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Eutech Microelectronics

EUP2983 Datasheet Preview

EUP2983 Datasheet

White LED Driver

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EUP2983
White LED Driver For
Buck-Boost Application
DESCRIPTION
The EUP2983 is a constant current boost converter
specially designed for driving white LEDs with wide
input range. The unique converter topology provide a
load voltage which can be greater or less than the input
voltage. With the tightly regulated load current, the
EUP2983 allows series connection with multiple
strings of the white LEDs.
The brightness of the LEDs can be adjusted through a
voltage level on the CTRL pin or by applying a PWM
signal to CTRL pin. 1MHz current-mode, pulse-width
modulated (PWM) operation allows for small input and
output capacitors and a small inductor while
minimizing ripple on the input supply/battery.
Programmable soft-start eliminates inrush current
during startup.
The EUP2983 is available in a space-saving, 8-pin
3mm x 3mm TDFN package.
FEATURES
z 6V to 25V Input Range
z 32V (typ.) Output with Overvoltage Protection
z Up to 90% Efficiency
z Flexible Analog or PWM Dimming Control
z Internal High Power MOSFET Switch
z 1MHz PWM Operation
z Small, Low-Profile Inductors and Capacitors
z 3mm× 3mm TDFN-8 Package
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z 7~10 inch White LED Display Backlighting
z 12V Automotive Display System
z PDVD and Subnotebooks
z LED Lighting
Typical Application Circuit
DS2983 Ver1.2 Nov. 2008
Figure 1. High Brightness LEDs Application
1




Eutech Microelectronics

EUP2983 Datasheet Preview

EUP2983 Datasheet

White LED Driver

No Preview Available !

EUP2983Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Typical Application Circuit
Pin Configurations
Package Type
Figure 2. WLED Backlight Application
Pin Configurations
TDFN-8
Pin Description
PIN TDFN-8
DESCRIPTION
1 PGND Power Ground
2 IN Input Supply Voltage
Brightness Control Input. LED brightness is controlled by the voltage applied to CTRL.
3 CTRL Varying the voltage from 0.24V to 1.68V adjusts the brightness from dim to bright,
respectively. Any voltage above 1.68V does not increase brightness.
4
FB
Current-Sense Feedback Input. Connect a resistor from FB to IN to set the LEDs bias
current, The voltage (VFB-VIN) regulates to VCTRL / 10 or 168mV, whichever is lower.
5
COMP
Compensation Input. Connect a 0.1µF capacitor (CCOMP) from COMP to GND. CCOMP
stabilizes the converter and controls soft-start. CCOMP discharges to GND when in shutdown.
6 GND Analog Ground.
Over voltage Sense. When VOVP is greater than 32V, the internal N-channel MOSFET turns
7 OVP off until VOVP drops below 30V, then the IC re-enters soft-start. Connect a 2.2µF capacitor
from OVP to PGND.
8 LX Inductor Connection. This pin is high impedance during shutdown.
DS2983 Ver1.2 Nov. 2008
2


Part Number EUP2983
Description White LED Driver
Maker Eutech Microelectronics
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