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参数资料
| 型号： | AS3691A EB |
| 厂商： | ams |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AS3691A |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 400mA |
| 输出及类型： | 4，非隔离 |
| 输出电压： | 最高 15V |
| 输入电压： | 10 ~ 12 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | AS3691A |
AS3691
Datasheet
A typical AS3691 for single color leds can be done as follows using automatic supply regulation (feedback path
UV):
Figure 15 – Typical AS3691 system for single color leds and supply regulation loop; serveral AS3691 can be cascaded
VDD
Csup
Main
supply
DCDC Converter
for VDD
100nF
...
...
Voltage Feedback
input for DCDC
UV
...
D1
Vc
Vc
Vc
Vc
D1
...
PWM
5V powered
system
(optional)
Overtemp
AS3691
Overtemp
AS3691
VSS
PWM
(optional)
Note: Csup (100nF) is only required, if there are long wires (>0.3m) between the DCDC converter and the
AS3691. The wire length between the Csup capacitor and the CURRx pin on AS3691 should not exceed 0.3m.
If this cannot be guaranteed, add additional capacitors of 100nF to the pins CURRx.
9.1 Design Example
Assume a single color leds application (4 times 3 leds in series, each 100mA with Uf ranging from Uf min =3.2V to
Uf max = 3.8V) with a fixed supply. First choose the external current set resistor with the following formula:
Ri 1 ? 4 =
250 mV
ICURR 1 ? 4
So for a current of 100mA, use a resistor of 2.5 Ω ; 1/8W rated resistors are suitable (even up to 400mA).
Then calculate the required voltage of the power supply. The minimum voltage on the current sink for
guaranteed operation is 0.41V (V CURR @100mA) and the maximum forward voltage of the LEDs is assumed to
be Uf max = 3.8V. Therefore 3*3.8V + 0.41V = 11.81V.
As this is the required minimum voltage of the power supply, add all the tolerances on top. Assumed +/-10%
supply tolerance results in a power supply with nominal 13V (to have at least 11.81V in worst case).
Using the following formula to calculate the external shunt resistor
Rvdd =
VDD MIN ? VREGINT MAX
IVREG MAX
=
VDD MIN ? 5 . 4 V
2 . 5 mA
VDD MIN is the minimum voltage of the
power supply, where Rvdd is connected
obtains 2564 Ω . The nearest lower(!) available value is 2.4k Ω . For Cvdd use
Cvdd = 100 nF
Csup (100nF) is only required, if there are long connections between the DCDC converter and the AS3691
(>0.3m). The wire length between the Csup capacitor and the CURRx pin on AS3691 should not exceed 0.3m. If
this cannot be guaranteed, add additional capacitors of 100nF to the pins CURRx.
www.austriamicrosystems.com (ptr)
Revision 2.3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS3691A-ZQFP | 功能描述:IC LED DVR 400MA RGB/WH 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 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:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| AS3691AZQFT | 制造商:ams 功能描述:QFN24 (4x4x0.5) |
| AS3691A-ZQFT | 功能描述:IC LED DRIVER 4X400MA 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 特色产品:LM3445 TRIAC Dimmable LED Driver 标准包装:55 系列:PowerWise® 恒定电流:是 恒定电压:- 拓扑:PWM，降压（降压） 输出数:1 内部驱动器:无 类型 - 主要:- 类型 - 次要:高亮度 LED（HBLED） 频率:30kHz ~ 1MHz 电源电压:8 V ~ 12 V 输出电压:- 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:管件 工作温度:-40°C ~ 125°C 产品目录页面:1285 (CN2011-ZH PDF) 其它名称:LM3445M |
| AS3691A-ZSDF | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:4 Precision 400mA Current Sources for RGB and Single Color Leds |
| AS3691A-ZTSP | 功能描述:IC LED DVR 400MA RGB/WH 20ETSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 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:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
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