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A8507

LED Backlight Driver for LCD Monitors and Televisions

Allegro MicroSystems 

A8507

LED Backlight Driver for LCD Monitors and Televisions

ELECTRICAL CHARACTERISTICS (continued) Valid at VIN = 5 V; TA = 25°C, RFSET = 52 kΩ, RISET = 12.4 kΩ, except indicates

specifications guaranteed over the full operating temperature range with TA = TJ , unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ.1 Max. Unit

Protection Features

Thermal Shutdown Threshold

TTSD

TJ rising

– 165 –

°C

Short Circuit Detect Voltage

VSC

– 18.7 –

V

Output Overvoltage Threshold

VOVP

ROVP = 0

–

36

–

V

OVP Pin Leakage Current2

IOVPLK

VOVP = 22 V, EN = VIL

–

0.1

–

μA

Overvoltage Protection Sense Current2

IOVPH

– 240 –

μA

¯F¯¯A¯¯U¯¯L¯¯T¯ Pin Output Leakage2

IFLT

V=5V

–

–

1

μA

¯F¯¯A¯¯U¯¯L¯¯T¯ Pin Output Voltage

VOL

I = 500 μA

–

– 0.4 V

1Typical specifications are at TA = 25ºC.

2For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing), positive current is defined as going

into the node or pin (sinking).

3LED accuracy is defined as (ISET × 640 – ILED(av)) / (ISET × 640), 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.

5

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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