LDS8720【PDF 1/10 页】IC LED DRIVER PWM 25MA 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

LDS8720

184 WLED Matrix Driver with Boost Converter

FEATURES

? High efficiency boost converter with the input

voltage range from 2.7 to 5.5 V

? No external Schottky Required (Internal

The LDS8720 has thermal shutdown set at 150 C.

synchronous rectifier)

? 250 mV current sense voltage

? Drives up to 10 LEDs per string

? More than 180 LEDs in matrix

? 0.7 MHz Switching Frequency

? Efficiency greater than 83%

? PWM LED Dimming Control Mode

? Over-voltage, under-voltage, over-current,

and over-temperature protection

? Low Shutdown Current (<1μA)

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

package

APPLICATION

The use of integrated synchronous rectifier makes

the efficiency dependent on only inductor DC

resistance. Under-voltage protection disables the part

when V IN voltage reaches 2.0 V.

PV IN voltage may be set equal V IN voltage or higher

up to 15 V to increase power capability of the driver.

Maximum number of LEDs in matrix depends on this

voltage as shown in the table below.

Above this value , the boost converter stops

temperature drops below 130 C.

Color Display Backlight

Portable Navigation and GPS Receivers

Smart phones

Digital Photo Frames

Portable DVD Players

Architectural Lighting

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.

DESCRIPTION

The LDS8720 is a fixed frequency current mode

boost converter with internal synchronous rectifier

and cycle-by-cycle switch current limit specifically

designed to drive matrix of LEDs in respect with the

Table 1. Operation at 0.7 MHz allows use of small

value low profile inductor (10 – 33 μH) and 1 μF 50 V

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 8-pin TDFN 2 x 3 mm

package with a max height of 0.8 mm.

Table 1 Matrix configuration for LDS8720

ceramic capacitor.

TYPICAL APPLICATION CIRCUIT

PV IN MIN, V

2.7

3.0

4.0

5.0

7.5

12.5

Number of

LED per string

String

Current

max, mA,

Number

of strings

1 –3

1 –4

1 –5

1 –6

1 –9

1 – 12

1 – 15

1 – 18

1 – 23

? 2011 IXYS Corp.

Characteristics subject to change without notice

Doc. No. 8720DS, Rev. N1.1

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