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参数资料
| 型号： | A8510GECTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 21/33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
Setting the current sense resistor
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
VDD
The typical threshold for the current sense circuit is 180 mV,
when R ADJ is 0 Ω . This voltage can be trimmed by the R ADJ
resistor. The typical trip point should be set at about 3 A, which
coincides with the cycle-by-cycle current limit minimum thresh-
old. A sample calculation is done below:
Given: 2.85 A of input current, and the calculated maximum
value of the sense resistor, R SC = 0.063 Ω .
The R SC chosen is 0.056 Ω , a standard value.
Also:
The VDD pin provides regulated bias supply for internal circuits.
Connect the capacitor C VDD with a value of 0.1 μ F or greater to
this pin.
Shutdown
If the EN/PWM pin is pulled low for more than t PWML , the
device enters shutdown mode and clears all internal fault regis-
ters. As an example, at a 2-MHz clock frequency, the maximum
PWM low period, while avoiding shutdown, is 16 ms. In shut
down, the IC disables all current sources and waits until the
EN/PWM pin goes high to re-enable the IC and proceed with
power-up.
Fault protection during operation
R ADJ = ( V SENSETRIP – V ADJ ) / I ADJ
The typical trip point voltage is calculated as:
V ADJ = 2.85 A × 0.056 Ω = 0.160 V
R ADJ = (0.180 – 0.160 V) / (20.3 μ A) = 1.0 k Ω
(5)
The A8510 constantly monitors the state of the system to deter-
mine if any fault conditions occur during normal operation. The
response to a triggered fault condition is summarized in the Fault
Mode table, on the next page.
The possible fault conditions that the device can detect are: Open
LED pin, LED pin shorted to GND, shorted inductor, V OUT short
to GND, SW pin shorted to GND, ISET pin shorted to GND, and
input disconnect switch source shorted to GND.
Input UVLO
When V IN and V SENSE rise above the UVLO enable hysteresis
(V UVLOrise + V UVLOhys ), the A8510 is enabled. A8510 is disabled
when V IN falls below the V UVLOfall threshold for more than 50 μ s.
This lag is to avoid shutting down because of momentary glitches
in the input power supply.
Note the following:
? Some of the protection features might not be active during
startup, to prevent false triggering of fault conditions.
? Some of these faults will not be protected if the input
disconnect switch is not being used. An example of this is
VOUT short to ground.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
21
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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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