New Industry Products

65-V Synchronous Step-Down Converter with Fly-Buck Capability

March 04, 2015 by Jeff Shepard

Texas Instruments, Inc. (TI) today introduced a 65-V synchronous step-down converter that provides isolated bias supplies up to 15 W – without the need for an opto-coupler. As part of TI's Fly-Buck power portfolio, the LM5160A improves power density and addresses higher power needs more efficiently and reliably in industrial and automotive applications, such as three-phase ac motor drives, programmable logic controllers (PLCs), smart metering, renewable energy or grid infrastructure, factory automation, power over Ethernet (POE) IP cameras and electric vehicles.

The LM5160A converter features a constant on-time control that requires no loop compensation and supports high step-down ratios with fast transient response. The converter, which supports a wide-input voltage of 4.5 V to 65 V, can generate positive and negative bias-supply rails in non-isolated designs, or single and multiple isolated outputs, while minimizing solution size and simplifying the design compared to traditional flyback solutions.

Key features and benefits of the LM5160A: The 4.5- to 65-V input voltage range allows the converter to efficiently operate in harsh transient conditions without the need for input clamp circuits, resulting in higher reliability. Constant on-time control provides fast transient response and results in lower component count. Programmable soft start reduces in-rush currents when powering up into heavy loads or large capacitance. Internal ±1 percent voltage reference and VOUT error correction improve accuracy across line, load and temperature. The LM5160A is available now in volume production and priced at US$1.80 in 1,000-unit quantities.