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USRB02 - HIGH PRECISION CC/CV PRIMARY SIDE SWITCH

General Description

The UTC USRB02 is a primary controller for charger and adapter applications.

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

Key Features

  • S.
  • ±5% constant voltage regulation at universal AC input.
  • Primary side control without TL431 and opto-coupler.
  • High precision constant current regulation at universal AC input.
  • Programmable CV and CC regulation.
  • Eliminates control loop compensation circuitry.
  • Flyback topology in DCM operation.
  • Random frequency modulation to reduce system EMI.
  • Built-in power NPN.
  • Multi-mode operation for efficiency improving.
  • Programmable cable drop compensation.

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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 USRB02 Preliminary LINEAR INTEGRATED CIRCUIT HIGH PRECISION CC/CV PRIMARY SIDE SWITCH  DESCRIPTION The UTC USRB02 is a primary controller for charger and adapter applications. The controlled variable is transferred by an auxiliary winding from the secondary to the primary side. The device operates in Pulse Frequency Modulation (PFM) in CC mode as well at large load condition and it operates in Pulse Width Modulation (PWM) with frequency reduction at light/medium load condition. The UTC USRB02 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 UTC USRB02 achieves high precision CV/CC regulation and high power efficiency.