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Switching regulator speeds DC/DC converter design

Posted: 05 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:flyback? switching regulator? DC/DC? converter?


Linear Technology Corp. introduces an isolated monolithic flyback switching regulator that significantly simplifies the design of an isolated DC/DC converter. Output voltage is sensed from the primary-side flyback signal, thus there is no need for an opto-isolator, third winding or signal transformer. The LT3575 operates over a 3V to 40V input voltage range, has a 2.5A power switch and delivers up to 14W of output power, making it well suited for a wide variety of industrial, medical, telecom, datacom and automotive applications.

The LT3575 operates in boundary mode, which is a variable frequency current-mode control switching scheme, typically resulting in 5 percent 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, identified in the data sheet, 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 dropout regulator for IC power, programmable soft-start, undervoltage lockout, adjustable current limit and output voltage temperature compensation.

The LT3575 is available in a small thermally enhanced TSSOP-16 package and is offered in an extended and industrial operating junction temperature range from -40C to 125C. Pricing starts at $3.50 each in 1,000-piece quantities.

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