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DS3984Z

Description
4-Channel Cold-Cathode Fluorescent Lamp Controller
File Size430KB,24 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
Download Datasheet Compare View All

DS3984Z Overview

4-Channel Cold-Cathode Fluorescent Lamp Controller

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.
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
I
2
C-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
I
2
C is a trademark of Philips Corp. Purchase of I
2
C compo-
nents from Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I
2
C Patent Rights to use these components in an I
2
C
system, provided that the system conforms to the I
2
C Standard
Specification as defined by Philips.
DS3984
Applications
LCD Televisions
LCD PC Monitors
Ordering Information
PART
DS3984T
DS3984T+
DS3984Z
DS3984Z+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
32 TQFP
28 SO.300
28 SO.300
+Denotes
lead-free package.
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
28 LSYNC
27 FAULT
26 SCL
25 SDA
24 OVD4
DS3984
23 LCM4
22 GB4
21 GA4
20 OVD3
19 LCM3
18 GB3
17 GA3
16 V
CC
15 GND
28-SO-300
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
______________________________________________
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.

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