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Linear Technology introduces the LT3837, a synchronous flyback DC/DC controller for 10W to 60W isolated power supplies. The controller IC has 9V to 36V input voltage operation and is ideal for industrial and instrumentation applications. The LT3837 is a current mode controller that regulates the output voltage based on sensing secondary voltage via transformer winding. Synchronous rectification increases conversion efficiency and improves output cross regulation in multiple output power supplies. For example, the LT3837 is used to convert an input supply of 9V to 36V to an isolated output of 3.3V at 12A with up to 90% efficiency and with precise ±1% regulation. The chip allows its switching frequency to be adjusted from 50kHz to 250kHz with a capacitor. The IC can also be synchronized to an external oscillator.

The LT3837 is rated for operation from -40°C to 125°C and is offered in a thermally enhanced 16-lead TSSOP package. 1,000-piece pricing is set at $3.10 each.