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Switching regulators offer 95% efficiency at full load

Posted: 09 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:switching regulators? high efficiency? automotive? aerospace electronics?

Murata Power Solutions, formerly known as C&D's Power Electronic division, has introduced the 78SR series of 2A switching regulators. These devices provide high operating efficiency for applications requiring 3.3V or 5V outputs at 2A or less, from 8V to 32V inputs. At a nominal 12V input, full-load efficiencies approach 96 percent for 5V models, and 93 percent for 3.3V models.

Unlike competitive products which typically suffer efficiency drops at low load currents, 78SR switching regulators operating at 12Vin and 25 percent load (0.5A) deliver efficiencies of 90 percent for 5V models, and 87 percent for 3.3V models, said Murata.

The 78SR series offers a 210KHz switching frequency, optimized low-loss layout, and an open frame construction. This allows for full-load operation from 9V, 12V or 24V supplies at ambient temperatures up to 70C without heat sinks, forced air cooling or temperature derating. This high efficiency can dramatically increase battery life in portable instrumentation and standby-power applications, while also providing lower overall operating costs, said Murata.

The switching regulators offer several additional improvements over linear counterparts. These include higher operating input voltage (32V vs. 28V), higher output current (2A vs. 1.5A) and tighter output accuracy (2 percent vs. 5 percent). Line and load regulation of 0.35 percent and 0.25 percent, respectively, allows for operation from poorly-regulated DC supplies. They do not need any external input or output capacitors to provide stable, low-noise operation.

The 78SR switching regulators are low cost, pin and function compatible upgrades for competitive 0.5A to 2A output linear or switch-mode 3-pin modules. Applications include battery-powered instruments, test equipment and fixtures, 12 V/24 V automotive, marine and recreational vehicles, military and aerospace electronics, industrial control instrumentation and battery back-up power systems.

The devices are available in two 0.8 x 0.85-inches (20.3mm x 21.6mm) package styles: a standard vertical-mount SIP which occupies less than 0.09-inch?. (58mm?) of PCB real estate, and for applications with height restrictions, a horizontal-mount version with an installed height of less than 0.30-inches (7.6 mm).

Pricing starts from $13.95 in single piece quantity and under $7 in high volume quantities. Lead times are from stock to 12 weeks. Free sample/evaluation units for qualified OEMs are immediately available from stock.

- Gina Roos

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