LinkSwitch-TN 设计指南en.pdfVIP

Application Note AN-37 ® LinkSwitch-TN Family Design Guide Introduction • High effi ciency – full load effi ciencies 75% typical for 12 V LinkSwitch-TN combines a high voltage power MOSFET switch output with an ON/OFF controller in one device. It is completely self- • Excellent line and load regulation powered from the DRAIN pin, has a jittered switching frequency • High effi ciency at light load – ON/OFF control maintains high for low EMI and is fully fault protected. Auto-restart limits device effi ciency even at light load and circuit dissipation during overload and output short circuit • Extremely energy effi cient – input power 100 mW at no load (LNK304-306) while over temperature protection disables the • Entirely manufacturable in SMD internal MOSFET during thermal faults. The high thermal • More robust to drop test mechanical shock shutdown threshold is ideal for applications where the ambient • Fully fault protected (overload, short circuit and thermal faults) temperature is high while the large hysteresis protects the PCB • Scalable – LinkSwitch-TN family allows the same basic design and surrounding components from high average temperatures. to be used from 50 mA to 360 mA Scope LinkSwitch-TN is designed for any application where a non- isolated supply is required such as appliances (coffee machines, This application note is for engineers designing a non-isolated rice cookers, dishwashers, microwave ovens etc.), nightlights,