Controller available in a military MP temperature grade

18th March 2015

Siobhan O'Gorman

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Datasheet

The LT3748, a high input voltage isolated flyback DC/DC controller developed by Linear Technology, is now available in a military MP grade version. This device simplifies the design of an isolated DC/DC converter by not requiring an opto-isolator, third winding or signal transformer for feedback since the output voltage is sensed from the primary-side flyback signal.

The DC/DC controller operates over a 5-100V input voltage range and drives an external N-channel power MOSFET, making it well suited for a wide variety of automotive, industrial, telecomms and datacomms 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 output voltage is easily set by two external resistors and the transformer turns ratio. Several off-the-shelf transformers are identified in the data sheet that can be used for numerous applications. The high level of integration and the use of boundary mode operation results in a simple, clean application solution to the traditionally tough problem 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 LT3748MP operating junction temperature is from -55 to +150°C and the device is housed in a MSOP-16 package with four pins removed for additional high voltage pin spacing. The 1,000-piece price starts at $9.25 each.