EUP2589 Datasheet, PDF (1/1 Pages) Eutech Microelectronics Inc – 12 String White LED Driver With Boost Controller

EUP2589
12 String White LED Driver
With Boost Controller
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 uses current mode, fixed frequency
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.
Typical Application Circuit
FEATURES
z 3μA shutdown current
z 12 strings in parallel and up to 18 LEDs per
string
z External PWM or DC Voltage Dimming
Control
z Output voltage up to 65V
z Wide Input voltage range 4.5V to 28V
z Better than 1.5% LED Current Regulation
Accuracy Between Strings
z Boost Switching frequency can be programmed
by external resistor
z Multiple Fault Protections
-Current Limit protection
-Output Short circuit detection
-Over-temperature protection
-Output Over-voltage protection
z LED current turn off in shutdown mode
z Integrated UVLO/ Over Thermal protection
z Minimal 0.5μs LED On-Time regulation
z Thermal Enhanced 28pin TSSOP28 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
z LCD Monitor LED Backlighting
z LCD-TV LED Backlighting
DS2589 Ver1.0 Nov. 2010
Figure 1. Typical Application circuits
1