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Power/Alternative Energy??

New flyback controller needs no optoisolator

Posted: 17 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:LT3837? DC/DC controller? optoisolator? Linear Technology?

Linear Technology Corp. introduced 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 suitable for industrial and instrumentation applications. The product is a current mode controller that regulates the output voltage based on sensing secondary voltage via transformer winding. Synchronous rectification increases conversion efficiency and is said to improve 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 percent efficiency and with precise 1 percent regulation.

The LT3837 has a feedback amplifier that eliminates the need for an optoisolator by sampling a transformer winding voltage during flyback period and using this voltage to regulate the output voltage. According to Linear, the elimination of the optoisolator improves the output transient response. The LT3837 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 -40C to 125C and is offered in a thermally-enhanced 16-lead TSSOP package. 1,000-piece pricing is set at $3.10 each.




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Related Datasheets
Part Number Description Category
? LT3837 Isolated No-Opto Synchronous Flyback Controller ICs, Interface

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