EUP2983
Typical Application Circuit
Figure 2. WLED Backlight Application
Pin Configurations
Pin Configurations
Package Type
TDFN-8
Pin Description
PIN
1
TDFN-8
DESCRIPTION
PGND Power Ground
2
IN
Input Supply Voltage
Brightness Control Input. LED brightness is controlled by the voltage applied to 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.
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.
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.
3
4
CTRL
FB
5
6
COMP
GND
Analog Ground.
Over voltage Sense. When VOVP is greater than 32V, the internal N-channel MOSFET turns
off until VOVP drops below 30V, then the IC re-enters soft-start. Connect a 2.2µF capacitor
from OVP to PGND.
7
8
OVP
LX
Inductor Connection. This pin is high impedance during shutdown.
DS2983 Ver1.2 Nov. 2008
2
EUTECH [ EUTECH MICROELECTRONICS INC ]
