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UCSR3651S - HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

General Description

The UTC UCSR3651S is a primary control 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.
  • High Voltage startup circuit.
  • Built-in 650V Power MOSFET.
  • ±5% constant voltage regulation at universal AC input.
  • High precision constant current regulation at universal AC input.
  • Primary side control without TL431 and opto-coupler.
  • Programmable CV and CC regulation.
  • Programmable cable compensation in CV mode.
  • Flyback topology in DCM operation.
  • Frequency hopping to reduce system EMI.
  • Built-in leading edge blanking.
  • Built-in primary windin.

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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 UCSR3651S Preliminary HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH CMOS IC  DESCRIPTION The UTC UCSR3651S is a primary control switch mode charger and adapter applications. The controlled variable is transferred by an auxiliary winding from the secondary to the primary side. The device integrates PWM controller to enhance the performance of discontinuous conduction mode (DCM) flyback converters. The UTC UCSR3651S operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. It also provides off-time modulation to linearly decrease PWM frequency under light-load conditions so that low standby power can be achieved. The UTC UCSR3651S achieves high precision CV/CC regulation and high power efficiency.