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A6274-1

Allegro MicroSystems
Part Number A6274-1
Manufacturer Allegro MicroSystems
Description Linear Current Regulator/Controller
Published Oct 19, 2016
Detailed Description A6274, A6274-1 A6284, A6284-1 Linear Current Regulator and Controller for Automotive LED Arrays FEATURES AND BENEFITS •...
Datasheet PDF File A6274-1 PDF File

A6274-1
A6274-1


Overview
A6274, A6274-1 A6284, A6284-1 Linear Current Regulator and Controller for Automotive LED Arrays FEATURES AND BENEFITS • Six LED current sinks rated up to 60 mA (A6274) or 120 mA (A6284) • Total LED drive current—up to 360 mA or 720 mA • Wide input voltage range of 5 to 42 V for start/stop, cold- crank, and load-dump requirements • Low-dropout voltage—drives two series WLEDs from 7 V input • Gate driver for external ballast P-MOSFET • LEDs combined in two groups with separate ENx and ISETx • LED current level set by external reference resistors • Internal or external PWM dimming • Controlled output drivers slew during PWM for lower EMI • Fault detection features: LED string open, LED pin short-to-ground, single LED short, VOUT short-toground, VIN overvoltage, and thermal protection • Input supply and temperature-based derating • Automotive K-temperature range (–40°C to 150°C) PACKAGES: 20-Pin eTSSOP (LP) with Exposed Thermal Pad AEC-Q100 qualified DESCRIPTION The A6274 and A6284 are programmable linear current regulator ICs for driving automotive LED arrays.
The LED current is programmed by external resistors.
These devices sink up to 60 mA (A6274) or 120 mA (A6284), from each of six LED pins, to drive strings of high-brightness LEDs.
LED pins can be paralleled to drive even higher current LED strings.
Current settings are typically accurate to 2%, while typical matching between LED strings is 0.
8%.
LED light output can be adjusted by PWM dimming.
The ICs provide an internal PWM dimming circuit that is programmed by external resistors for PWM frequency and duty cycle.
It can also accept an external PWM signal.
Multiple ICs can be configured in parallel for larger lighting systems.
An internal FULL (VDR > 3.
6 V) option is provided to override the PWMdimming ratio for full LED current.
LED current derating with temperature and programmable VIN levels allows operation over a wide range of operating conditions.
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APPLICATIONS • Automotive rear c...


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