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参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 16/33页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BCKLGHT/WHT 26QFN-EC |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 2.25MHz |
| 电源电压： | 5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-WFQFN 裸露焊盘 |
| 供应商设备封装： | 26-QFN/MLP-EP（4x4） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 105°C |
| 其它名称： | 620-1385-6 |
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A8510
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
appropriate value. In cases where the user-supplied APWM has
is controlled by the following formula:
significant duty cycle limitations, it might be preferable to set the
maximum ISET current to be 25% to 50% higher, thus allowing
I SET =
V ISET – V DAC
R ISET – V DAC
(3)
V ISET V DAC – V ISET
theAPWM signal to have duty cycles that are between 50% and
75%.
Although the APWM dimming function has a wide frequency
range, if this function is used strictly as an analog dimming
function it is recommended to use frequency ranges between
50 and 500 kHz for best accuracy. The frequency range must be
considered only if the user is not using this function as a closed
loop trim function. There is a few millisecond propagation delay
between the APWM signal and I LED current. This effect is shown
in figures 16 through 18.
Analog dimming
The A8510 can also be dimmed by using an external DAC or
another voltage source applied either directly to the ground side
of the R ISET resistor or through an external resistor to the ISET
pin (see figure 19).
? For a single resistor (upper panel of figure 19), the ISET current
Where V ISET is the ISET pin voltage and V DAC is the DAC out-
put voltage.
When the DAC voltage is equal to V ISET , the internal reference,
there is no current through R ISET . When the DAC voltage starts
to decrease, the ISET current starts to increase, thus increasing
the LED current. When the DAC voltage is 0 V, the LED current
will be at its maximum.
? For a dual-resistor configuration (lower panel of figure 19), the
ISET current is controlled by the following formula:
I SET = – (4)
R ISET R 1
The advantage of this circuit is that the DAC voltage can be
higher or lower, thus adjusting the LED current to a higher or
lower value of the preset LED current set by the R ISET resistor:
? VDAC = 1.003 V; the output is strictly controlled by R ISET
? VDAC > 1.003 V; the LED current is reduced
? VDAC < 1.003 V; the LED current is increased
DAC
R ISET
A8510
C1
EN/PWM
APWM
VDAC
GND
ISET
GND
C2
I OUT
DAC
R1
A8510
VDAC
ISET
C3
t
GND
R ISET
GND
Figure 18. Transition of output current level when a 50% duty cycle signal
is applied to the APWM pin, in conjunction with a 50% duty cycle PWM
dimming being applied to the EN/PWM pin; shows EN/PWM (ch1, 5 V/
div.), APWM (ch2, 5 V/div.), and I LED (ch3, 20 mA/div.), t = 1 ms/div.
Figure 19. Simplified diagrams of voltage control of I LED : typical
applications using a DAC to control I LED using a single resistor (upper),
and dual resistors (lower).
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
16
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A8512EETTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 28QFN 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 |
| A8512ELBTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24SOIC 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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