A8514KLPTR-T Allegro Microsystems Inc, A8514KLPTR-T Datasheet

A8514KLPTR-T

Manufacturer Part Number

A8514KLPTR-T

Description

IC LED DVR WHT 4X80MA 16-ETSSOP

Manufacturer

Allegro Microsystems Inc

Datasheets

1.A8514KLPTR-T.pdf (32 pages)

2.A8514KLPTR-T.pdf (35 pages)

Specifications of A8514KLPTR-T

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

A8514KLPTR-T

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

Current page: 1 of 32
Download datasheet (2Mb)

Features and Benefits

• Wide input voltage range of 5 to 40 V for start/stop, cold

• Fully integrated LED current sinks and boost converter

• Sync function to synchronize boost converter switching

• Excellent input voltage transient response

• Single resistor primary OVP minimizes V

• 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

• Provides driver for optional external PMOS input

• Extensive protection against:

Package: 20-pin TSSOP with exposed

thermal pad (suffix LP)

A8514-DS

crank and load dump requirements

with 60 V DMOS

frequency up to 2.3 MHz, allowing operation above the

AM band

disconnect switch

▫ Shorted boost switch or inductor

▫ Shorted FSET or ISET resistor

▫ Shorted output

▫ Open or shorted LED pin

▫ Open boost Schottky

▫ Overtemperature (OTP)

4.7 μF

50 V

100 kΩ

8 to 16 V

0.03 Ω

243 Ω

ADJ

8.25 kΩ

ISET

Figure 1. Application with VIN to ground short protection, using optional P-MOSFET sensing

20 Ω

0.01 μF

VDD

22 nF

10 kΩ

Wide Input Voltage Range, High Efficiency

FSET

OUT

Typical Application Circuit

Not to scale

leakage

GATE

VSENSE

VIN

VDD

FAULT

PWM/EN

APWM

FSET/SYNC

ISET

10 μH

AGND

A8514

PAD

PGND

Description

The A8514 is a multi-output white 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 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

allows the part to withstand load dump conditions encountered

in automotive systems.

If required, the A8514 can drive an external P-FET to

disconnect the input 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.

Continued on the next page…

Applications:

LCD backlighting or LED lighting for:

▫ Automotive infotainment

▫ Automotive cluster

▫ Automotive center stack

COMP

LED1

LED2

LED3

LED4

OVP

Fault Tolerant LED Driver

150 kΩ

120 pF

OVP

4.7 μF

50 V

150 Ω

OUT

0.47 μF

4.7 μF

50 V

OUT

A8514

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