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| 型号： | A6280EA-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PWM CONTROL 16-DIP |
| 标准包装： | 10,000 |
| 恒定电流： | 是 |
| 拓扑： | 线性，PWM |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 次要： | RGB |
| 频率： | 5MHz |
| 电源电压： | 4.75 V ~ 17 V |
| 输出电压： | 1 V ~ 3 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-DIP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1256 |
A6280
3-Channel Constant-Current LED Driver
with Programmable PWM Control
Application Information
Timing Considerations
A6280s can be used in large numbers to drive many LEDs with
the control signals connected serially together, with short cables
between each pixel (see figure 8). Because the clock negative
edge drives the data to the SDO (Serial Data Out) pin, and the
CO pin is driven by a 100 ns one-shot function, the clock and
data signals remain synchronized with each other as you move
from the first pixel in the chain to the last.
After all of the data is written to each A6280 in the chain, the
data is latched into each A6280 via a low-to-high transition on
the LI pin. The LO pin of pixel #1 drives the LI pin of pixel #2,
and so on down the chain. These signals are buffered and are
driven asynchronously relative to the CI and SDI pins. Therefore
the mismatch in delays between CO and LO must be taken into
consideration.
CI(1)
Although the mismatches in delays are quite small, they must be
considered when creating the timing pattern for driving the chain.
The key parameter is the setup time from the last CI clock rising
edge to the rising edge of LI.
The minimum A6280 setup time from CI to LI is 20 ns. There
may be a 5 ns per pixel mismatch in the propagation delays of the
CI and LI signals (the delay from CI to CO compared to the delay
from LI to LO). As a rule of thumb, use a setup time, t su , at the
first A6280 in the chain as calculated below:
t su = 20 ns + n × 5 ns ,
where n is the number of pixels in the chain.
This will ensure that the setup time at the last pixel in the chain is
at least 20 ns.
t su
CI(1) to CI( n )
LI(1) to LI( n )
CO(1) = CI(2)
CO(2) = CI(3)
CO( n -1) = CI( n )
LI (1)
LO(1) = LI (2)
LO(2) = LI (3)
LO( n -1) = LI ( n )
Figure 7. Signal Delay Mismatch Timing Diagram. t su is the setup time for signals (CI to
LI) applied to the first pixel in the chain. Note the difference in delay for CI(1) to CI(n)
compared to the delay for LI(1) to LI(n). This must be compensated by increasing t su .
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
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| A6280EESTR-T | 功能描述:IC LED DRIVER PWM CONTROL 16-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 |
| A6281 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:3-Channel Constant Current LED Driver with Programmable PWM Control |
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| A628-12 | 功能描述:ADAPTER PROGRAMMER 56-TSOP RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、缆线、软件、数据表和用户手册 其它名称:520-1035 |
| A62812-000 | 制造商:TE Connectivity 功能描述:55 CABLE - Cable Rools/Shrink Tubing 制造商:TE Connectivity 功能描述:55A7389-22-9-9CS2275A |
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