- 您现在的位置：买卖IC网 > Datasheet目录310 > AL8400SE-7 (Diodes Inc)IC CTRLR LED DRIVER SOT353 Datasheet资料下载
参数资料
| 型号： | AL8400SE-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 8/13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 (cont.)
R Bmin
To ensure that the output capability of the AL8400 is not exceeded at maximum V IN , maximum h FE and minimum V BE , these values should be
substituted back into the R B equation to determine the minimum allowable value for R B .
h FEmax is about 1200 @ I C = 100mA, and a temperature of +85°C (Figure 5) which results in:
I B min =
150
1200
= 0.125mA
The maximum recommended I OUT for AL8400 is 15mA.The minimum V BE , according to the DNLS320E datasheet graph (Figure 6), is
approximately 0.4V at 85°C and assuming V CCmax = 12.6V, then from equation 4 the bias resistor value is:
R B min =
V CC max ? V BE min ? V FB
I OUT max + I B min
=
=
8 . 4 ? 0 . 4 ? 0 . 2
0 . 015 + 0 . 000125
= 516 ? this is less than 17k ? and so the AL8400 output current is within its ratings.
C L
Choosing R B = 11k ? satisfies the requirements for the AL8400 conformance and sets approximately 1mA in the OUT pin. The required
compensation capacitor can therefore be calculated from:
C L ≈
2ms
11 k Ω
≈ 0 . 18 μ F
180nF
The value of R SET is V REF /I LED so:
R SET
= 0.2/0.15 = 1.333 ?
Choosing two 2.7 ? yields 1.35 ? giving an approximate 1.3% difference from target.
Finally, the maximum power dissipation of the external bipolar transistor is:
P TOT
= I LED x V CEMAX
= I LED x (V CC_max – V LED_MIN – V FB ) = 0.51W
This determines the package choice ( θ JA ) in order to keep the junction temperature of the bipolar transistor below the maximum value allowed. At
a maximum ambient temperature of +60°C the junction temperature becomes
T J
= T A + P TOT x θ JA
= 60 + 0.51 x 125 = +123.75°C
N-Channel MOSFET as the Pass Element
Alternatively, an N-channel MOSFET may be used in the same configuration. The current in R B is then reduced compared to the case in which
the bipolar transistor is used. For LED currents up to about 400mA a suitable MOSFET is DMN6068SE in the SOT223 package. The design
procedure is as follows, referring to Figure 7.
Figure 7 Application Circuit Using MOSFET
AL8400/ AL8400Q
Document number: DS35115 Rev. 4 - 2
8 of 13
www.diodes.com
August 2012
? Diodes Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| AL8805W5-7 | IC REG SW CONV BUCK ASYNC SOT-23 |
| AL8806MP8-13 | IC LED DVR CONS CURR 8MSOP |
| AL8807W5-7 | IC LED DRVR DCDC BUCK SOT25 |
| AL9910AS-13 | IC LED DRVR HIGH BRIGHT SO8EP |
| ALC60481R05 | PWR SUP AC-DC 6-48V 1.05A 50.4W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AL841B | 制造商:ELC 功能描述:PSU BENCH MULTI OUTPUT 制造商:ELC 功能描述:PSU, BENCH, MULTI OUTPUT, EURO |
| AL8504 | 制造商:Molex 功能描述: |
| AL-85-120VAC | 制造商:Carlo Gavazzi 功能描述:LATCH UNIT 50-85A |
| AL875 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Triple High Speed, 8-bit Analog-to-Digital Converter |
| AL8805 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:HIGH EFFICIENCY 30V 1A BUCK LED DRIVER |
发布紧急采购，3分钟左右您将得到回复。