DS3992 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Two-Channel, Push-Pull CCFL Controller

Rev 0; 9/06
Two-Channel, Push-Pull CCFL Controller
General Description
The DS3992 is a low-cost, two-channel controller for
cold-cathode fluorescent lamps (CCFLs) that are used
to backlight liquid crystal displays (LCDs). The DS3992
can drive multiple CCFLs per channel, making it ideal
for 4- and 6-lamp LCD PC monitor and TV applications.
The DS3992 uses a push-pull drive scheme to convert a
DC voltage (5V to 24V) to the high voltage (300V_RMS to
1400V_RMS) AC waveform that is required to power the
CCFLs. The push-pull drive scheme uses a minimal
number of external components, which reduces compo-
nent and assembly cost and makes the printed circuit
board (PC board) design easy to implement. The push-
pull drive scheme also provides an efficient DC-to-AC
conversion and produces near-sinusoidal waveforms.
LCD PC Monitors
LCD-TVs
Applications
Features
o Two-Channel CCFL Controller for Backlighting
LCD Panels for PC Monitors and LCD-TVs
o Minimal BOM Provides Low-Cost Inverter Solution
o Per-Channel Lamp Fault Monitoring for Lamp-
Open, Lamp Overcurrent, Failure to Strike, and
Overvoltage Conditions
o Accurate (±10%) On-Board Oscillator for Lamp
Frequency (40kHz to 80kHz)
o Accurate (±10%) On-Board Oscillator for DPWM
Burst-Dimming Frequency (90Hz to 220Hz or
180Hz to 440Hz)
o Device Supply Undervoltage Lockout
o Inverter Supply Undervoltage Lockout
o Burst-Dimming Soft-Start Minimizes Audible
Transformer Noise
o Strike Frequency Boost
o 100% to < 10% Dimming Range
o 4.5V to 5.5V Single-Supply Operation
o -40°C to +85°C Temperature Range
o 16-Pin SO Package (150 mils)
Ordering Information
PART
TEMP RANGE
DS3992Z-09P+
DS3992Z-09N+
DS3992Z-18P+
DS3992Z-18N+
DS3992Z-09P+T&R
DS3992Z-09N+T&R
DS3992Z-18P+T&R
DS3992Z-18N+T&R
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
+Denotes lead-free package.
T&R denotes tape-and-reel package.
DIMMING
FREQUENCY RANGE
90Hz to 220Hz
90Hz to 220Hz
180Hz to 440Hz
180Hz to 440Hz
90Hz to 220Hz
90Hz to 220Hz
180Hz to 440Hz
180Hz to 440Hz
BRIGHT POLARITY PIN-PACKAGE
Positive
Negative
Positive
Negative
Positive
Negative
Positive
Negative
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
Pin Configuration
Typical Operating Circuits appear at end of data sheet.
TOP VIEW
LOSC 1
POSC ²
BRIGHT 3
SVM 4
GA1 5
GB1 6
LCM1 7
OVD1 8
DS3992
SO-150
16 VCC
15 V_CC
14 OVD2
13 LCM2
12 GB2
11 GA2
10 V_CC
9 GND
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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