750105

The 750105 is an design kit for LT3574, an isolated monolithic flyback switching regulator that significantly simplifies the design of a low power isolated DC to DC converter. No opto isolator, third winding or signal transformer is required for feedback since the output voltage is sensed from the primary side flyback signal. The LT3574 operates in boundary mode, which is a variable frequency current mode control switching scheme, resulting in ±5% 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 output voltage is easily set by two external resistors and the transformers turns ratio. Several off the shelf transformers identified in the data sheet can be used for numerous applications. The high level of integration and use of boundary mode operation results in a simple clean application solution to the traditionally tough problem of isolated power delivery.

• Input voltage range from 3V to 40V
• Onboard 0.65A, 60V integrated NPN power switch
• No transformer, third winding or opto isolator required for feedback
• Current mode control
• Programmable soft start
• Off the shelf transformers
• Programmable under voltage lockout
• Output voltage temperature compensation
• Adjustable current limit
• Boundary mode operation

Applications

Industrial, Automotive, Communications & Networking, Medical, Power Management