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Data Sheet

FULL DATA SHEET (PDF, 484kB) Download   E-Mail

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 (300VRMS to 1400VRMS) 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.

Key Features		Applications/Uses
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)		LCD Monitors LCD TVs

Application Notes

Application Note 4135: Implementing Analog Dimming on the DS39xx CCFL Controllers - DS3991 Application Note 4190: Enhancing the Gate-Drive Capacity of the DS39xx CCFL Controllers - DS3991

Evaluation Kits

none

Design Guides

FLAT-PANEL DISPLAY (PDF)

Reliability Reports

Reliability Report: DS3991.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-4 of 4
DS3991	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS3991Z+T&R/PP			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3991Z+T&R/HB			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3991Z+PP			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS3991Z+HB			SOIC;16 pin;62 mm² Dwg: 56-G2008-001C (PDF) Use pkgcode/variation: S16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2008-04-02

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