US3651A数据手册UTC中文资料规格书

描述 Description

The UTC US3651A 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 US3651A 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 US3651A achieves high precision CV/CC regulation and high power efficiency. It offers comprehensive protection coverage with auto-recovery

特性 Features

including Cycle-by-cycle
·current limiting, V DD  over voltage protection, V DD clamp, OTP,
·leading edge blanking, V DD  under voltage lockout, etc.
 
·    FEATURES
 
· Built-in 650V Power MOSFET
· (-5% ,+15%) 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