Linear Technology‘s just-introduced LT3748 is a high input voltage isolated flyback DC/DC controller that does not require an opto-isolator, third winding or signal transformer for feedback since the output voltage is sensed from the primary-side flyback signal.
The part operates over a 5V to 100V input voltage range and drives an external N-channel power MOSFET, making it suitable for a wide variety of industrial, medical, telecom, datacom and automotive applications.
The LT3748 operates in boundary mode, which is a variable frequency current mode control switching scheme, resulting in +/-5% typical regulation over the full line, load and temperature range. Boundary mode also permits the use of a smaller transformer compared to equivalent continuous conduction mode designs.
The LT3748 is available in an MSOP-16 package with 4 pins removed for additional high voltage pin spacing. This device is available in extended and industrial operating junction temperature range at -40°C to 125°C. Pricing starts at $3.12 each in 1000-piece quantities.