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参数资料
| 型号： | A8512ELPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BKLGT 24TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | 高端，低端，PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 300kHz ~ 1MHz |
| 电源电压： | 8 V ~ 24 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8512
LED Backlight Driver for LCD Monitors and Televisions
During normal operation, the IC draws approximately
10 to 15 mA from the VIN pin, depending on switching fre-
quency and the external MOSFET. At V IN = 12 V, this translates
into 120 to 180 mW of power consumption, most of it dissipated
in internal linear regulators. This power increases proportionally
with input voltage. Therefore it is highly recommended to keep
V IN between 10 and 24 V during normal operation.
If the input battery voltage must be higher than 24 V, a better
solution is to power the VIN pin separately using a 12 V supply.
Doing this reduces the heat dissipation of the IC, and improves
the overall system efficiency.
Fault Mode in Single-Controller Operation
Parallel Operation The A8512 is designed to operate with up
to six A8512 devices connected in parallel, in order to drive a
greater number of LED strings. In this case, the A8512 which
controls the boost converter is designated the master, while the
other devices are slaves which serve as current sinks for their
own LED strings. Slaves communicate with the master through
the shared COMP signal. PWM dimming and protection mecha-
nisms work consistently across all devices.
Select R OVP1 for the master controller such that its OVP set-
point is approximately 10 V above the LED operating voltage
at cold. Select R OVP2 for each slave controller at approximately
15 to 25 k Ω lower than that for the master. This ensures that, in
the case in which an open-LED fault occurs, the slave controllers
Fault State
Over-
voltage
Protection
Auto-
Restart
Yes
Description
Fault occurs when output voltage exceeds
the OVP setpoint voltage. Used to prevent
the output voltage from damaging the power
components.
will enable OVP before the master does.
Fault occurs when the current through the
Pulse-
external MOSFET increases such that the
by-Pulse
Current Limit
Overcurrent
Protection
Over-
temperature
Protection
LED Short
Protection
VIN UVLO
Yes
Yes
Yes
No
No
voltage across the SENSE1 and SENSE2 pins
exceeds 95 mV typical. The MOSFET switch is
turned off on a cycle-per-cycle basis.
Multiple pulse-by-pulse current limits will cause
the COMP pin voltage to rise. After a time
period determined by the COMP pin current
and the COMP capacitor, the COMP voltage will
exceed the overcurrent detect threshold, forcing
a fault. System may hiccup if the total current
requirement is too high.
Fault occurs when the die temperature exceeds
the over-temperature threshold, 165°C typical.
Fault occurs when the LED pin voltage exceeds
V SC , 25 V typical.
Fault occurs when VIN drops below V UVLO ,
6.5 V typical. This fault resets all latched faults.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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| A8513KLPTR-T | 功能描述:IC LED DRVR AUTO BCKLGHT 16TSSOP 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 |
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