- 您现在的位置：买卖IC网 > Datasheet目录307 > A8513KLPTR-T (Allegro Microsystems Inc)IC LED DRVR AUTO BCKLGHT 16TSSOP Datasheet资料下载
参数资料
| 型号： | A8513KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/25页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR AUTO BCKLGHT 16TSSOP |
| 特色产品： | Allegro A8513 LED Driver |
| 标准包装： | 1 |
| 拓扑： | PWM，SEPIC，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.8MHz ~ 2.2MHz |
| 电源电压： | 4.5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 125°C |
| 其它名称： | 620-1440-6 |
A8513
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Functional Description
The A8513 incorporates a current-mode boost controller with
internal DMOS switch, and a single LED current sink. It can be
used to drive an LED string of up to 14 white LEDs in series,
with current up to 150 mA. For optimal efficiency, the output of
the boost stage is adaptively adjusted to the minimum voltage
required to power the LED string. This is expressed by the fol-
IC will not power up until the short is removed. At this time the
output is also checked for a V OUT short, using the OVP pin. If the
OVP pin does not rise above V OVPLO(th) the IC will not power up.
Soft start function
During soft start, the COMP pin delivers a steady 80 uA current,
lowing equation:
where
V OUT = V LED + V REG
(1)
the LED pin current gain is set to A ILEDSS . The lower gain will
help limit the inrush current generated by charging the output
V LED is the voltage drop across the LED string, and
V REG is the regulation voltage of the LED current sink (typically
0.88 V at the maximum LED current).
V OUT
Enabling the IC
The IC turns on when a logic high signal is applied to the
EN/PWM pin (figure 1), and turns off when this pin is pulled to
a logic low. For the device to be enabled, the voltage on the VIN
pin must be greater than V UVLOrise to clear the undervoltage lock-
out (UVLO) threshold (figure 2). Before startup, the A8513 goes
through a system check to determine if there are any fault condi-
tions that would prevent the system from functioning correctly.
Powering up: LED pin short to GND check
C1
C2
C3
C4
I LED
COMP
EN/PWM
UVLO threshold
exceeded
t
After the VIN pin goes above V UVLOrise , the IC checks if the LED
pin is shorted to GND by pre-charging the LED pin (figure 3).
When the voltage on the LED pin exceeds 260 mV, the A8513
Figure 2. Start-up by slowly ramping up V IN with EN/PWM at 2 V; shows
V OUT (ch1, 10 V/div.), I LED (ch2, 50 mA/div.), COMP (ch3, 1 V/div.), and
EN/PWM (ch4, 2 V/div.), time = 2 ms/div.
proceeds with soft start. If a short is present on the LED pin, the
V OUT
FAULT
C1
C2
I LED
C1
C2
C3
V LED
I LED
LED detection
C3
COMP
C4
EN/PWM
EN/PWM
C4
t
t
Figure 1. Start-up by slowly ramping up EN/PWM with V IN at 16 V; shows
V OUT (ch1, 10 V/div.), I LED (ch2, 50 mA/div.), COMP (ch3, 1 V/div.), and
EN/PWM (ch4, 2 V/div.), time = 2 ms/div.
Figure 3. LED detection period; shows ˉFˉ ˉA ˉ ˉUˉˉLˉ ˉTˉ (ch1, 5 V/div.), V LED (ch2,
1 V/div.), I LED (ch3, 100 mA/div.), and EN/PWM (ch4, 5 V/div.),
time = 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
相关PDF资料 |
PDF描述 |
|---|---|
| A8514KLPTR-T | IC LED DVR WHT 4X80MA 16-ETSSOP |
| A8515GLPTR-T | IC LED DVR WHT/RGB BKLGT 16TSSOP |
| A8516ELPTR-T | IC LED DVR BACKLIGHT MON 24TSSOP |
| A8740EEETR-T | IC PHOTOFLASH CAP CHARGER 8DFN |
| AC162049-2 | MOD PROGR UNIV MPLAB ICD2 ICD3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8513KLYTR-1-T | 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 |
| A8513KLYTR-2-T | 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 |
| A8513KLYTR-3-T | 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 |
| A8513KLYTR-T | 功能描述:IC LED DRVR AUTO BCKLGHT 10MSOP 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 |
| A8514 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8514 is a multi-output white LED driver for small-size LCD backlighting. |
发布紧急采购，3分钟左右您将得到回复。