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UC3837L - LOW COST POWER-SAVING MODE PWM CONTROLLER

General Description

The UTC UC3837L is a high performance current mode PWM controller ideally suited for low standby power.

Low VDD 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.

Key Features

  • S.
  • UTC proprietary frequency hopping technology for Improved EMI performance.
  • Power-saving mode for high light-load and standby efficiency.
  • Soft Start.
  • Dynamic peak current limiting for constant output power.
  • Built-in synchronized slope compensation.
  • OLP with automatic recovery.
  • OTP and OVP ( in UTC UC3837L with latch shut down).
  • VDD clamp for higher security.
  • Programming BNO/Line OVP for higher security.
  • Fixed switch frequency 65kHz.
  • Gat.

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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 UC3837L CMOS IC LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVEBNOERS  DESCRIPTION The UTC UC3837L is a high performance current mode PWM controller ideally suited for low standby power. Low VDD 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. The UTC UC3837L contains protection with automatic recovery including OLP (over load protection), OCP (cycle-by-cycle current limiting), and UVLO (VDD over voltage clamp and under voltage lockout).