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A8514

更新时间： 2024-01-31 19:58:48
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器
页数 文件大小 规格书
35页 1288K
描述
The A8514 is a multi-output white LED driver for small-size LCD backlighting.

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A8514 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：TSSOP
包装说明：TSSOP-20针数：20
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：1.71
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：R-PDSO-G20
JESD-609代码：e3长度：6.5 mm
湿度敏感等级：2复用显示功能：NO
功能数量：1区段数：48
端子数量：20最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：HTSSOP封装等效代码：TSSOP20,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260电源：16 V
认证状态：Not Qualified筛选级别：AEC-Q100
座面最大高度：1.2 mm子类别：Display Drivers
最大压摆率：10 mA最大供电电压：40 V
最小供电电压：5 V标称供电电压：16 V
表面贴装：YES温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：4.4 mm
最小 fmax：2.5 MHzBase Number Matches：1

A8514 数据手册

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A8514  
Wide Input Voltage Range, High Efficiency  
Fault Tolerant LED Driver  
Description  
Features and Benefits  
• AEC-Q100 Qualified  
The A8514 is a multi-output white LED driver for small-size  
• Wide input voltage range of 5 to 40 V for 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 VOUT leakage  
• Internal secondary OVP for redundant protection  
• LED current of 80 mA per channel  
• Drives up to 12 series LEDs in 4 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 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)  
LCDbacklighting.Itintegratesacurrent-modeboostconverter  
with internal power switch and four current sinks. The boost  
converter can drive up to 48 LEDs, 12 LEDs per string, at  
80 mA. The LED sinks can be paralleled together to achieve  
even higher LED currents, up to 320 mA. The A8514 can  
operate with a single power supply, from 5 to 40 V, which  
allowstheparttowithstandloaddumpconditionsencountered  
in automotive systems.  
TheA8514candriveanexternalP-FETtodisconnecttheinput  
supply from the system in the event of a fault. The A8514  
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 A8514 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 A8514 to operate above the AM radio band.  
Package: 20-pin TSSOP with exposed  
thermal pad (suffix LP)  
Continued on the next page…  
Applications:  
LCD backlighting or LED lighting for:  
▫ Automotive infotainment  
▫ Automotive cluster  
▫ Automotive center stack  
Not to scale  
Typical Application Circuit  
V
IN  
D1  
2 A / 60 V  
R
L1  
10 μH  
SC  
8 to 16 V  
V
OUT  
0.033 Ω  
Q1  
C
C
C
IN  
R
C
R
OVP  
22 nF  
4.7 μF  
C
OUT  
4.7 μF  
50 V  
R
249 Ω  
ADJ  
20 Ω  
137 kΩ  
50 V  
SW  
GATE  
VSENSE  
OVP  
V
C
VIN  
VDD  
A8514  
C
VDD  
100 kΩ  
0.1 μF  
PAD  
LED1  
LED2  
LED3  
LED4  
COMP  
FAULT  
PWM/EN  
APWM  
ISET  
R
Z
FSET/SYNC  
AGND  
C
P
120 pF  
R
ISET  
150 Ω  
R
10 kΩ  
FSET  
8.25 kΩ  
PGND  
C
Z
0.47 μF  
Figure 1. Application with VIN to ground short protection, using P-MOSFET sensing  
A8514-DS, Rev. 4  
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