP5527TLX Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP55271TL/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP55271TLX 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization
LP55271TLX/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP5527TL 制造商:Texas Instruments 功能描述:DRIVER FLASH LED I2C POWERWISE
LP5527TL/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*