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Two-Channel, Push-Pull CCFL Controller

Provides Superior Lamp Current Balance Compared to Single-Channel Solutions

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Two-Channel, Push-Pull CCFL Controller Oct 19, 2006

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Key Features

  • Two-Channel CCFL Controller for Backlighting LCD Panels for PC Monitors and LCD-TVs
  • Minimal BOM Provides Low-Cost Inverter Solution
  • Per-Channel Lamp Fault Monitoring for Lamp-Open, Lamp Overcurrent, Failure to Strike, and Overvoltage Conditions
  • Accurate (±10%) On-Board Oscillator for Lamp Frequency (40kHz to 80kHz)
  • Accurate (±10%) On-Board Oscillator for DPWM Burst-Dimming Frequency (90Hz to 220Hz or 180Hz to 440Hz)
  • Device Supply Undervoltage Lockout
  • Inverter Supply Undervoltage Lockout
  • Burst-Dimming Soft-Start Minimizes Audible Transformer Noise
  • Strike Frequency Boost
  • 100% to < 10% Dimming Range
  • 4.5V to 5.5V Single-Supply Operation
  • -40°C to +85°C Temperature Range
  • 16-Pin SO Package (150 mils)

Applications/Uses

  • LCD PC Monitors
  • LCD-TVs

Description

The DS3992 is a low-cost, two-channel controller for cold-cathode fluorescent lamps (CCFLs) that are used to backlight liquid crystal displays (LCDs). The DS3992 can drive multiple CCFLs per channel, making it ideal for 4- and 6-lamp LCD PC monitor and TV applications.

The DS3992 uses a push-pull drive scheme to convert 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 drive scheme uses a minimal number of external components, which reduces component and assembly cost and makes the printed circuit board (PC board) design easy to implement. The push-pull drive scheme also provides an efficient DC-to-AC conversion and produces near-sinusoidal waveforms.

Simplified Block Diagram

DS3992: Typical Operating Circuit DS3992: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Two-Channel, Push-Pull CCFL Controller Oct 19, 2006

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 .