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UC3838 - PWM CONTROLLER

General Description

The UTC UC3838 provides a CCM switching mixed mode operation for better efficiency performance.

The operation mode stays at CCM at heavy load, and switch to power-saving mode at light load.

The UTC UC3838 is a high performance current mode PWM controller ideally suited for low standby power.

Key Features

  • S.
  • Proprietary frequency hopping for Improved EMI performance.
  • Cycle-by-cycle current limiting.
  • CCM Power-saving mode Switching Operation.
  • Fixed switch frequency 65kHz TYP.
  • Dynamic peak current limiting for constant output power.
  • Built-in synchronized slope compensation.
  • Gate output voltage clamped at 17V.
  • Adjustable DC output OVP/OTP.
  • OLP/VCC OVP/Internal OTP (automatic recovery).
  • Internal Soft Start.
  • OTP through a NTC (latch mode) www. uni.

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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 UC3838 Preliminary LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS  DESCRIPTION The UTC UC3838 provides a CCM switching mixed mode operation for better efficiency performance. The operation mode stays at CCM at heavy load, and switch to power-saving mode at light load. The UTC UC3838 is a high performance current mode PWM controller ideally suited for low standby power. Low VCC startup current make the power reliable on startup design and a large value resistor could be used in the startup circuit to minimize the standby power. At no load condition, the IC operates in power-saving mode for lower standby power, decreasing frequency for Higher conversion efficiency at light load condition.