Datasheet > A80603

A80603

更新时间： 2024-11-07 02:51:23

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
30页	4525K
描述
LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple

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A80603 数据手册

A80603 and A80603-1

LED Driver with Pre-Emptive Boost

for Ultra-High Dimming Ratio and Low Output Ripple

FEATURES AND BENEFITS

DESCRIPTION

The A80603 and A80603-1 are multi-output LED drivers that

integrateacurrent-modeboostconverterwithaninternalpower

switch and four current sinks. The boost converter can drive

four strings of LEDs at up to 120 mA, or LED sinks can be

paralleledtogethertoachievehighercurrentsupto480mAtotal.

• Automotive AEC-Q100 qualified

• Enhanced fault handling for ASIL B system compliance

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

cold crank, and load dump requirements

• Fully integrated LED current sinks and boost converter

with internal power MOSFET

• Operate in Boost or SEPIC mode for flexible output

• Drives up to 11 series white LED in 4 parallel strings, at

up to 120 mA per string (V_F= 3.3 V max).

• Boost switching frequency synced externally or

programmed from 200 kHz to 2.3 MHz

• Clock-Out feature for internal switching frequency

• Adjustable boost frequency dithering to reduce EMI

• Advanced control allows minimum PWM on-time down

to 0.3 µs, and avoids MLCC audible noises

• LED contrast ratio: 15,000:1 at 200 Hz using PWM

dimming alone, 150,000:1 when combining PWM and

analog dimming

The devices operate from single power supply from 4.5 to

40 V; once started, they can continue to operate down to 3.9 V.

This allows the parts to withstand stop/start, cold crank, and

load dump conditions encountered in automotive systems. By

using patented Pre-Emptive Boost control, an LED brightness

contrast ratio of 15,000:1 can be achieved using PWM-only

dimming at 200 Hz. Higher ratios are possible when using a

combination of PWM and analog dimming.

Switching frequency can be either above or below the AM

band, set by either a resistor or the synchronization pin to

between 200 kHz and 2.3 MHz. A programmable dithering

feature further reduces EMI. The Clock-Out pin allows other

converterstobefedtheclockfrequency,includingprogrammed

dithering—even when the LED output is turned off.

Continued on next page...

PACKAGE:

The A80603 provides protection against application faults

and external component open/short. Current sense/gate drive

functionsallowoptionaluseofaninputsupplydisconnectFET

incaseofoutputtogroundshortfaultinboostconfiguration.The

A80603-1 is identical to theA80603 except for soft start timer

and FAULT pin behavior (see Fault Table section for details).

24-Pin 4 mm × 4 mm QFN

with Wettable Flank

Not to scale

V_IN

V_OUT

ꢀoptional

R_SC

C_in

R_ADJ

R_OVP

C_OUT1

C_OUT2

GATE

OVP

PGND

LED1

Vsense

Vin

C_VDD

V_DD

R_PU

FAULT

A80603

LED2

LED3

Up to 11 WLEDs in series

Up to 120 mA/channel

Enable

PWM

APWM

PWM t_ON≥ 0.3 µs

LED4

CLKOUT

AGND

COMP

PEB

FSET

ISET

DITH

APWM 100 kHz 0-90%

R_Z

C_P

R_DITH

C_DITH

R_ISET

R_FSET

R_PEB

C_Z

Figure 1: Typical application diagram showing A80603 in Boost mode

A80603-DS

March 4, 2019

MCO-0000619

12 3 4 5 6 7...30

中文翻译

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与A80603相关器件

型号	品牌	获取价格	描述	数据表
A80603-1	ALLEGRO	获取价格	LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple
A80603KESJSR	ALLEGRO	获取价格	LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple
A80603KESJSR-1	ALLEGRO	获取价格	LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple
A80605	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output R
A80605-1	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output R
A80605KESJSR	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output R
A80605KESJSR-1	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output R
A80606	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost
A80606KEVJSR	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost
A80606KEVJSR-1	ALLEGRO	获取价格	High Power LED Driver with Pre-Emptive Boost

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