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US3651 - HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH

Datasheet Summary

Description

The UTC US3651 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.

Features

  • S.
  • Built-in 600V 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 winding inductance compensation.
  • Pow.

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Datasheet preview – US3651

Datasheet Details

Part number US3651
Manufacturer Unisonic Technologies
File Size 199.74 KB
Description HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
Datasheet download datasheet US3651 Datasheet
Additional preview pages of the US3651 datasheet.

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Full PDF Text Transcription

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UNISONIC TECHNOLOGIES CO., LTD US3651 Preliminary HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH CMOS IC  DESCRIPTION The UTC US3651 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 US3651 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 US3651 achieves high precision CV/CC regulation and high power efficiency.
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