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DS3994

DS3994

4-Channel Cold-Cathode Fluorescent Lamp Controller

Allows the Implementation of Scanning Backlight Schemes Using Only One CCFL Controller IC

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Overview

Description

The DS3994 is a 4-channel controller for cold-cathode fluorescent lamps (CCFLs) that backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3994's features make it suitable for use in even the largest LCDs, while its low BOM cost makes it ideal for the entire range of LCD TVs and monitors.

The DS3994 can stagger the lamp bursts from each of the four channels. This feature allows scanning backlight schemes for video quality improvement to be implemented using a single CCFL controller IC, making it very simple and inexpensive to provide this enhancement. In addition, staggering the bursts from each channel can be used to minimize current ripple on the display power supply, which is especially important for larger LCDs. The relative stagger between each of the channels is programmable, so this feature can be tailored to the specific application.

The DS3994 uses a push-pull drive architecture but it can also support full and half bridge drive schemes. Contact the factory for more details.
DS3994: Typical Operating Circuit DS3994: Typical Operating Circuit Enlarge+

Key Features

  • High-Density CCFL Controller for LCD TV and PC Monitor Backlights
  • Programmable Staggered Start for Burst Dimming on Each Channel
  • Strike Frequency Boost Option
  • Programmable Strike Time
  • Can Be Easily Cascaded
  • Minimal External Components
  • Analog Brightness Control
  • 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 (±2%) On-Board Oscillator Lamp Frequency (20kHz to 80kHz)
  • Wide Range On-Board DPWM Burst-Dimming Oscillator (22.5Hz to 440Hz)
  • Can Be Synchronized to External Sources for the Lamp and DPWM Frequencies
  • < 10% to 100% Dimming Range
  • Soft-Start Minimizes Audible Transformer Noise
  • I²C-Compatible Serial Port and On-Board Nonvolatile (NV) Memory Allow Device Customization
  • 3-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
  • 28-Pin SO (300 mils) Package

Applications/Uses

  • LCD PC Monitors
  • LCD-TVs

Parametric Specs

See parametric specs for CCFL Controllers (2)


Part NumberVIN
(V)		VIN
(V)		TopologyChannelsDimming InterfaceFreq.Package/PinsOper. Temp.
(°C)		Budgetary
Price
minmaxSee Notes
DS3994 4.55.5Push-Pull4
Analog
DPWM
I2C
SMBus
Fixed PWM
SOIC (W)/28
-40 to +85$1.76 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

App Note 4637 Determining LCM and OVD Thresholds for the DS3xxx CCFL Controllers
App Note 4190 Enhancing the Gate-Drive Capacity of the DS39xx CCFL Controllers
App Note 4147 How to Modify the Soft-Start Profile of the DS3994
App Note 4135 Implementing Analog Dimming on the DS39xx CCFL Controllers
App Note 3898 Calculator Simplifies Programming the Burst Dimming Stagger on the DS3994 Cold-Cathode Fluorescent Lamp (CCFL) Controller
App Note 3835 CCFL Push-Pull Snubber Circuit

Quality And Environmental

Product Reliability Reports: DS3994.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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