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UC1108 - 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.

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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Datasheet preview – UC1108

Datasheet Details

Part number UC1108
Manufacturer Unisonic Technologies Co., Ltd
File Size 243.01 KB
Description LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
Datasheet download datasheet UC1108 Datasheet
Additional preview pages of the UC1108 datasheet.

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Full PDF Text Transcription

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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.
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