Power Electronics / Power Management


Flyback regulator

8 February 2012 Power Electronics / Power Management

Linear Technology has released a high-reliability (MP grade) version of the LT3512, a high-voltage isolated monolithic flyback regulator that operates over a


-55°C to 150°C junction temperature range. The device simplifies the design of an isolated DC/DC converter and requires no optocoupler, third winding or signal transformer for feedback, as its output voltage is sensed from the primary-side flyback signal.

The LT3512 operates over a 4,5 V to 100 V input voltage range, has a 420 mA, 150 V power switch and delivers up to 4,5 W of output power, making it well suited for a wide variety of telecom, datacom, automotive, industrial and military applications. The IC operates in a boundary mode, current-mode control switching scheme, resulting in less than ±5% regulation over the full line, load and temperature range.

Boundary mode, also known as critical conduction mode (crcm), 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 numerous applications.



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