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| 型号： | A8509GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE 4X120MA 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 300kHz ~ 800kHz |
| 电源电压： | 9 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
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A8509
Wide Input Voltage Range, High Efficiency
4-Channel Fault Tolerant LED Driver
Functional Description
Enabling the IC
The IC turns on when a logic high signal is applied on the EN
pin, and the input voltage present on the VIN pin is greater than
the 8.5 V necessary to clear the UVLO (V UVLOrise ) threshold.
Before the LEDs are enabled, the A8509 driver goes through a
C1
V OUT
system check to determine if there are any possible fault condi-
tions that might prevent the system from functioning correctly.
Powering up: LED pin short-to-GND check
C2
C3
V EN
V LEDa (not used)
After the VIN pin goes above the UVLO threshold, and a high sig-
nal is present on the EN pin, the IC proceeds to check if any LEDx
pins are shorted to GND and/or are not used. Each unused pin
should be connected to GND with a 2.4 k Ω pull-down resistor.
After the voltage threshold on the LEDx pins exceeds 120 mV, a
timer of 1536 clock cycles (2 ms at 800 kHz switching frequency,
see figure 2) is applied during which the A8509 determines the
V LEDb (used)
C4
t
Figure 3. LED detect circuit operation for an LED pin that is not being
used; shows V OUT (ch1, 10 V/div.), V EN (ch2, 5 V/div.), an unused LEDx
with a 2.4 k Ω resistor from this pin to GND, V LEDa (ch3, 500 mV/div.), and
a used LEDx, V LEDb (ch4, 500 mV/div.), t = 2 ms/div.
status of the pins. Any unused pin connected to GND with the
pull-down resistor will be taken out of regulation at this point and
will not contribute to the boost regulation loop (see figure 3). A
typical example is shown in figure 4. When a pin is connected
to GND through a 2.4 k Ω resistor, the voltage on that LEDx pin
A8509
LED1
LED2
LED3
A8509
LED1
LED2
LED3
during the LED detection period is about 200 mV. This is shown
GND
LED4
GND
LED4
in figure 2.
If an LEDx pin is shorted to ground such that LEDx pin voltage
is < 100 mV, the A8509 will not proceed with soft start until the
short is removed from the LEDx pin. This prevents the A8509
V OUT
2.4 k Ω
Figure 4. Channel select setup: (left) channel LED4 not used,
(right) using all channels.
V OUT
C1
C1
V EN
C2
V EN
C2
Short removed
LED detection period
C3
V LEDa
V LEDb
LED detection period
C3
C4
V LEDa (with temporary short)
V LEDb (no short)
C4
t
Figure 2. LED detect circuit operation for two connected LEDs at f SW =
800 kHz; shows V OUT (ch1, 10 V/div.), V EN (ch2, 5 V/div.), an LEDx, V LEDa
(ch3, 500 mV/div.), another LEDx, V LEDb (ch4, 500 mV/div.), t = 2 ms/div.
t
Figure 5. LED detect circuit operation: device powers-up after the short
is removed from the LED pin; shows V OUT (ch1, 10 V/div.), V EN (ch2,
5 V/ div.), an LEDx with short, V LEDa (ch3, 500 mV/div.), and an LEDx
without short, V LEDb (ch4, 500 mV/div.), t = 2 ms/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8510 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency |
| A8510GECTR-T | 功能描述:IC LED DRVR BCKLGHT/WHT 26QFN-EC 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 |
| A8511 | 制造商:ROCKWE 功能描述: |
| A8511KLPTR-T | 功能描述:IC LED DVR 150MA AUTO 28-TSSOP 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 |
| A8512 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LED Backlight Driver for Medium/Large Displays |
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