Isolated DC/DC Controller has Simple Design

Linear Technology has announced the LT3748H, a high input voltage isolated flyback DC/DC controller with guaranteed operation for junction temperatures as high as 150C. The LT3748H simplifies the design of an isolated DC/DC converter because there is no requirement for an opto-isolator, third winding or signal transformer for feedback, as the output voltage is sensed from the primary-side flyback signal. The LT3748 operates over a 5 to 100V input voltage range and drives an external N-channel power MOSFET, making it suitable for a wide variety of automotive, industrial, telecom and datacom applications.

The LT3748 operates in a boundary mode, current-mode control-switching scheme that results in +/-5 per cent typical regulation over the full line, load and temperature range. Boundary mode permits the use of a smaller transformer compared to equivalent continuous conduction mode designs. The output voltage is set by two external resistors and the transformer turns ratio. Several off-the-shelf transformers identified in the data sheet can be used for numerous applications.

According to Linear Technology, the high level of integration and use of boundary mode operation results in a simple, clean application solution to the traditional challenge of isolated power delivery. Additional features include an onboard low-drop regulator for IC power, programmable soft start, undervoltage lockout, adjustable current limit and output-voltage temperature compensation. The LT3748H is available in a small MSOP-16 package with four pins removed for additional high voltage pin spacing. The 1,000-piece price starts at USD3.71 each.

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