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News

Small Package Monolithic Flyback Regulator


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Linear Technology
: 25 February, 2011  (New Product)
Linear Technology is now enabling simplified design for isolated DC/DC converters with a high voltage isolated monolithic flyback regulator
Linear Technology announces the LT3512, a high voltage isolated monolithic flyback regulator that significantly simplifies the design of an isolated DC/DC converter. No optocoupler, third winding or signal transformer is required for feedback since the output voltage is sensed from the primary-side flyback signal. The LT3512 operates over a 4.5V to 100V input voltage range, has a 420mA, 150V power switch and delivers up to 4.5 watts of output power, making it well suited for a wide variety of telecom, datacom, automotive, industrial and medical applications.

The LT3512 operates in a boundary mode, a current-mode control switching scheme, resulting in better than +/-5% regulation over the full line, load and temperature range. Boundary mode, also known as critical conduction mode, 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 transformers identified in the data sheet can be used for a variety of applications. The high level of integration results in a simple, clean, tightly regulated application solution to the traditional challenge of isolated power delivery.

The LT3512 is available in a small MSOP-16 package with 4 pins removed for additional high voltage pin spacing. In addition to the extended and industrial versions that operate over a junction temperature range from -40C to 125C, a high temperature automotive grade is available that operates from -40C to 150C. Pricing starts at $3.15 each in 1000-piece quantities.
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