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A8518KLPTR-T-1 PDF预览

A8518KLPTR-T-1

更新时间: 2024-10-29 01:08:31
品牌 Logo 应用领域
急速微 - ALLEGRO /
页数 文件大小 规格书
30页 1458K
描述
Fully integrated 42 V MOSFET for boost converter

A8518KLPTR-T-1 数据手册

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A8518 and A8518-1  
Wide Input Voltage Range, High-Efficiency,  
Fault-Tolerant LED Driver  
FEATURES AND BENEFITS  
DESCRIPTION  
• Automotive AEC-100 qualified  
The A8518 is a multi-output LED driver for small-size LCD  
backlighting. It integrates a current-mode boost converter  
with internal power switch and two current sinks. The boost  
convertercandriveupto22whiteLEDs, 11LEDsperstring, at  
200 mA. The LED sinks can be paralleled together to achieve  
higher LED currents up to 400 mA. The A8518 operates from  
a single power supply from 4.5 to 40 V, which allows the part  
to withstand load dump conditions encountered in automotive  
systems.  
• Fully integrated 42 V MOSFET for boost converter  
• Fully integrated LED current sinks  
• Withstands surge input to 40 VIN for load dump  
• Operates down to 3.9 VIN (max) for idle stop  
• Drives two strings of LEDs  
• Maximum output voltage 40 V  
Up to 11 white LEDs in series  
• Drive current for each string is 200 mA  
• Fixed 2.15 MHz boost switching frequency  
• Dithering of boost switching frequency to reduce EMI  
(A8518 only)  
• Extremely high LED contrast ratio  
10,000:1 using PWM dimming alone  
100,000:1 when combining PWM and analog dimming  
• Excellent input voltage transient response at lowest  
PWM duty cycle  
• Gate driver for optional P-channel MOSFET input  
disconnect switch  
• LED current accuracy 0.7%  
The A8518 can control LED brightness through a digital  
(PWM) signal. An LED brightness contrast ratio of 10,000:1  
can be achieved using PWM dimming at 100 Hz; a higher ratio  
of 100,000:1 is possible when using a combination of PWM  
and analog dimming.  
Ifrequired,theA8518candriveanexternalP-channelMOSFET  
to disconnect input supply from the system in the event of a  
fault. The A8518 provides protection against output short,  
overvoltage, open or shorted diode, open or shorted LED pin,  
and overtemperature. A cycle-by-cycle current limit protects  
the internal boost switch against high-current overloads.  
Continued on the next page…  
Package: 16-Pin TSSOP with Exposed Thermal  
Pad (suffix LP)  
Continued on the next page…  
APPLICATIONS:  
• Automotive infotainment backlighting  
• Automotive cluster  
• Automotive center stack  
Not to scale  
*optional  
VIN  
L1  
D1  
VOUT > VIN  
RSC  
Q1  
ROVP  
RADJ  
CIN  
COUT1  
COUT2  
GATE  
SW  
VOUT  
OVP  
VSENSE  
VIN  
VDD  
VC  
CVDD  
A8518  
LED1  
RPU  
FAULT  
PWM  
LED2  
APWM  
COMP  
ISET  
AGND PGND  
RZ  
CZ  
CP  
RISET  
GND  
Typical Application Circuit Showing VOUT-to-Ground Short Protection Using Optional P-Channel MOSFET  
A8518-DS, Rev. 4  
October 24, 2016  

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