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Linear Tech SSPR synchronously drives MOSFETs at 500kHz

Posted: 09 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt3710? secondary side post regulator? single transistor sspr? magnetic amplifier post regulator?

The LT3710 secondary side post regulator (SSPR) from Linear Technology Corp. drives two external N-channel MOSFETs synchronously up to 500kHz switching frequency and allows the design of multiple output isolated power supplies with output currents from 1A to 20A and output voltages as low as 0.8V.

Positioned to replace single transistor SSPR or magnetic amplifier post regulators, the LT3710 is claimed by the company to deliver high power at high efficiency while using small-sized inductors and capacitors. Applications include telecom equipment, industrial power supplies as well as test and medical instrumentation.

The 16-lead TSSOP device incorporates a current mode architecture to control the output current. The 0.8V voltage reference has an accuracy of 1.5 percent and current mode operation provides improved line and load regulation.

The LT3710 also has user-adjustable current limit protection and soft start for reliable operation of digital ICs, which are powered by the power supply. The IC is synchronized to the falling edge of the transformer secondary winding and can be used in both single-ended and double-ended isolated power converter topologies.

A high-speed operational amplifier is also incorporated to achieve optimum compensation and fast transient response.

Multiple LT3710s can be stacked to provide multiple output isolated power supplies, which in conjunction with the company's primary side ICs, offer a lower cost solution compared with dc/dc brick modules.

The LT3710 is rated for operation from -400C to 850C and is priced starting at $3.95 each in 1,000-piece quantities.

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