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DS3992Z-09N+

P1-P3P4-P6P7-P9P10-P12P13-P13
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.
Applications
LCD PC Monitors
LCD-TVs
Features
Two-Channel CCFL Controller for Backlighting
LCD Panels for PC Monitors and LCD-TVs
Minimal BOM Provides Low-Cost Inverter Solution
Per-Channel Lamp Fault Monitoring for Lamp-
Open, Lamp Overcurrent, Failure to Strike, and
Overvoltage Conditions
Accurate (±10%) On-Board Oscillator for Lamp
Frequency (40kHz to 80kHz)
Accurate (±10%) On-Board Oscillator for DPWM
Burst-Dimming Frequency (90Hz to 220Hz or
180Hz to 440Hz)
Device Supply Undervoltage Lockout
Inverter Supply Undervoltage Lockout
Burst-Dimming Soft-Start Minimizes Audible
Transformer Noise
Strike Frequency Boost
100% to < 10% Dimming Range
4.5V to 5.5V Single-Supply Operation
-40°C to +85°C Temperature Range
16-Pin SO Package (150 mils)
DS3992
Two-Channel, Push-Pull CCFL Controller
______________________________________________
Maxim Integrated Products
1
1
2
SO-150
TOP VIEW
3
4
5
6
7
8
14
13
16
15
12
11
10
9
OVD2
LCM1
OVD1
GA2
V
CC
V
CC
GA1
GB1
POSC
LOSC
GB2
V
CC
GND
SVM
BRIGHT
LCM2
DS3992
Pin Configuration
Rev 0; 9/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+
Denotes lead-free package.
T&R denotes tape-and-reel package.
Ordering Information
PART TEMP RANGE
DIMMING
FREQUENCY RANGE
BRIGHT POLARITY PIN-PACKAGE
DS3992Z-09P+ -40°C to +85°C 90Hz to 220Hz Positive 16 SO-16 (150 mils)
DS3992Z-09N+ -40°C to +85°C 90Hz to 220Hz Negative 16 SO-16 (150 mils)
DS3992Z-18P+ -40°C to +85°C 180Hz to 440Hz Positive 16 SO-16 (150 mils)
DS3992Z-18N+ -40°C to +85°C 180Hz to 440Hz Negative 16 SO-16 (150 mils)
DS3992Z-09P+T&R -40°C to +85°C 90Hz to 220Hz Positive 16 SO-16 (150 mils)
DS3992Z-09N+T&R -40°C to +85°C 90Hz to 220Hz Negative 16 SO-16 (150 mils)
DS3992Z-18P+T&R -40°C to +85°C 180Hz to 440Hz Positive 16 SO-16 (150 mils)
DS3992Z-18N+T&R -40°C to +85°C 180Hz to 440Hz Negative 16 SO-16 (150 mils)
Typical Operating Circuits appear at end of data sheet.
DS3992
Two-Channel, Push-Pull CCFL Controller
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage on V
CC
Relative to Ground.......................-0.5V to +6.0V
Voltage on Any Leads Other
Than V
CC
..............0.5V to (V
CC
+ 0.5V), not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...................See J-STD-020 Specification
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
(Note 1) 4.5 5.5 V
SVM Voltage Range V
SVM
-0.3
V
CC
+
0.3
V
BRIGHT Voltage Range V
BRIGHT
-0.3
V
CC
+
0.3
V
LCM Voltage Range V
LCM
(Note 2) -0.3
V
CC
+
0.3
V
OVD Voltage Range V
OVD
(Note 2) -0.3
V
CC
+
0.3
V
Gate-Driver Output Charge Loading Q
G
20 nC
ELECTRICAL CHARACTERISTICS
(V
CC
= +4.5V to +5.5V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current I
CC
G
A
, G
B
loaded with 600pF, 2 channels
active
816mA
