A8504 데이터 시트보기 (PDF) - Allegro MicroSystems

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A8504

WLED/RGB Backlight Driver for Medium Size LCDs

Allegro MicroSystems 

A8504

WLED/RGB Backlight Driver for Medium Size LCDs

ELECTRICAL CHARACTERISTICS (continued), valid at TA = –40°C to 85°C, typical values at TA = 25°C, VIN = 5 V, unless

otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ. Max.

LED Current Sinks

LEDx Regulation Voltage

ISET to ILEDx Current Gain

Voltage on ISET Pin

ISET Allowable Current Range

LEDx Accuracy

VLEDx

AISET

VISET

ISET

ErrLEDx

ISET = 83 μA

RISET = 14.7 kΩ; 100% current ratio,

measured as average of LED1 to LED8;

LED1 to LED8 = 0.8 V

–

800

–

–

460

–

–

1.23

–

40

–

100

–

±1.2

–

LEDx Matching

LEDx Switch Leakage Current

LEDx Switch Leakage Current

Soft Start

∆LEDx1

∆LEDx2

ILSleak5

ILSleak21

LED1 to LED6; ISET = 83 μA , 100% current ratio;

LED1 to LED6 = 0.8 V; SEL1=SEL3=VIH;

SEL2=VIL

LED1 to LED8; ISET = 83 μA , 100% current ratio;

LED1 to LED8 = 0.8 V; SEL1=SEL2=SEL3=VIH

VLEDx= 5 V, PWM = 0, TA = 25°C

VLEDx= 21 V, PWM =0

–

±1.3

–

–

–1.7

to 2.5

–

–

–

1

–

1

–

Soft Start Boost Current Limit

Soft Start LEDx Current Limit

Thermal Shutdown Threshold

ISWSS

ILEDSS

TSHDN

Initial soft start current for boost switch

Current through enabled LEDx pins during soft

start, RISET= 14.7 kΩ

40°C hysteresis

-

1.2

-

-

3

-

–

165

–

Units

mV

–

V

μA

%

%

%

μA

μA

A

mA

°C

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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