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UC1108 - LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

General Description

The UTC UC1108 is a primary control unit for switch mode charger and adapter applications.

The controlled variable is transferred by an auxiliary winding from the secondary to the primary side.

Key Features

  • S.
  • 30mW No-load Input Power.
  • Primary side control for eliminating opto-coupler and secondary CV/CC control circuitry.
  • Proprietary CC tightening technique to achieve vertical CC profile.
  • Programmable output cable voltage drop compensation.
  • Compensation for external component temperature variations.
  • Random frequency adjustment to reduce system EMI.
  • Flyback topology in DCM operation.
  • Built-in soft start.
  • Over voltage protection.
  • Short circuit prote.

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Other Datasheets by Unisonic Technologies

Part Number Description
UC1100 LOW-POWER HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR
UC1103 HIGH PRECISION CC/CV PRIMARY SIDE SWITCHING REGULATOR

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 UC1108 Preliminary LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER  DESCRIPTION The UTC UC1108 is a primary control unit for switch mode charger and adapter applications. The controlled variable is transferred by an auxiliary winding from the secondary to the primary side. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The UTC UC1108 operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. It also eliminates the need of loop compensation circuitry while maintaining stability. The UC1108 achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 30mW.