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Low-Cost CCFL Controller

Full-Featured Single-Channel CCFL Controller

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Low-Cost CCFL Controller Feb 19, 2008

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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

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.

Simplified Block Diagram

DS3991: Typical Operating Circuit: Typical Push-Pull Application DS3991: Typical Operating Circuit: Typical Push-Pull Application Zoom icon

Technical Docs

Data Sheet Low-Cost CCFL Controller Feb 19, 2008

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .