Datasheet > A8519-1

A8519-1

更新时间： 2022-02-26 10:34:33

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
35页	4309K
描述
Fully integrated 42 V MOSFET for boost converter

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A8519-1 数据手册

A8519 and A8519-1

Wide Input Voltage Range, High-Efficiency,

Fault-Tolerant LED Driver

FEATURES AND BENEFITS

DESCRIPTION

• Automotive AEC-Q100 qualified

• Fully integrated 42 V MOSFET for boost converter

• Fully integrated LED current sinks

• Withstands surge input up to 40 V_INfor load dump

• Operates down to 3.9 V_IN(max) for idle stop

• Drives four strings of LEDs

The A8519 is a multi-output LED driver for small-size LCD

backlighting. It integrates a current-mode boost converter

with internal power switch and four current sinks. The boost

converter can drive up to 44 white LEDs, 11 LED per string, at

100 mA. The LED sinks can be paralleled together to achieve

higher LED currents up to 400 mA. The A8519 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.

• Maximum output voltage 40 V

Up to 11 white LEDs in series

• Drive current for each string is 100 mA

• Programmable boost switching frequency (200 kHz to

2.15 MHz)

• Synchronized boost switching frequency option (260 kHz

to 2.3 MHz)

The A8519 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.

• Dithering of boost switching frequency to reduce EMI

• Extremely high LED contrast ratio

10,000:1 using PWM dimming alone

100,000:1 when combining PWM and analog dimming

Ifrequired,theA8519candriveanexternalP-channelMOSFET

to disconnect input supply from the system in the event of a

fault. The A8519 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…

Packages:

20-Pin TSSOP with

Exposed Thermal Pad

(suffix LP)

28-Pin QFN with

Exposed Thermal Pad

(suffix ET)

Continued on the next page…

APPLICATIONS:

• Automotive infotainment backlighting

• Automotive cluster

• Automotive center stack

Not to scale

Typical Application Diagram

V_IN

Optional

V_OUT> V_IN

R_SC

R_ADJ

R_OVP

C_IN

C_OUT1

C_OUT2

GATE

VOUT

OVP

VSENSE

VIN

VDD

V_C

LED1

LED2

C_VDD

A8519

R_PU

FAULT

PWM

LED3

LED4

APWM

CLKOUT

ISET

COMP

FSET AGND PGND

R_Z

C_Z

C_P

R_ISET

R_FSET

GND

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

A8519-DS, Rev. 7

October 24, 2016

12 3 4 5 6 7...35

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