Datasheet > A8518-1

A8518-1

更新时间： 2022-02-26 11:34:59

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

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A8518-1 数据手册

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 V_INfor load dump

• Operates down to 3.9 V_IN(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

V_IN

V_OUT> V_IN

R_SC

R_OVP

R_ADJ

C_IN

C_OUT1

C_OUT2

GATE

VOUT

OVP

VSENSE

VIN

VDD

V_C

C_VDD

A8518

LED1

R_PU

FAULT

PWM

LED2

APWM

COMP

ISET

AGND PGND

R_Z

C_Z

C_P

R_ISET

GND

Typical Application Circuit Showing VOUT-to-Ground Short Protection Using Optional P-Channel MOSFET

A8518-DS, Rev. 4

October 24, 2016

12 3 4 5 6 7...30

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