USR1652中文资料PRIMARY-SIDE REGULATION PWM POWER SWITCH数据手册UTC规格书

描述 Description

The UTC USR1652 is a primary control switch mode chargerand adapter applications. The controlled variable is transferred byan auxiliary winding from the secondary to the primary side. Thedevice integrates PWM controller to enhance the performance ofdiscontinuous conduction mode (DCM) flyback converters.The UTC USR1652 operates in primary-side sensing andregulation. Opto-coupler and TL431 could be eliminated. Itoperates in fixed frequency mode at large load conditions,frequency reduction mode at light/medium load and ‘Extendedburst mode’ at No/light load conditions. So that low standby powercan be achieved.The UTC USR1652 achieves high precision CV/CC regulationand high power efficiency. It offers comprehensive protectioncoverage with auto-recovery

特性 Features

including Cycle-by-cyclecurrent limiting, VDD over voltage protection, VDD clamp, OTP,leading edge blanking, VDD under voltage lockout, etc. FEATURES  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 over voltage shutdown and clamp Cycle-by-Cycle current limiting Fail-safe protection for open loop fault condition Auto-restart in over voltage condition