Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3837
Edited by the Electronicstalk Editorial Team on 22 September 2006
DC controller boosts dynamic response
Synchronous flyback DC/DC controller provides precision regulation and high efficiency for 10 to 60W isolated power supplies.
Linear Technology has introduced the LT3837, a synchronous flyback DC/DC controller with precision regulation and high efficiency for 10 to 60W isolated power supplies The controller IC has 9 to 36V input voltage operation and is ideal for industrial and instrumentation applications
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LT3837 is a current mode controller that regulates the output voltage based on sensing secondary voltage via transformer winding.
This allows for tight output voltage regulation without the use of an optoisolator, improving dynamic response and system reliability.
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 9 to 36V to an isolated output of 3.3V at 12A with up to 90% efficiency and with precise +/-1% regulation.
The LT3837 has a unique feedback amplifier that eliminates the need for an optoisolator by sampling a transformer winding voltage during flyback period and using this voltage to precisely regulate the output voltage.
This alleviates design time for trimming the power supply.
Furthermore, the elimination of the optoisolator improves the output transient response.
An adjustable primary gate delay eliminates multiple discrete components from the circuit and optimises MOSFET switching time and transformer selection.
To further simplify the design, the LT3837 allows its switching frequency to be adjusted from 50 to 250kHz with a capacitor.
The IC can also be synchronised to an external oscillator.
The LT3837 is rated for operation from -40 to +125C and is offered in a thermally enhanced 16-lead TSSOP package.
1000-piece pricing is set at $3.10 each. Request a free brochure from Linear Technology Corp ...
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