- 您现在的位置：买卖IC网 > Datasheet目录307 > A8514KLPTR-T (Allegro Microsystems Inc)IC LED DVR WHT 4X80MA 16-ETSSOP Datasheet资料下载
参数资料
| 型号： | A8514KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 18/42页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT 4X80MA 16-ETSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，SEPIC，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： | 白色 LED |
| 频率： | 580kHz ~ 2MHz |
| 电源电压： | 5 V ~ 40 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 20-TSSOP-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页
A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
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. Another limitation is that the propagation
maximum. To keep the internal gain amplifier stable, the user
should not decrease the current through the R ISET resistor to less
than 20 μ A
? For a dual-resistor configuration (panel B of figure 20), the I SET
current is controlled by the following formula:
delay between this APWM signal and I OUT takes several milli-
seconds to change the actual LED current. This effect is shown in
figures 16, 17, and 19.
I SET =
V ISET
R ISET
–
V DAC – V ISET
R 1
(5)
I SET = (4)
Analog dimming
The A8514 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). The limit of this type of dimming depends on
the range of the ISET pin. In the case of the A8514 the limit is
20 to 125 μ A.
? For a single resistor (panel A of figure 20), the ISET current is
controlled by the following formula:
V ISET – V DAC
R ISET
where V ISET is the ISET pin voltage and V DAC is the DAC output
voltage.
When the DAC voltage is 0 V the LED current will be at its
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:
? V DAC = 1.003 V; the output is strictly controlled by R ISET
? V DAC > 1.003 V; the LED current is reduced
? V DAC < 1.003 V; the LED current is increased
LED short detect
Both LEDx pins are capable of handling the maximum V OUT
that the converter can deliver, thus providing protection from the
LEDx pin to V OUT in the event of a connector short.
An LEDx pin that has a voltage exceeding V LEDSC will be
removed from operation (see figure 21). This is to prevent the IC
from dissipating too much power by having a large voltage pres-
ent on an LEDx pin.
DAC
VDAC
GND
R ISET
A8514
ISET
GND
C1
I OUT
(A)
LED1
DAC
VDAC
GND
R1
R ISET
(B)
A8514
ISET
GND
C2
C3
PWM/EN
t
Figure 20. 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).
Figure 21. Example of the disabling of an LED string when the LED pin
voltage is increased above 4.6 V; shows I OUT (ch1, 200 mA/div.), LED1
(ch2, 5 V/div.), and PWM/EN (ch3, 5 V/div.), time = 10 μ s/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
18
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| AC162049 | MODULE SOCKET FOR ICD2 DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8515 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8515 is a multi-output white LED (WLED) driver for LCD backlighting in consumer and industrial displays. |
| A8515GLPTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 16TSSOP 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 |
| A8516 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8516 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. |
| A85169-000 | 制造商:TE Connectivity 功能描述:MPCB-20.0-0-E563 - Cable Rools/Shrink Tubing |
| A8516ELBTR-T | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A8516 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. |
发布紧急采购，3分钟左右您将得到回复。