- 您现在的位置：买卖IC网 > Datasheet目录307 > A8515GLPTR-T (Allegro Microsystems Inc)IC LED DVR WHT/RGB BKLGT 16TSSOP Datasheet资料下载
参数资料
| 型号： | A8515GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 21/34页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BKLGT 16TSSOP |
| 标准包装： | 8,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 2.5MHz |
| 电源电压： | 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°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页第18页第19页第20页当前第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
A8515
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Input overcurrent protection and disconnect switch
The primary function of the input disconnect switch is to protect
the system and the device from catastrophic input currents during
a fault condition. The external circuit implementing the discon-
nect is shown in figure 28. If the input disconnect switch is not
used, the VSENSE pin must be tied to VIN and the GATE pin
must be left open.
When selecting the external PMOS, check for the following
parameters:
? Drain-source breakdown voltage V (BR)DSS > –40 V
meant to prevent catastrophic failure in the system due to a short
of the inductor to GND.
Setting the current sense resistor
The typical threshold for the current sense circuit is 180 mV,
when R ADJ is 0 Ω . This voltage can be trimmed by the R ADJ
resistor. The typical trip point should be set at about 3 A, which
coincides with the cycle-by-cycle current limit minimum thresh-
old. A sample calculation is done below:
Given: 2.85 A of input current, and the calculated maximum
value of the sense resistor, R SC = 0.063 Ω .
? Gate threshold voltage (make sure it is fully conducting at
V GS = -4 V, and cut-off at –1 V)
? R DS(on) : Make sure the on-resistance is rated at V GS = -4.5 V or
similar, not at -10 V; derate it for higher temperature
If the input current level goes above V SENSETRIP of the preset cur-
rent limit threshold, the A8515 will shut down in less than 3 μ s
regardless of user input (see figure 29). This is a latched condi-
tion. The Fault flag is also set to indicate a fault. This feature is
The R SC chosen is 0.056 Ω , a standard.
Also:
R ADJ = ( V SENSETRIP – V ADJ ) / I ADJ
The trip point voltage is calculated as:
V ADJ = 2.85 A × 0.056 Ω = 0.160 V
R ADJ = (0.180 – 0.160 V) / (20.3 μ A) = 1.0 k Ω
(6)
V IN
R SC
Q1
FAULT
C1
R ADJ
GATE
VSENSE
VIN
A8515
C2
GATE
A8515 shuts down
I IN
Figure 28. Typical circuit showing the implementation of the input
C3
disconnect feature.
C4
EN/PWM
t
Figure 29. Typical secondary overcurrent fault condition. I IN is the input
current through the switch. When the current limit is reached the A8515
disables the gate of the disconnect switch (GATE); shows ˉFˉ ˉA ˉUˉˉLˉ ˉTˉ (ch1,
5 V/div.), GATE (ch2, 10 V/div.), I IN (ch3, 2 A/div.), and EN/PWM (ch4, 5 V/
div.), 5 ms/div.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
21
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| AC163020 | ADAPTER PROGRAMMER PIC10F2XX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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. |
| A8516ELPTR-T | 功能描述:IC LED DVR BACKLIGHT MON 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 |
| A8517KLPTR-T | 功能描述:LED 驱动器 IC 10 输出 DC DC 稳压器 升压（升压） PWM 调光 60mA 28-TSSOP-EP 制造商:allegro microsystems, llc 系列:汽车级，AEC-Q100 包装:剪切带（CT） 零件状态:停产 类型:DC DC 稳压器 拓扑:升压（升压） 内部开关:是 输出数:10 电压 - 供电（最低）:4.5V 电压 -?供电（最高）:36V 电压 - 输出:- 电流 - 输出/通道:60mA 频率:400kHz ~ 2.3MHz 调光:PWM 应用:汽车级 工作温度:-40°C ~ 125°C（TA） 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商器件封装:28-TSSOP-EP 标准包装:1 |
发布紧急采购，3分钟左右您将得到回复。