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参数资料
| 型号： | A6280EA-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/14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
PWM Brightness Control
3-Channel Constant-Current LED Driver
with Programmable PWM Control
mented on every rising edge of the CI pin divided by the clock
The A6280 controls the intensity of each LED by pulse width
modulating the current of each output. The A6280 has three
10-bit brightness registers, one for each output. These brightness
registers set the PWM count value at which the outputs switch
off during each PWM cycle. Each 10-bit brightness register
gives 1023 levels of light intensity. The duty cycle, DC (%), can
be determined by the following equation:
DC = [(PWM n + 1) / 1024] ×100 (%),
where PWM n is the PWM value greater than zero that is stored
in the brightness register.
The relationship of the PWM n value to the output duty cycle is
given in the following table:
divider count value when the OEI pin is low. For example, if
the clock divider is programmed to divide the CI by 2, then the
PWM counter will increment once every 2 CI cycles. Given a 5
MHz CI frequency, the clock period would be 200 ns.
The clock divider data in the shift register is latched on a rising
edge of the LI (Latch In) pin. The latched clock divider data
remains latched on a rising OEI signal.
The total number of possible colors of an RGB pixel is over
1 billion. Refer to figure 6 for the mapping of shift register bits
to latches.
Output Current Selection
The overall maximum current is set by the external resistor,
PWM n
0
1
2
...
1023
Duty Cycle
0/1024 (0 %)
2/1024
3/1024
...
1024/1024 (100 %)
R EXT , connected between the REXT and LGND pins. Once set,
the maximum current remains constant regardless of the LED
voltage variation, supply voltage variation, temperature, or other
circuit parameters that could otherwise affect LED current. The
maximum output current can be calculated using the following
equation:
When the brightness register is set to zero, the outputs remain off
for the duration of the PWM cycle for a 0% DC. When a bright-
ness register is set to 1023, the LED for that output remains on
(100% DC) when OEI is active and begins the PWM cycle. The
output remains on when the PWM counter rolls over and begins
a new count.
The PWM counter begins counting at zero and increments only
when the OEI pin is held low. When the PWM counter reaches
the count of 1024, the counter resets to zero and continues incre-
menting. The counter resets to zero on a rising edge of CI when
OEI is high, upon recovery from UVLO, and when powering-up.
Latching new data into the brightness registers will not reset the
PWM counter.
Table 1. Clock Divider Configurations
I OUT (max) = 753.12 / R EXT .
The relationship of the value selected for R EXT and I OUT is
shown in figure 5.
Internal Linear Regulator
The A6280 has a built-in linear regulator. The regulator operates
from a supply voltage of 5.5 to 17 V. It allows the VIN pin of the
A6280 to connect to the same supply as the LEDs. This simpli-
fies board design by eliminating the need for a chip supply bus
150
140
130
120
110
100
90
80
70
7
0
1
0
1
Bits
8
0
0
1
1
Divide By Count
÷ 1 (no division)
÷ 2
÷ 4
÷ 8
60
50
40
30
20
10
0
5
15
25
35 45
55
65
75
There is a programmable clock divider that can slow the PWM
counter relative to the CI pin. See table 1 for bit assignments of
the programmable clock divider. The PWM counter is incre-
R EXT (k Ω )
Figure 5. Output Current versus External Resistor, R EXT
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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相关代理商/技术参数 |
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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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