Wednesday, January 25, 2012

TI intros industry's first 100-V synchronous buck regulator with integrated MOSFETs

DALLAS, USA: Texas Instruments Inc. expanded its high-voltage point-of-load product line by introducing the industry's first 100-V synchronous buck regulator with integrated MOSFETs.

The 600-mA LM5017 is the first in a new family of step-down switching regulators that reduce PCB area and system cost while improving high-voltage reliability in telecommunication, industrial, smart grid and automotive systems. Used in conjunction with the award-winning WEBENCH online design tool, the LM5017 simplifies high-voltage DC/DC conversion and speeds the design process.

The 600-mA LM5017, together with the 300-mA LM5018 and 100-mA LM5019 available in April, enables direct point-of-load voltage regulation from input voltages as high as 100-V. This eliminates external transient voltage suppressors or clamps required to achieve reliable operation in high-voltage applications.

Integrated MOSFETs eliminate freewheeling Schottky diodes and improve efficiency. Pin-compatible 4-mm by 4-mm LLP packaging offers a scalable solution that covers a wide range of power requirements. Constant on-time (COT) control architecture provides excellent load transient response with no loop compensation required, further reducing the PCB area and simplifying the power supply design process.

The new switching regulators can also be used as isolated bias supplies for systems requiring small, efficient isolated power supplies. Unlike alternative flyback solutions, the LM5017 operates at switching frequencies up to 1-MHz, dramatically reducing the size and cost of the transformer.

For applications that require fixed frequency operation, TI's 100-V UCC25230 isolated bias supply switching converter supports up to 200-mA output current and uses a voltage mode control topology with input feed forward.

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