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DS3992 - 2-Channel Push Pull CCFL Controller

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.

Features

  • o Two-Channel CCFL Controller for Backlighting LCD Panels for PC Monitors and LCD-TVs o Minimal BOM Provides Low-Cost Inverter Solution o Per-Channel Lamp Fault Monitoring for LampOpen, Lamp Overcurrent, Failure to Strike, and Overvoltage Conditions o Accurate (±10%) On-Board Oscillator for Lamp Frequency (40kHz to 80kHz) o Accurate (±10%) On-Board Oscillator for DPWM Burst-Dimming Frequency (90Hz to 220Hz or 180Hz to 440Hz) o Device Supply Undervoltage Lockout o Inverter Supply Undervoltage Loc.

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Full PDF Text Transcription

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www.DataSheet4U.com Rev 0; 9/06 Two-Channel, Push-Pull CCFL Controller General 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.
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