芯美电子
Typical Application Circuit
EUP2983
Figure 2. WLED Backlight Application
Pin Configurations
Package Type
Pin
Configurations
TDFN-8
Pin Description
PIN
1
2
3
4
5
6
7
8
DS2983
Ver1.0
TDFN-8
PGND
IN
CTRL
FB
COMP
GND
OVP
LX
Feb. 2008
DESCRIPTION
Power Ground
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 (V
FB
-V
IN
) regulates to V
CTRL
/ 10 or 168mV, whichever is lower.
Compensation Input. Connect a 0.1µF capacitor (C
COMP
) from COMP to GND. C
COMP
stabilizes the converter and controls soft-start. C
COMP
discharges to GND when in shutdown.
Analog Ground.
Over voltage Sense. When V
OVP
is greater than 30V, the internal N-channel MOSFET turns
off until V
OVP
drops below 28V, then the IC re-enters soft-start. Connect a 2.2µF capacitor
from OVP to PGND.
Inductor Connection. This pin is high impedance during shutdown.
2
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ETC [ ETC ]
