LDS8711【PDF 1/12 页】IC LED DRIVER PWM 32MA 8TDFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录336

[1页]2页 3页 4页 5页

LDS8711

High Efficiency 10 LED Driver with No External Schottky

The LDS8711 has thermal shutdown set at 150 C.

temperature drops below 130 C.

FEATURES

? High efficiency boost converter with the input

voltage range from 2.7 to 5.5 V

? 250 mV current sense voltage

? Drives one LED string with 10 LEDs in series

up to 32 mA

? No external Schottky Required (Internal

synchronous rectifier*)

? 0.7 MHz Switching Frequency

? Efficiency greater than 83%

? Smart OneWire ? Interface and PWM LED

Brightness Control Modes Provide Constant

I LED current or constant color temperature

brightness control

? Small External Inductor (10 μH – 33 μH)

? Over voltage, under voltage, over

temperature, over current protection

? Low Shutdown Current (<1μA)

? Available in 2 x 3 x 0.8 mm 8-pin TDFN

package

APPLICATION

? Color Display Backlight

? Portable Navigation and GPS Receivers

? Smart phones

? Digital Photo Frames

? Portable DVD Players

? Multimedia Phones

DESCRIPTION

The LDS8711 is a fixed frequency current mode

boost converter with internal rectifier and cycle-by-

cycle switch current limit specifically designed to

drive a string of up to 10 White LEDs. It operates

TYPICAL APPLICATION CIRCUIT

*) Patent pending

either in PWM or in Smart OneWire ? Interface

mode. The Smart OneWire ? Interface mode allows

set LED current in the range from 0.125 to 32 mA in

256 steps of 0.125 mA each. In PWM mode,

LDS8711 operates with either factory, or customer

preset maximum LED current values. Series

connection of the LEDs provides constant current

and subsequently uniform brightness, eliminating the

need for ballast resistors and factory calibration.

Operation at 0.7 MHz allows use of small value

inductor (10 – 33 μH) and external ceramic capacitor

(1 – 2.2 μF).

The use of integrated rectifier makes the efficiency

dependent on only two external components

parameters: inductor DCR and external capacitor

ESR.

The supply voltage down to 2.7 V for new Li-ion

battery chemistries or two alkaline battery cells

extends the battery life. Under-voltage protection

disables the part when V IN voltage reaches 2.0 V

Above this value , the boost converter stops

switching. The part resumes normal operations when

The over-current protection provides cycle-by-cycle

current limit.

The internal output over-voltage protection prevents

damage in the case of a faulty LED disconnect.

The PWM control ensures brightness adjustment with

a frequency from 100 Hz up to 30 KHz.

The EN/PWM logic input functions as a chip enable

and LED current PWM contol pin.

The device is available in in 8-pin TDFN 2 x 3 mm

package with a max height of 0.8 mm.

? 2010 IXYS Corp.

Characteristics subject to change without notice

Doc. No. 8711DS, Rev. N1.0

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)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

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

我的联系方式