100V Isolated Monolithic Flyback Regulator

LinearTechnology Corp.'s LT3511,is ahigh voltage isolated monolithic flyback switching regulator that significantlysimplifies the design of an isolated dc/dc converter. No optocoupler, thirdwinding or signal transformer are required for feedback since the outputvoltage is sensed from the primary-side flyback signal. The LT3511 operatesover a 4.5 to 100V input voltage range, has a 240mA, 150V power switch anddelivers up to 2.5W of output power, making it well suited for a wide varietyof telecom, datacom, automotive, industrial and medical applications.

The LT3511 operates in a boundary mode, a current-mode control switchingscheme, resulting in +/-5 percent typical regulation over the full line, loadand temperature range. Boundary mode, also known as critical conduction mode orCCM, permits the use of a smaller transformer compared to equivalent continuousconduction mode designs. The output voltage is easily set by two externalresistors and the transformer turns ratio. The high level of integrationresults in a simple, clean, tightly regulated application solution to thetraditional challenge of isolated power delivery.

Additional features include an onboard low dropout regulator for IC power,under voltage lockout and output voltage temperature compensation.

The LT3511 is available in a small MSOP-16 package with 4 pins removed foradditional high voltage pin spacing. In addition to the extended and industrialversions that operate over a junction temperature range from -40 to 125C, ahigh temperature automotive grade is available that operates from -40 to 150C.Pricing starts at $2.95 each in 1000-piece quantities.

100V Isolated Monolithic Flyback Regulator