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| 型号： | A8502KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/35页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE MULTI 16-TSSOP |
| 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： | 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： | 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 ~ 125°C |
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A8502
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Features and Benefits
? AEC-Q100 qualified
? Wide input voltage range of 5 to 40Vfor start/stop, cold
crank and load dump requirements
? Fully integrated LED current sinks and boost converter
with 60 V DMOS
? Sync function to synchronize boost converter switching
frequency up to 2.3 MHz, allowing operation above the
AM band
? Excellent input voltage transient response
? Single resistor primary OVP minimizes V OUT leakage
? Internal secondary OVP for redundant protection
? LED current of 120 mA per channel
? Drives up to 12 series LEDs in 2 parallel strings
? 0.7% to 0.8% LED to LED matching accuracy
? PWM and analog dimming inputs
? 5000:1 PWM dimming at 200 Hz
? Provides driver for optional external PMOS input
disconnect switch
? Extensive protection against:
? Shorted boost switch or inductor
? Shorted FSET or ISET resistor
? Shorted output
? Open or shorted LED pin
? Open boost Schottky
? Overtemperature (OTP)
Package: 16-pin TSSOP with exposed
thermal pad (suffix LP)
Not to scale
Description
The A8502 is a multi-output white LED driver for small-size
LCD backlighting. It integrates a current-mode boost converter
with internal power switch and two current sinks. The boost
converter can drive up to 24 LEDs, 12 LEDs per string, at
120 mA. The LED sinks can be paralleled together to achieve
even higher LED currents, up to 240 mA. The A8502 can
operate with a single power supply, from 5 to 40 V, which
allows the part to withstand load dump conditions encountered
in automotive systems.
If required, the A8502 can drive an external P-FET to
disconnect the input supply from the system in the event of
a fault. The A8502 provides protection against output short
and overvoltage, open or shorted diode, open or shorted LED
pin, shorted boost switch or inductor, shorted FSET or ISET
resistor, and IC overtemperature. A dual level cycle-by-cycle
current limit function provides soft start and protects the internal
current switch against high current overloads.
The A8502 has a synchronization pin that allows PWM
switching frequencies to be synchronized in the range of
580 kHz to 2.3 MHz. The high switching frequency allows
the A8502 to operate above the AM radio band.
Continued on the next page…
Applications:
LCD backlighting or LED lighting for:
? Automotive infotainment
? Automotive cluster
? Automotive center stack
Typical Application Circuit
V IN
10 to 14 V
R SC
0.033 Ω
Q1
L1
10 μ H
D1
2 A / 60 V
V OUT
C IN
4.7 μ F
50 V
R ADJ
249 Ω
R C
20 Ω
C C
22 nF
GATE
VSENSE
SW
OVP
R OVP
137 k Ω
C OUT
4.7 μ F
50 V
100 k Ω
V C
C VDD
0.1 μ F
VIN
VDD
A8502
PAD
LED1
FAULT
PWM/EN
APWM
LED2
R ISET
8.25 k Ω
R FSET
10 k Ω
ISET
FSET/SYNC
AGND
COMP
PGND
C P
120 pF
R Z
120 Ω
C Z
0.47 μ F
Figure 1. Application with VIN to ground short protection, using optional P-MOSFET sensing
A8502-DS, Rev. 3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8503 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver |
| A8503EECTR-T | 功能描述:IC LED DRVR WHT/RGB BCKLGT 26QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，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:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| A8503GECTR-T | 功能描述:IC LED DVR WHT/RGB BKLGT 26QFN 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 |
| A8504 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:WLED/RGB Backlight Driver for Medium Size LCDs |
| A8504910100N | 功能描述:环形MIL规格后盖 Backshell, Envrn, EMI/RFI, Strt, Nickel, Size 48 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
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