Datasheet > LDS8724

LDS8724

更新时间： 2024-02-11 07:03:03

品牌	Logo	应用领域
IXYS		驱动器转换器升压转换器
页数	文件大小	规格书
10页	470K
描述
40 WLED Driver with Boost Converter

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中文翻译

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LDS8724 数据手册

LDS8724

40 WLED 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

synchronous rectifier*)



250 mV current sense voltage

Drives up to 5 LEDs per string with up to 42

LED in 6 strings at 25 mA

resistance. Under-voltage protection disables the part

when V_INvoltage reaches 2.0 V



1 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

The LDS8724 has thermal shutdown set at 150 C.

Above this value, the boost converter stops

switching. The part resumes normal operations when

temperature drops below 130 ⁰C.



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.

APPLICATION

The PWM control ensures brightness adjustment with

a frequency from 100 Hz up to 30 KHz.



Color Display Backlight

Portable Navigation and GPS Receivers

Smart phones

Digital Photo Frames

Portable DVD Players, Notebooks

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.

DESCRIPTION

Table 1 Matrix configuration for LDS8724

The LDS8724 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 1 MHz allows use of small

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

ceramic capacitor.

String

Current

max, mA,

Number of

strings

Number of

LED per string

V_{IN MIN}, V

1 - 6

7, 8

2.7

3.0

2.7

3.0

The use of integrated synchronous rectifier makes

the efficiency dependent on only inductor DC

TYPICAL APPLICATION CIRCUIT

*) Patent pending

Characteristics subject to change without notice

Doc. No. 8724DS, Rev. N1.0

12 3 4 5 6 7...10

中文翻译

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与LDS8724相关器件

型号	品牌	获取价格	描述	数据表
LDS8724008-T2-200	IXYS	获取价格	LED Driver, 45-Segment, PDSO8, 2 X 3 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, HALOGEN FREE AND R
LDS8724008T2-200	IXYS	获取价格	40 WLED Driver with Boost Converter
LDS8726008-T2-200	IXYS	获取价格	LED Driver, 49-Segment, PDSO8, 2 X 3 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, HALOGEN FREE AND R
LDS8845002-T2	IXYS	获取价格	LED Driver, 4-Segment, 3 X 3 MM, 0.50 MM PITCH, HALOGEN FREE AND ROHS COMPLIANT, MO-220, T
LDS8845003-T2	IXYS	获取价格	LED Driver, 4-Segment, 4 X 4 MM, 0.65 MM PITCH, HALOGEN FREE AND ROHS COMPLIANT, MO-220, T
LDS8846002-T2	IXYS	获取价格	LED Driver, 4-Segment, 3 X 3 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, HALOGEN FREE AND ROHS COMP
LDS8846003-T2	IXYS	获取价格	LED Driver, 4-Segment, 4 X 4 MM, 0.80 MM HEIGHT, 0.65 MM PITCH, HALOGEN FREE AND ROHS COMP
LDS8865002-105	IXYS	获取价格	LED Driver, 6-Segment, 3 X 3 MM, 0.5 MM PITCH, ROHS COMPLIANT, TQFN-16
LDS8865002-T2105	IXYS	获取价格	LED Driver, 6-Segment, 3 X 3 MM, 0.5 MM PITCH, ROHS COMPLIANT, TQFN-16
LDS8865002-T2300	IXYS	获取价格	LED Driver, 6-Segment, 3 X 3 MM, 0.5 MM PITCH, ROHS COMPLIANT, TQFN-16

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