Tuesday, September 21, 2010

National Semiconductor's 65V dual-channel, dual-phase synchronous buck controller saves PCB space in high voltage apps

SANTA CLARA, USA: National Semiconductor Corp. has introduced the LM5119, a high voltage, dual-channel, dual-phase, synchronous buck controller with emulated current-mode (ECM) control.

The LM5119 enables regulation of single or dual high-current voltages directly from inputs as high as 65V, simplifying high voltage DC-DC conversion and reducing PCB footprint by up to 50 percent versus alternative solutions requiring two conversion stages.

The LM5119 features a unique combination of high performance, flexibility and ease-of-use for demanding telecommunication, automotive and industrial control applications that require accurate voltage regulation. The device expands National's portfolio of high voltage synchronous buck controllers to address higher load currents.

Today's telecommunication, automotive and industrial control applications must regulate low output voltages at increasing load currents from a high input voltage that can change widely while still meeting stringent PCB space and efficiency requirements.

Traditional approaches require two DC-DC conversion stages: one to regulate an intermediate bus voltage of approximately 9V to 12V and a second to regulate the specific load voltages that can be as low as 1V and can require currents in excess of 20 amperes.

National's LM5119 enables direct regulation of two output voltages from an input, eliminating the need for an intermediate bus conversion stage that limits efficiency and requires up to twice the number of components.

National's proprietary ECM control technology enables precise control of very small duty cycles necessary in high voltage applications, which allows accurate regulation of DC output voltages with excellent transient response. For high-current output requirements, the two outputs can be connected in parallel to power loads up to 40A with interleaved switching that minimizes input and output capacitance.

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