Datasheet > A6284-1

A6284-1

更新时间： 2024-11-08 01:23:27

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
24页	608K
描述
Linear Current Regulator and Controller for Automotive LED Arrays

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中文翻译

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数据手册

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A6284-1 数据手册

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

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

pinscanbeparalleledtodriveevenhighercurrentLEDstrings.

Current settings are typically accurate to 2%, while typical

matching between LED strings is 0.8%.

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

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 (V_DR> 3.6 V) option is provided to override the PWM-

dimming ratio for full LED current.

• 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-to-

ground, VIN overvoltage, and thermal protection

• Input supply and temperature-based derating

• Automotive K-temperature range (–40°C to 150°C)

LED current derating with temperature and programmable

VIN levels allows operation over a wide range of operating

conditions.

Continued on next page...

PACKAGES:

20-Pin eTSSOP (LP) with Exposed Thermal Pad

AEC-Q100 qualiﬁed

APPLICATIONS

• Automotive rear combination light

• DRL/position

• General automotive lighting

Not to scale

DIM

COMP

FULL

GATE

VIN

OUT

LED1

LED2

LED3

LED4

LED5

LED6

GND

EN1

EN2

EN1

EN2

BIAS

VTH

A6274-84

FFn

PWMIN

ISET1

ISET2

Figure 1: Typical Application Diagram for “-1” Latching Version

A6274-84-DS, Rev. 1

12 3 4 5 6 7...24

中文翻译

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