DS3994 Maxim Integrated Products, DS3994 Datasheet - Page 27

• Manufacturer Part Number: DS3994
• Description: 4-Channel Cold Cathode Fluorescent Lamp Controller
• Manufacturer: Maxim Integrated Products

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DataSheet
4
Figure 13. Typical Operating Circuit
INTERNAL LAMP FREQUENCY OUTPUT
CONFIGURATION
U
EXTERNAL LAMP FREQUENCY INPUT/
NOTE 1: ONLY ONE CHANNEL SHOWN TO SIMPLIFY DRAWING.
NOTE 2: SEE THE COMPONENT SELECTION SECTION FOR RECOMMENDED EXTERNAL COMPONENTS.
R3
.com
INTERNAL DIGITAL PWM OUTPUT
EXTERNAL DIGITAL PWM INPUT/
R4
PORT
ANALOG BRIGHTNESS
R5
R6
V
CC
R7
BRIGHT
PSYNC
LSYNC
LOSC
POSC
FAULT
SDA
SCL
A0
DS3994
____________________________________________________________________
LCMn
OVDn
SVM
GND
GAn
GBn
V
V
CC
Fluorescent Lamp Controller
CC
= 5V ±10%
C1
C5
4-Channel Cold-Cathode
R2
R1
DUAL POWER
MOSFET
Typical Operating Circuits
SUPPLY VOLTAGE
(5V ±10% TO
24V ±10%)
LAMP VOLTAGE MONITOR
LAMP CURRENT MONITOR
TRANSFORMER
C4
C2
C3
CCFL LAMP
R8
27