US1651中文资料PRIMARY-SIDE REGULATION PWM POWER SWITCH数据手册UTC规格书

描述 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. The UTC  US1651  operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. Itoperates in fixed frequency mode at large load conditions, frequency reduction mode at light/medium load and ‘Extended burst mode’ at No/light load conditions. So that low standby power can be achieved. The UTC  US1651  achieves high precision CV/CC regulationand high power efficiency. It offers comprehensive protection coverage with auto-recovery

特性 Features

including Cycle-by-cycle current limiting, VDD over voltage protection, VDD clamp, OTP, leading edge blanking, VDD under voltage lockout, etc.    FEATURES   Programmable CV and CC regulationPrimary-side sensing and regulation with No TL431 and opto-couplerMulti-mode operation for high efficiencyAdjustable constant current and output power settingPower on soft-start time (4ms)Frequency shuffling and adjustable gate drive greatly improving EMI”Extended burst mode control” for improved efficiency and minimum standby designBuilt-in leading edge blanking (LEB)VDD under voltage lockoutVDD over voltage shutdown and clampCycle-by-Cycle current limitingFail-safe protection for open loop fault conditionAuto-restart in over voltage condition