- 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： | 13/42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页当前第13页第14页第15页第16页第17页第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
All unused pins should be connected with a 2.37 k Ω resistor to
ground, as shown in figure 5. The unused pin, with the pull-down
resistor, will be taken out of regulation at this point and will not
contribute to the boost regulation loop.
If a LEDx pin is shorted to ground the A8514 will not proceed
with soft start until the short is removed from the LEDx pin. This
In case during operation a fault occurs that will increase the
switching frequency, the FSET/SYNC pin is clamped to a
maximum switching frequency of no more than 3.5 MHz. If the
FSET/SYNC pin is shorted to GND the part will shut down. For
more details see the Fault Mode table later in this datasheet.
prevents the A8514 from powering-up and putting an uncon-
trolled amount of current through the LEDs.
Soft start function
During soft start the LEDx pins are set to sink (I LEDSS ) and the
boost switch current is reduced to the I SWSS(LIM) level to limit
the inrush current generated by charging the output capacitors.
When the converter senses that there is enough voltage on the
LEDx pins the converter proceeds to increase the LED current to
the preset regulation current and the boost switch current limit is
switched to the I SW(LIM) level to allow the A8514 to deliver the
necessary output power to the LEDs. This is shown in figure 6.
C1
C2
C3
C4
Inrush current caused by
enabling the disconnect
switch (when used)
I OUT
I IN
V OUT
Operation during
I SWSS(lim)
Normal operation
I SW(lim)
PWM/EN
Frequency selection
The switching frequency on the boost regulator is set by the resis-
tor connected to the FSET/SYNC pin. The switching frequency
can be can be anywhere from 580 kHz to 2.3 MHz. Figure 7
shows the typical switching frequencies for various resistor
values, with the relationship between R FSET and typical switching
frequency given as:
t
Figure 6. Startup diagram showing the input current, output voltage, and
output current; shows I OUT (ch1, 200 mA/div.), I IN (ch2, 1 A/div.), V OUT
(ch3, 20 V/div.), and PWM/EN (ch4, 5 V/div.), time = 1 ms/div.
2.1
f SW = k / ( R FSET + R INT ), or
R FSET = k / f SW – R INT
(2)
1.9
where R FSET is in in kilohms, f SW is in megahertz, k = 20.9 and
R INT (internal resistance of FSET pin) = 0.6 k Ω .
1.7
1.5
1.3
A8514
LED1
LED2
LED3
A8514
LED1
LED2
LED3
1.1
0.9
0.7
GND
LED4
GND
LED4
0.5
2.37 k Ω
Figure 5. Channel select setup: (left) using only LED1, LED2, and LED3,
and (right) using all four channels.
10 12 14 16 18 20 22 24 26 28 30 32 34 36
Resistance for R FSET (k Ω )
Figure 7. Typical Switching Frequency versus value of R FSET resistor
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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。