Half bridge control ICs for LCD backlighting applications

Our high voltage ICs are ideal for driving both CCFLs (Cold Cathode Fluorescent Lamps) and EEFLs (External Electrode Fluorescent Lamps) for backlighting applications. They can drive a half bridge circuit made up of two N-MOSFETs with a supply voltage of up to 550 V, so the inverter can be supplied directly from a 400 V PFC bus.


Key features and benefits

  • Adjustable maximum fault timing
  • High efficiency thanks to resonant topology
  • Integrated level shifters, bootstrap diodes and PWM generator
  • Master / slave configuration for simpler system configuration
  • Integrated protections
  • Cost effective system / BoM reduction
  • Hard-switching control
  • Low EMI
  • Brightness level control through PWM switching
  • No hard switching

Key applications

  • LCD backlighting

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Descriptive summary

The devices contain controller, level shifter, bootstrap diode and drivers for external half bridge power switches. There is also a low frequency PWM generator for controlling the brightness level of the lamps, using an analog brightness / dimming control voltage. PWM dimming can also be realized using a digital PWM input signal. PWM dimming can be synchronized with other ICs. The lamp current is controlled by means of a true zero voltage switching resonant control principle, ensuring lowest possible switch losses in the half bridge power structure. Capable of driving and controlling a half bridge inverter with resonant load circuit for CCFLs, the ICs can also drive an array of EEFLs.

Products

Type numberDescriptionStatusQuick access
UBA2071ATHalf bridge control IC for CCFL backlighting Download datasheet
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