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US1651 Datasheet Primary-side Regulation Pwm Power Switch

Manufacturer: Unisonic Technologies

Overview: UNISONIC TECHNOLOGIES CO., LTD US1651 Preliminary PRIMARY-SIDE REGULATION PWM POWER SWITCH CMOS IC.

General Description

The UTC US1651 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.

Key Features

  • r>.
  • Programmable CV and CC regulation.
  • Primary-side sensing and regulation with No TL431 and opto-coupler.
  • Multi-mode operation for high efficiency.
  • Adjustable constant current and output power setting.
  • Power on soft-start time (4ms).
  • Frequency shuffling and adjustable gate drive greatly improving EMI.
  • ”Extended burst mode control” for improved efficiency and minimum standby design.
  • Built-in leading edge blanking (LEB).
  • VDD under voltage lockout.
  • VDD.

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