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| 型号： | A8509GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/28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
from powering-up and putting an uncontrolled amount of current
through the LEDs. After the short is removed the affected LEDx
pin will rise up to the 500 mV level. When the LEDx pin voltage
exceeds the 260 mV threshold, the IC detects connected LEDs
and proceeds with LED detection and soft start. Figure 2 shows
a case when two LED channels are enabled. During the LED
detection period, voltage on both LEDx pins > 260 mV. Figure 5
shows a case with LEDa temporarily shorted to ground and
LEDb in normal operation.
When the converter senses that there is enough voltage on the
LEDx pins, the converter proceeds to increase the LED current
to the preset regulation current and the boost switch current sense
voltage limit is switched to the I SW(LIM) level to allow the A8509
to deliver the necessary output power to the LEDs (figure 8).
Soft start function
During soft start the LED current gain is reduced to (I LEDSS ).
As an example, for a 240 mA output current, the soft-start LED
C1
C2
V EN
I IN
I IN limited by boost switch
to V SWSS(LIM) / R SENSE
current would be set to about 9 mA (see figure 7). Also dur-
ing soft start the boost switch sense voltage is reduced to the
V SWSS(LIM) level, to limit the initial inrush current generated by
the charging of the output capacitors. The actual current limit
(I LIM ) is equal to:
C3
I OUT
V OUT
I LIM = V SWSS(LIM) / R SENSE
(1)
C4
t
where V SWSS(LIM) is found in the Electrical Characteristics table,
and R SENSE is the current sense resistor value.
Figure 7. Start-up operation, individual LEDx current = 240 mA, boost
sense resistor = 0.010 Ω ; shows V EN (ch1, 2 V/div.), I IN (ch2, 2 A/div.),
I OUT (ch3, 1 A/div.), and V OUT (ch4, 20 V/div.), t = 500 μ s/div.
C1
V EN
I IN limited by boost switch
to V SWSS(lim) / R SENSE
C1
V EN
Boost starts operating in
normal current limit V SW(LIM)
V COMP
C2
C3
I IN
I OUT
C2
C3
I IN
I IN limited by boost switch
to V SWSS(LIM) / R SENSE
C4
V OUT
t
C4
V OUT
t
V OUT sufficient to begin
normal power-up
Figure 6. Start-up operation, individual LEDx current = 120 mA, boost
sense resistor = 0.020 Ω ; shows V EN (ch1, 2 V/div.), I IN (ch2, 1 A/div.),
I OUT (ch3, 200 mA/div.), and V OUT (ch4, 20 V/div.), t = 500 μ s/div.
Figure 8. Normal start-up behavior; shows VEN (ch1, 2 V/div.), V COMP
(ch2, 2 V/div.), I IN (ch3, 1 V/div.), and V OUT (ch4, 10 V/div.), t = 500 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
9
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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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