A8513 データシートの表示（PDF） - Allegro MicroSystems

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A8513

Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

Allegro MicroSystems 

A8513

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

Features and Benefits

• AEC-Q100 Qualified

• Wide input voltage range of 4.5 to 40 V for start/stop,

cold crank and load dump requirements

• Boost converter switching frequency up to 2 MHz,

allowing operation above the AM band

• Excellent input voltage transient response

• Internal secondary OVP for redundant protection

• Fully integrated LED current sink and boost converter with

60 V DMOS FET

• Maximum LED current of 150 mA

• Drives up to 14 series LEDs

• Single EN/PWM pin interface for PWM Dimming and

Enable function

• 5000:1 PWM dimming at 200 Hz

Continued on the next page…

Packages:

Not to scale

16-pin TSSOP

with exposed thermal pad

(LP package)

10-pin MSOP

with exposed thermal pad

(LY package)

Description

The A8513 is a single-output white LED (WLED) driver for

LCD backlighting. It integrates a current-mode boost converter

with an internal power switch and one current sink. The A8513

can operate from a single power supply from 4.5 to 40 V,

to accommodate start/stop, cold crank, and load dump

requirements. A 2 MHz boost converter switching frequency

allows the A8513 to operate above the AM radio band.

If required, the fault flag can be used as part of a circuit to drive

an external P-FET to disconnect the input supply from the system

in the event of a fault. The A8513 provides protection against

output short and overvoltage, open or shorted diode, open or

shorted LED pin, shorted boost switch or inductor, shorted

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 A8513 is provided in a 10-pin MSOP package (suffix LY)

and a 16-pin TSSOP package (suffix LP). Both packages have

an exposed thermal pad for enhanced thermal dissipation, and

are lead (Pb) free, with 100% matte tin leadframe plating.

Applications:

• LCD backlighting for:

▫ Automotive infotainment

▫ Automotive cluster

▫ Automotive center stack

▫ Industrial LCD displays

▫ Portable DVD players

▫ Flatbed Scanners

▫ LED Lighting

VIN

CIN

VC

CVDD

RISET

Typical Application Circuit

L1

D1

VOUT

SW

VIN

A8513 OVP

VDD

PAD

FAULT

ROVP1

ROVP2

EN/PWM

ISET

LED

COMP

GND

CP

COUT

RZ (Optional)

CZ (Optional)

Boost fSW

(MHz)

0.25/0.5/1

2

2

2

2

VIN (min)

(V)

5

10

8

6

5

LEDs per

String (max)

14

14

12

9

7

A8513-DS Rev. 2

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