SP7616EB【PDF 1/11 页】EVAL BOARD FOR SP7616

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S P 7 6 1 6

H i g h A c c u r a c y 4 - C h a n n e l L o w S i d e L E D D r i v e r f o r

C C F L R e p l a c e m e n t

May 2009

GENERAL DESCRIPTION

The SP7616 is a 30V 4-Channel linear low side

LED driver. It is capable of powering up to four

LED strings of nine LEDs @ 60mA per string

for a total of 36 LEDs with 1.5% typical

current matching between channels. The

desired LED current can be adjusted with an

external resistor, and the precision string-to-

string current matching ensures consistent

color temperature across the whole display.

The device also features very low dropout

voltage to maximize system efficiency and

avoid difficult thermal design constraints.

Dimming can be achieved by feeding a PWM

signal to the PWM pin, or use an analog signal

to control the ISET current, this allows

brightness control without unwanted color

shifts. Fast LED current turn-on/off time allows

up to 5 kHz PWM dimming frequencies with as

low as 10% duty cycle, completely eliminating

flicker. The built-in thermal protection

prevents damage to the device under fault

conditions.

Rev. 2.0.4

APPLICATIONS

? CCFL replacement in TFT displays

? Panel backlighting

? Casino gaming light systems

? Advertising backlighting

FEATURES

? Wide 4.5V to 30V operating range

? 60mA LED current per channel

? 1.5% channel to channel current

matching

? Analog Dimming control

? PWM operation up to 5kHz with 10%

Duty Cycle

? Low dropout: 150mV @ 20mA

? Built-in Over Temperature Protection

? Small 2X3mm DFN package

? Lead Free, RoHS Compliant

TYPICAL APPLICATION DIAGRAM

Fig. 1: SP7616 Application Diagram

Exar Corporation

48720 Kato Road, Fremont CA 94538, USA

www.exar.com

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

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