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| 型号： | DLD101-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HP CONST CURR 8DFN |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性，PWM |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 电源电压： | 50V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN3030D（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -55°C ~ 150°C |
| 产品目录页面： | 1139 (CN2011-ZH PDF) |
| 其它名称： | DLD101-7DKR |
DLD101
Typical Application Circuit
V CC Supply
R C
LED String
The DLD101 has been designed primarily for solid state lighting
applications, to be used as a current sink circuit solution for LEDs. It
features a N-channel MOSFET capable of 1A drive current and a pre-
biased NPN transistor (which allows direct connection to the base, or
via a series base resistor).
4
3
2
G
1
D
Figure 12 shows a typical application circuit diagram for driving an
LED or string of LEDs. Note that the pre-biased transistor (Q2) has
C
the option of bypassing the series base resistor by connecting directly
Q2
R2
B
Q1
V DS
to pin 7. The N-MOSFET (Q1) is configured as a V BE referenced
current sink and is biased on by R C . The current passed through the
LED string, MOSFET and source resistor, develops a voltage across
R S that provides a bias to the NPN transistor. Consideration of the
I LED ≈
E
5
6
R1
7
8
S
Option 3
Option 3:
V BE
R S
expected linear mode power dissipation must be factored into the
design, with respect to the DLD101's thermal resistance.
V DS = V CC – V F LED String – V RS
Options 1 & 2:
P Q1 = V DS * I LED String
I LED ≈
R S
Option 2
Option 1
1.1 V BE
R S
Option 2:
Capacitor is across R2 for
better noise performance.
PWM dimming functionality can be effected by either driving the NPN
base via an additional resistor (thereby overriding the feedback from
R S ) or by pulling the gate of the MOSFET down by direct connection.
The PWM control pulse stream can be provided by a micro-controller
or simple 555 based circuitry.
Fig. 12 Typical Application Circuit for
Linear Mode Current Sink LED Driver
Ordering Information (Note 7)
Part Number
DLD101-7
Case
DFN3030D-8
Packaging
3000/Tape & Reel
Notes:
7. For packaging details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf.
Marking Information
DFN3030D-8
L101 = Product marking code
YYWW = Date code marking
YY = Last digit of year (ex: 10 for 2010)
L101
WW = Week code (01 to 53)
DLD101
Document number: DS32007 Rev. 8 - 2
7 of 9
www.diodes.com
April 2010
? Diodes Incorporated
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