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Dallas Semiconducotr

DS3984 Datasheet Preview

DS3984 Datasheet

4-Channel Cold-Cathode Fluorescent Lamp Controller

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Rev 0; 4/05
4-Channel Cold-Cathode
Fluorescent Lamp Controller
General Description
The DS3984 is a 4-channel controller for cold-cathode
fluorescent lamps (CCFLs) used to backlight liquid
crystal displays (LCDs) in TV and PC monitor applica-
tions. The DS3984 supports configurations of 1 to 4
lamps, and multiple DS3984 controllers can be cascad-
ed to support applications requiring more than 4 lamps.
LCD Televisions
LCD PC Monitors
Applications
Ordering Information
PART
TEMP RANGE
DS3984T
-40°C to +85°C
DS3984T+
-40°C to +85°C
DS3984Z
-40°C to +85°C
DS3984Z+
-40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
32 TQFP
32 TQFP
28 SO.300
28 SO.300
Pin Configurations
TOP VIEW
LOSC 1
A0 2
PSYNC 3
POSC 4
BRIGHT 5
SVM 6
GA1 7
GB1 8
LCM1 9
OVD1 10
GA2 11
GB2 12
LCM2 13
OVD2 14
DS3984
28-SO-300
28 LSYNC
27 FAULT
26 SCL
25 SDA
24 OVD4
23 LCM4
22 GB4
21 GA4
20 OVD3
19 LCM3
18 GB3
17 GA3
16 VCC
15 GND
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Features
High-Density CCFL Controller for LCD TV and PC
Monitor Backlights
Can Be Easily Cascaded to Support More Than
4 Lamps
Minimal External Components
Analog Brightness Control
Per-Channel Lamp Control Ensures Equal
Brightness Among Lamps and Maximizes Lamp
Life
Gate Driver Phasing Minimizes DC Supply Current
Surges
Per-Channel Lamp Fault Monitoring for Lamp
Open, Lamp Overcurrent, Failure to Strike, and
Overvoltage Conditions
Accurate (±5%) Independent On-Board Oscillators
for Lamp Frequency (40kHz to 80kHz) and DPWM
Burst Dimming Frequency (22.5Hz to 440Hz)
Can Be Synchronized to External Sources for the
Lamp and DPWM Frequencies
<10% to 100% Dimming Range
Programmable Soft-Start Minimizes Audible
Transformer Noise
I2C-Compatible Serial Port and On-Board
Nonvolatile (NV) Memory Allow Device
Customization
8-Byte NV User Memory for Storage of Serial
Numbers and Date Codes
4.5V to 5.5V Single-Supply Operation
-40°C to +85°C Temperature Range
32-Lead TQFP (7mm x 7mm) Package or
28-Pin SO (300 mils) Package
I2C is a trademark of Philips Corp. Purchase of I2C compo-
nents from Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I2C Patent Rights to use these components in an I2C
system, provided that the system conforms to the I2C Standard
Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
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.




Dallas Semiconducotr

DS3984 Datasheet Preview

DS3984 Datasheet

4-Channel Cold-Cathode Fluorescent Lamp Controller

No Preview Available !

4-Channel Cold-Cathode
Fluorescent Lamp Controller
ABSOLUTE MAXIMUM RATINGS
Voltage on VCC, SDA, and SCL
Relative to Ground.............................................-0.5V to +6.0V
Voltage on Leads Other than VCC,
SDA, and SCL…………………………..-0.5V to (VCC + 0.5V),
not to exceed +6.0V
Operating Temperature Range ...........................-40°C to +85°C
EEPROM Programming Temperature Range .........0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature...................See J-STD-020 Specification
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.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +85°C.)
PARAMETER
Supply Voltage
Input Logic 1
SYMBOL
VCC (Note 1)
VIH
CONDITIONS
MIN
4.5
0.7 x
VCC
TYP
MAX
5.5
VCC +
0.3
UNITS
V
V
Input Logic 0
SVM Voltage Range
VIL
VSVM
-0.3
0.3 x
VCC
V
-0.3
VCC +
V
0.3
BRIGHT Voltage Range
VBRIGHT
-0.3
VCC +
V
0.3
LCM Voltage Range
VLCM (Note 2)
-0.3
VCC +
V
0.3
OVD Voltage Range
VOVD (Note 2)
-0.3
VCC +
V
0.3
Gate-Driver Output Charge
Loading
QG
20 nC
ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
Supply Current
Input Leakage (Digital Pins)
Output Leakage (SDA, FAULT)
Low-Level Output Voltage
(SDA, Fault)
Low-Level Output Voltage
(PSYNC, LSYNC)
ICC
IL
ILO
VOL1
VOL2
VOL3
GA, GB loaded with 600pF,
4 channels active
High impedance
IOL1 = 3mA
IOL2 = 6mA
IOL3 = 4mA
Low-Level Output Voltage
(GA, GB)
VOL4 IOL4 = 4mA
High-Level Output Voltage
(PSYNC, LSYNC)
VOH1 IOH1 = -1mA
MIN TYP MAX UNITS
12 16 mA
-1.0
+1.0
µA
-1.0
+1.0
µA
0.4
V
0.6
0.4 V
0.4 V
VCC - 0.4
V
2 _____________________________________________________________________


Part Number DS3984
Description 4-Channel Cold-Cathode Fluorescent Lamp Controller
Maker Dallas Semiconducotr
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DS3984 Datasheet PDF






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