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| 型号： | A8511KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 150MA AUTO 28-TSSOP |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB，白色 LED |
| 频率： | 600kHz ~ 2.1MHz |
| 电源电压： | 8 V ~ 21 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1367-6 |
A8511
2 MHz, 4 Channel×150 mA WLED/RGB Driver
With Output Disconnect
Functional Description
Description
The A8511 is a multioutput WLED/RGB driver for display back-
lighting. It uses a current mode boost converter which operates
at a constant frequency. The boost switching frequency can be
set from 600 kHz to 2.2 MHz by an external resistor connected
across FSET and AGND. The integrated boost DMOS switch is
rated for 40 V at 3.6 A. This switch is protected against overvolt-
age, and provides pulse-by-pulse current limiting independently
of boost converter duty cycle.
The A8511 has 4 well-matched current sinks, which provide
regulated current through the load LEDs for uniform display
brightness. All LEDx sinks are rated for 21 V to allow PWM
dimming control.
Frequency Selection The switching frequency on the SW
pin, f SW , can be set by applying the following equation:
the corresponding LEDx pins exceeds V LEDSC . Refer to the LED
Short Detect section for further details. Unused LEDx pins can be
left open or connected to ground.
Use matched forward voltage LEDs for better efficiency.
The application circuit shown in figure 1 is a boost converter
and the output voltage is always higher than the battery volt-
age. Therefore, the quantity of LEDs per string should be such
that the required output voltage is higher than the maximum
battery voltage. If the battery voltage is higher than the output
voltage, the A8511 will switch with minimum pulse width, and
the actual output voltage will be higher than the required volt-
age. The excess voltage will be dropped across the LED strings.
This lowers efficiency and increases power dissipation, resulting
in higher device temperature. If battery voltage must be higher
f SW = 51 / R FSET ,
where f SW is in MHz, and R FSET is in k Ω .
(1)
than required output voltage, use a SEPIC converter, as shown in
figure 9.
LED Selection Which LED strings are enabled is determined
by the combined settings of the SEL1 and SEL2 pins, according
to the following table:
LED Channel Selection
Soft-Start and Compensation
At startup, the output capacitor is discharged and the A8511
enters soft start. The boost current is limited to 0.6 A and all
active LEDx pins sink 1 / 20 of the set current until all the enabled
SEL1 Pin
Low
High
Low
High
SEL2 Pin
Low
Low
High
High
Enabled LEDx Outputs
Only LED1
LED1 and LED2
LED1, LED2, and LED3
All channels
LEDx pins reach 0.75 V. When the A8511 comes out of soft
start, the boost current and the LEDx pin currents are set to
normal. The output capacitor charges to voltage required to sup-
ply full LEDx currents within a few cycles. Once V OUT reaches
the required level, LEDx current toggles between 0 and 100%
LED strings that are connected to the A8511, but are not enabled
through the SELx pins, may cause a shutdown if the voltage on
in response to PWM signals. Soft start behavior on evaluation
boards is shown in the Performance Characteristics section.
8511-DS
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| A8512ELPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 24TSSOP 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 |
| A8513 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver |
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