收藏本站
LDS8845
BLOCK DIAGRAM
Figure 2. LDS8845 Functional Block Diagram
BASIC OPERATION
The device starts operating if the EN pin is set logic
HIGH and input voltage is higher that under voltage
protection lockout threshold.
The low dropout PowerLite ? Current regulator
performs well at input voltages up to 50 mV greater
than the LED forward voltage significantly increasing
the driver’s efficiency.
ILED, mA
5
10
15
20
25
30
R SET , k Ω
96
48
32
24
19.2
16
Nearest standard 1% value
95.3
47.5
31.6 or 32.4
23.7 or 24.3
19.1
15.8 or 16.2
Input pins EN, CTRL0, and CTRL1 may be either
logic LOW or HIGH during power-up. However, logic
voltage should never exceed input voltage V IN , and
these pins should not be left float.
LED Current Setting
The desired current value in each of the four LED is
set by external resitor R SET connevted between I SET
pin and ground..
The LED current is 400 times greater than the current
through R SET and can be estimated by following
equation:
The average current value may be decreased using
PWM signal applied to either CTRL0 or CTRL1 pin.
LDS8845 allows modulation frequiencies in the range
from 100 Hz to 10 kHz with duty cycles from 100% to
1%. Modulation frequiencies lower than 100 Hz are
not recommended especialy at short duty cycles
because LED flicker may be visible.
If CTRL1 pin is logic HIGH and PWM signal applies
to CTRL0 pin, then all four LEDS are dimming
synchronously.
If CTRL0 pin is logic HIGH and PWM signal applies
to CTL1 pin, then LEDs from LED1 to LED3 are
I
? 400 x
LED
its resistance.
V SET
R SET
, where V SET =1.2V, and R SET is
dimming, while LED4 is always off.
If PWM signal applies to both CTRL pins teed
together, then LED1 and LED2 are dimming, while
LED3 and LED4 are off.
R SET value for typical I LED current is shown at the
table below.
? 2009 IXYS Corp.
Characteristics subject to change without notice
6
Doc. No. 8845DS, Rev. N1.6
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LDS8846-002-T2 IC LED DVR WHT/CLR BCKLGT 16WQFN
LDS8865002-T2-250 IC LED DVR WHT/CLR BCKLGT 16WQFN
LDS8866002-T2-300 IC LED DVR WHT/CLR BCKLGT 16WQFN
LDS8868-002-T2 IC LED DVR WHT/CLR BCKLGT 16WQFN
LDS8869-002-T2 IC LED DVR WHT/CLR BCKLGT 16WQFN
LDV100-012SN POWER SUPPLY LED 90W 12V COMPACT
LDV100-024SN POWER SUPPLY LED 100W 24V COMPAC
LE25S40MB-AH IC MEM 4MBIT SERIAL FLASH 8SOP
相关代理商/技术参数
LDS8846-002-T2 功能描述:LED照明驱动器 4-Chan UL DropOut WLED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LDS8865-002-T2 功能描述:LED照明驱动器 6-Chan Chge Pump Bsd LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LDS8865002-T2-250 功能描述:IC LED DVR WHT/CLR BCKLGT 16WQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:PowerLite™ 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C
LDS8866002-T2-300 功能描述:IC LED DVR WHT/CLR BCKLGT 16WQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:PowerLite™ 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C
LDS8868-002-T2 功能描述:LED照明驱动器 6-Chan Chge Pump Bsd LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LDS8869-002-T2 功能描述:IC LED DVR WHT/CLR BCKLGT 16WQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:PowerLite™ 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C
LDS9003-002-T2 功能描述:LED照明驱动器 High Power LED Temp & PWM Contr RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LDS-A2802RI 功能描述:LED 显示器和配件 .28" Sng Digit Disp 565nm Green LEDs RoHS:否 制造商:Avago Technologies 显示器类型:7 Segment 数位数量:2 字符大小:7.8 mm x 14.22 mm 照明颜色:Red 波长:628 nm 共用管脚:Common Anode 工作电压:2.05 V 工作电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 35 C 封装:Tube