Low-Level Output Voltage (GA, GB) V
OL
I
OL
= 4mA 0.4 V
High-Level Output Voltage (GA, GB) V
OH1
I
OH1
= -1mA
V
CC
-
0.4
V
UVLO Threshold: V
CC
Rising V
UVLOR
4.3 V
UVLO Threshold: V
CC
Falling V
UVLOF
3.7 V
UVLO Hysteresis V
UVLOH
100 mV
SVM Falling-Edge Threshold V
SVM
1.9 2.0 2.1 V
SVM Hysteresis V
SVMH
150 mV
LCM and OVD DC Bias Voltage V
DCB
1.35 V
LCM and OVD Input Resistance R
DCB
50 kΩ
Lamp-Off Threshold V
LOT
(Note 3) 1.65 1.75 1.85 V
Lamp Over Current V
LOC
(Note 3) 3.15 3.35 3.55 V
Lamp Regulation Threshold V
LRT
(Note 3) 2.25 2.35 2.45 V
OVD Threshold V
OVDT
(Note 3) 2.25 2.35 2.45 V
Lamp Frequency Range f
LFS:OSC
40 80 kHz
DS3992
Two-Channel, Push-Pull CCFL Controller
_____________________________________________________________________ 3
Note 1: All voltages are referenced to ground unless otherwise noted. Currents into the I.C. are positive, out of the I.C. negative.
Note 2: During fault conditions, the AC-coupled feedback values are allowed to be below the Absolute Maximum Rating of the LCM or
OVD pin for up to 1s.
Note 3: Voltage with respect to V
DCB.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.5V to +5.5V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Lamp Frequency Tolerance f
LFS:TOL
LOSC resistor ±2% over temperature -10 +10 %
DS3992Z-09P/N 90 220
DPWM Frequency Range f
DSR:OSC
DS3992Z-18P/N 180 440
Hz
DPWM Frequency Tolerance f
DSR:TOL
POSC resistor ±2% over temperature -10 +10 %
DS3992Z-09P / DS3992Z-18P 0.5
BRIGHT Voltage:
Minimum Brightness
V
BMIN
DS3992Z-09N / DS3992Z-18N 2.0
V
DS3992Z-09P / DS3992Z-18P 2.0
BRIGHT Voltage:
Maximum Brightness
V
BMAX
DS3992Z-09N / DS3992Z-18N 0.5
V
Gate-Driver Output Rise/Fall Time t
R
/ t
F
C
L
= 600pF 50 100 ns
GAn and GBn Duty Cycle 44 %
Strike Time t
STRIKE
500 ms
Typical Operating Characteristics
(V
CC
= 5.0V, T
A
= +25°C, unless otherwise noted.)
4.0
5.0
4.5
6.0
5.5
7.0
6.5
7.5
8.5
8.0
9.0
4.5 4.7 4.8 4.94.6 5.0 5.1 5.2 5.45.3 5.5
ACTIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS3992 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
DPWM = 10%
DPWM = 50%
DPWM = 100%
SVM ≤ 2V
GATE Q
C
= 3.5nC
f
LFOSC
= 64kHz
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
-40.0 22.5 85.0
ACTIVE SUPPLY CURRENT
vs. TEMPERATURE
DS3992 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
CC
= 5.5V
GATE Q
C
= 3.5nC
f
LFOSC
= 64kHz
DPWM = 100%
V
CC
= 5.0V
V
CC
= 4.5V
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
-40.0 22.5 85.0
INTERNAL FREQUENCY CHANGE
vs. TEMPERATURE
DS3992 toc03
TEMPERATURE (°C)
FREQUENCY CHANGE (%)
DPWM
FREQUENCY
LAMP
FREQUENCY
P1-P3P4-P6P7-P9P10-P12P13-P13

DS3992Z-09N+

Mfr. #:
Buy DS3992Z-09N+
Manufacturer:
Maxim Integrated
Description:
Display Drivers & Controllers 2Ch Push-Pull CCFL Controlle
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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