USR3654A中文资料HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH数据手册UTC规格书

描述 Description

The UTC USR3654A 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 USR3654A operates in primary-side sensing andregulation. Opto-coupler and TL431 could be eliminated. It alsoprovides off-time modulation to linearly decrease PWM frequencyunder light-load conditions so that low standby power can beachieved.The UTC USR3654A achieves high precision CV/CC regulationand high power efficiency. It offers comprehensive protectioncoverage with auto-recovery

特性 Features

including Cycle-by-cyclecurrent limiting, V DD over voltage protection, V DD clamp, OTP,leading edge blanking, V DD under voltage lockout, etc.  FEATURES  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 winding inductance compensation Power on soft start Gate Output Maximum Voltage Clamped at 15V Cycle-by-cycle current limiting Over voltage protection V DD under-voltage lockout