A8503 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

MFG CO.

A8503

High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver for Medium Displays, with Integrated 55 V Power Switch

Allegro MicroSystems 

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A8503

High Efficiency 6-Channel, 2 MHz, WLED/RGB Driver for

Medium Displays, with Integrated 55 V Power Switch

ELECTRICAL CHARACTERISTICS1 (continued) Valid using circuit shown in figure 1, TA = TJ = 25°C except indicates

specifications guaranteed from −40°C to 105°C, VIN = 5.0 V, EN = PWM = VIH, RISET = 12.4 kΩ, RFSET = 34 kΩ, MODE = AGND,

unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ.2 Max. Unit

Soft Start

Soft Start Boost Current Limit

Soft Start LEDx Current Limit

Soft Start Timeout

ISW(SS)

ILED(SS)

tTO(SS)

Initial soft start current for boost switch

Current through enabled LEDx pins during soft start

The longest duration the boost is allowed to operate

during soft start

–

0.4

–

–

2.6

–

– 131,072 –

A

mA

Clock

Cycles

Thermal Shutdown Threshold

Thermal Shutdown Hysteresis

¯F¯¯A¯¯U¯¯L¯¯T¯ Pin

TSHDN TJ rising

TSHDN(hys)

–

165

–

°C

–

45

–

°C

¯F¯¯A¯U¯¯L¯¯T¯ Pull-Down Voltage

VFAULT

Voltage on ¯F¯¯A¯U¯¯L¯¯T¯ pin with fault enabled, 10 kΩ pull-up

resistor, to 3.3 V

–

–

0.4 V

¯F¯¯A¯U¯¯L¯¯T¯ Pull-Down Resistance

RFAULT

Resistance between ¯F¯¯A¯U¯¯L¯¯T¯ pin and ground with fault

enabled, IFAULT = 100 μA

–

77

–

Ω

1Specifications over the range TA = -40°C to 105°C; guaranteed by design and characterization.

2Typical values are at TA = 25°C.

3LED accuracy is defined as 100 × (ISET × 320 – ILED(av) ) / (ISET × 320), ILED(av) measured as the average of ILED1 through ILED6.

4LED current matching is defined as (ILEDx – ILED(av)) / ILED(av), with ILED(av) as defined in footnote 3.

Allegro MicroSystems, Inc.

6

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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