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参数资料
| 型号： | AL8400SE-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR LED DRIVER SOT353 |
| 标准包装： | 1 |
| 拓扑： | 线性 |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 电源电压： | 2.2 V ~ 18 V |
| 输出电压： | 0.2 V ~ 18 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SOT-353 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | AL8400SE-7DIDKR |
AL8400 /AL8400Q
Application Information (cont.)
Bipolar Example – Choosing R B and C L
The driver is required to control 3 series connected LEDs at 150mA ±10% from a 12V ±5% supply. Each LED has a forward voltage of 3V
minimum and of 3.6V maximum.
From this information the minimum supply voltage is 11.4V and the maximum LED chain voltage is 10.8V. Rearranging equation 1 (page 7); the
minimum voltage drop across the bipolar transistor is determined to be:
V CE = V CC min ? V LED max ? V FB = 11 . 4 V ? 10 . 8 V ? 0 . 2 V = 0 . 4 V
We will use the DNLS320E bipolar transistor (Q2.)
R Bmax
The DNLS320E datasheet table states:
V CE(SAT)max = 0.1V at I C = 100mA, I B = 0.5mA
h FEmin = 500 @ I C = 100mA, V CE = 2V;
The datasheet graph (see left) shows a very slow variation at 100mA, so a value of 500 is considered appropriate.
Then I B max =
150mA
500
= 0.3mA
The minimum recommended I OUT for AL8400 is 0.3mA and the maximum V BE , according to the DNLS320E datasheet graph (Figure 6), is
approximately 0.8V at -55°C.
From these and equation 3, the maximum allowed bias resistor value is:
R B max =
V CC min ? V BE max ? V FB
I OUT min + I B max
=
=
11 . 4 ? 0 . 8 ? 0 . 2
0 . 0003 + 0 . 0003
= 17.3k ?
Figure 5 DNLS320E H FE vs. I C
Figure 6 DNLS320E V BE vs. I C
AL8400/ AL8400Q
Document number: DS35115 Rev. 4 - 2
7 of 13
www.diodes.com
August 2012
? Diodes Incorporated
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