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DS3991

Low-Cost CCFL Controller

Full-Featured Single-Channel CCFL Controller

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The DS3991 is a controller for cold-cathode fluorescent lamps (CCFLs) that are used to backlight liquid-crystal displays (LCDs). The DS3991 is available for both push-pull and half-bridge drive topologies.

The DS3991 converts 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 and halfbridge drive schemes use a minimal number of external components, which reduces component and assembly cost and makes the printed circuit board (PCB) design easy to implement. Both drive schemes provide an efficient DC to AC conversion and produce near-sinusoidal waveforms.

Data Sheet

Download	Rev 1	(PDF, 484kB)
E-Mail

Key Features

CCFL Controller for Backlighting LCD Panels
Minimal External Components Required
Lamp Fault Monitoring for Lamp-Open, Lamp-Overcurrent, Failure-to-Strike, and Overvoltage Conditions
Accurate (±5%) On-Board Oscillator for Lamp Frequency (40kHz to 80kHz)
Accurate (±5%) On-Board Oscillator for DPWM Burst-Dimming Frequency (80Hz to 300Hz)
Device Supply Undervoltage Lockout
Inverter Supply Undervoltage and Overvoltage Lockouts
Soft-Start on Burst-Dimming Minimizes Audible Transformer Noise
Strike Frequency Boost
100% to < 10% Dimming Range
Low Cost
Single-Supply Operation Range: 4.5V to 5.5V
Temperature Range: -40°C to +85°C
16-Pin SO Package (150 mils)

Applications/Uses

LCD Monitors
LCD TVs

Key Specifications:

CCFL Controllers

Part Number

V_IN
(V)

Topology

Channels

Dimming Interface

Freq.

EV Kit

Industry Qualified

Package/Pins

Smallest Available Pckg.
(mm²)

Oper. Temp.
(°C)

min

max

max w/pins

DS3991

4.5

Half-Bridge

Push-Pull

Analog

DPWM

Fixed PWM

Automotive - AECQ100

Automotive - General

SOIC(N)/16

61.9

-40 to +85

See All CCFL Controllers (13)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit: Typical Push-Pull Application

More Information

New Product Press Release

[ 2008-04-02 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 1; 2008-02-19
This page last modified: 2009-07-31