SM72485

SM72485 SolarMagic 100V, 150 mA Constant On-Time Buck Switching Regulator May 10, 2011 SM72485 SolarMagic 100V, 150 mA Constant On-Time Buck Switching Regulator General Description The SM72485 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100 V N-Channel Buck Switch. The device is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 package. The regulator is based on a control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme requires no loop compensation. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC under-voltage lockout, Gate drive under-voltage lockout, Max Duty Cycle limiter, and a pre-charge switch. ■ Operating frequency remains constant with varying line ■ ■ ■ ■ ■ ■ voltage and load current Adjustable output voltage from 2.5V Highly efficient operation Precision internal reference Low bias current Intelligent current limit Thermal shutdown Typical Applications ■ ■ ■ ■ PV Panel Smart Junction Boxes Non-Isolated Telecommunication Buck Regulator Secondary High Voltage Post Regulator +42V Automotive Systems Features ■ ■ ■ ■ ■ ■ ■ Renewable Energy G...