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Eutech Microelectronics

EUP2592 Datasheet Preview

EUP2592 Datasheet

8-String White LED Driver

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EUP2592
8-String White LED Driver for LCD
Panel Application
DESCRIPTION
The EUP2592 is an 8-channel WLED driver that
controls WLED current for LCD backlight application.
The EUP2592 is capable of driving up to eight strings
in parallel and 12 LEDs per string. Each string is
terminated with ballast that achieves ±1.5% current
regulation accuracy between strings, ensuring even
LED brightness. The EUP2592 have wide input
voltage range from 4.5V to 28V, and provide
adjustable 5mA to 50mA LED current. EUP2592 uses
an external PWM signal to control WLED dimming.
EUP2592 has built in many fault protections.
The EUP2592 step-up controller features an internal
150m(typ.), 48V (max.) power MOSFET with local
current-sense amplifier for accurate cycle-by-cycle
current limit. This architecture greatly simplifies the
external circuitry and saves PCB space. The EUP2592
minimizes the headroom voltage of output and power
loss by detecting the highest LED forward voltage
dynamically. Low-feedback voltage at each LED string
360mV (typ.) at 20mA LED current helps reduce
power loss and improve efficiency.
The EUP2592 internally generates a PWM signal for
accurate WLED dimming control. The PWM
frequency is resistor programmable, while PWM duty
cycle is controlled directly from an external PWM
signal or through an adjustable resistor at PWMO pin.
This internal PWM dimming control provides a
dimming range with 8-bit resolution to maximize
battery life. The EUP2592 WLED brightness can also
be directly modulated with an external PWM signal
from 100Hz to 10kHz.
The EUP2592 have extensive protection that include
string open and short detection, over voltage protection,
over-temperature protection and an optional input
over-current protection with an external fault
disconnect switch.
FEATURES
Up to 8 strings in parallel and 12 LEDs per
string Maximum number of LEDs that can be
driven is 96 (8x12) WLEDs
Accurate PWM Dimming Control with 8-bit
Resolutions
External Direct PWM Dimming Control Mode
Wide Input Voltage Range 4.5V to 28V
Internal 0.1548V Power MOSFET
±1.5% LED Current Regulation Accuracy
Between Strings
Dynamic Headroom Control for LED Outputs
Low String Feedback Voltage: 360mV at 20mA
LED Current
User Selectable Switching Frequency 500kHz
and 1200kHz
Multiple Fault Protections
-LED Open Circuit Detection
-LED Short Circuit Detection
-Over-Temperature Protection
-Output Over-Voltage Protection
-Input over current protection
Small 24-Pin, 4mm x 4mm, Thin TQFN
Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Notebook Displays LED Backlighting
LCD Monitor LED Backlighting
DS2592 Ver1.1_SZ Jan. 2010
1




Eutech Microelectronics

EUP2592 Datasheet Preview

EUP2592 Datasheet

8-String White LED Driver

No Preview Available !

Typical Application Circuit
EUP2592Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Figure 1. External Direct PWM Dimming Control with An External PWM Signal
Figure 2. Internal PWM Dimming Control with An External PWM Signal
DS2592 Ver1.1_SZ Jan. 2010
2


Part Number EUP2592
Description 8-String White LED Driver
Maker Eutech Microelectronics
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EUP2592 Datasheet PDF






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