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UC3879 - PHASE SHIFT RESONANT CONTROLLER

Description

The UC3879 controls a bridge power stage by phase shifting the switching of one half-bridge with respect to the other.

This allows constant frequency pulse width modulation in combination with resonant, zero-voltage switching for high efficiency performance.

Features

  • Programmable Output Turn On Delay; Zero Delay Available.
  • Compatible with Voltage Mode or Current Mode Topologies.
  • Practical Operation at Switching Frequencies to 300 kHz.
  • 10-MHz Error Amplifier.
  • Pin Programmable Undervoltage Lockout.
  • Low Startup Current.
  • 150 µA.
  • Soft Start Control.
  • Outputs Active Low During UVLO BLOCK.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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www.ti.com UC1879 UC2879 UC3879 SLUS230B – JUNE 1998 – REVISED JUNE 2007 PHASE SHIFT RESONANT CONTROLLER FEATURES • Programmable Output Turn On Delay; Zero Delay Available • Compatible with Voltage Mode or Current Mode Topologies • Practical Operation at Switching Frequencies to 300 kHz • 10-MHz Error Amplifier • Pin Programmable Undervoltage Lockout • Low Startup Current – 150 µA • Soft Start Control • Outputs Active Low During UVLO BLOCK DIAGRAM DESCRIPTION The UC3879 controls a bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse width modulation in combination with resonant, zero-voltage switching for high efficiency performance.
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