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UC3883 - PWM CONTROLLER

General Description

UTC UC3883 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications.

PWM switching frequency at normal operation is internally fixed and is trimmed to tight range.

Key Features

  • r>.
  • Power on Soft Start Reducing MOSFET VDS Stress.
  • Frequency shuffling for EMI.
  • Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design.
  • Ultra Low Operating Current at Light Load (typical 0.6mA).
  • Audio Noise Free Operation.
  • Normal 65KHz Switching Frequency.
  • Frequency Triple for peak load (180KHz).
  • Adjustable Overload Protection (OLP) delay time.
  • Comprehensive Protection Coverage VCC Under Voltage Lockout with Hysteresis (UVLO).

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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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UNISONIC TECHNOLOGIES CO., LTD UC3883 Preliminary HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER WITH PEAK LOAD  DESCRIPTION UTC UC3883 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. PWM switching frequency at normal operation is internally fixed and is trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. VCC low startup current and low operating current contribute to a reliable power on startup and low standby design with UTC UC3883.