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参数资料
| 型号： | LDS8726 |
| 厂商： | IXYS |
| 文件页数： | 1/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PWM 25MA 8TDFN |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 24V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | LDS8726DKR |
LDS8726
49 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 7 LEDs per string with up to 49
The LDS8726 has thermal shutdown set at 150 C.
temperature drops below 130 C.
LED in 7 strings at 25 mA
? 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
APPLICATION
resistance. Under-voltage protection disables the part
when V IN voltage reaches 2.0 V
0
Above this value , the boost converter stops
switching. The part resumes normal operations when
0
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.
?
?
?
?
?
Color Display Backlight
Portable Navigation and GPS Receivers
Smart phones
Digital Photo Frames
Portable DVD Players, Notebooks
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
DESCRIPTION
package with a max height of 0.8 mm.
Table 1 Matrix configuration for LDS8726
The LDS8726 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.
The use of integrated synchronous rectifier makes
the efficiency dependent on only inductor DC
Number of
strings
1-5
6
6
7
7
8
Number of
LED per string
7
7
7
7
6
5
String
Current
max, mA,
30
30
25
25
25
25
V IN MIN ,
2.7
3.3
2.7
3.1
2.7
2.7
V
TYPICAL APPLICATION CIRCUIT
*) Patent pending
? 2010 IXYS Corp.
Characteristics subject to change without notice
1
Doc. No. 8726DS, Rev. N1.0
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