eup2589 Eutech Microelectronics Inc, eup2589 Datasheet

eup2589

Manufacturer Part Number

eup2589

Description

12 String White Led Driver With Boost Controller

Manufacturer

Eutech Microelectronics Inc

Datasheet

1.EUP2589.pdf (1 pages)

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DESCRIPTION

The EUP2589 is a high power and high efficiency

boost controller with 12-channel current sinker which

is ideal for large LCD backlighting applications.

EUP2589

architecture which can clamp the inductor peak current

each cycle. The switching frequency is programmable

by an external frequency setting resistor. It drives an

external MOSFET to boost up the output voltage from

a 4.5V to 28V input supply. The EUP2589 regulates

the current in each LED string to the programmed

value set by an external current setting resistor. The

EUP2589 current matching can achieve ±1.5% and

regulation accuracy can reach ±2%.

A 3μA shutdown current and 1.0V (ILED@60mA)

feedback voltage and Maximum 65V output allows for

up to 18 high-power LEDs in series will greatly

improve efficiency and reduce power dissipation.

The device supports pulse width modulation (PWM)

brightness dimming and DC voltage dimming. During

digital PWM dimming, the WLED current is turned

on/off at the duty cycle and frequency determined by

the PWM signal on the PWMI pin. In DC voltage

dimming, LEDs current turn ON/OFF frequency

programmed by the capacitor from BOSC to GND.

The EUP2589 integrated multiple protect functions,

such as LED Open, LED Short, Output Over voltage,

Over thermal, Input Over current, and Under voltage

lockout (UVLO), these protection will prevent the

LCD backlight from damage.

DS2589 Ver1.0 Nov. 2010

Typical Application Circuit

uses

current

mode,

12 String White LED Driver

fixed

Figure 1. Typical Application circuits

frequency

With Boost Controller

FEATURES

APPLICATIONS

3μA shutdown current

12 strings in parallel and up to 18 LEDs per

string

External PWM or DC Voltage Dimming

Control

Output voltage up to 65V

Wide Input voltage range 4.5V to 28V

Better than 1.5% LED Current Regulation

Accuracy Between Strings

Boost Switching frequency can be programmed

by external resistor

Multiple Fault Protections

LED current turn off in shutdown mode

Integrated UVLO/ Over Thermal protection

Minimal 0.5μs LED On-Time regulation

Thermal Enhanced 28pin TSSOP28 Package

RoHS Compliant and 100% Lead (Pb)-Free

Halogen-Free

LCD Monitor LED Backlighting

LCD-TV LED Backlighting

-Current Limit protection

-Output Short circuit detection

-Over-temperature protection

-Output Over-voltage protection

EUP2589

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