Bi-directional Converter Interconnects 48V And 12V Rails In HEVs


As automakers strive to meet increasingly stringent CO2 emissions requirements, there is a move toward hybrid electric vehicles, which use both a secondary high-voltage 48V battery in addition to the standard 12V automotive battery. For these dual battery systems, Texas Instruments has introduced a multiphase bidirectional DC/DC current controller which is said to efficiently transfer electric power greater than 500 W per phase between dual 48V and 12V automotive battery systems.

The highly integrated LM5170-Q1 analog controller features an innovative average current-mode control method that overcomes the challenges of today’s high-component-count, full digital control schemes.

TI notes that the conventional full digital control scheme used to manage the dual battery systems includes multiple discrete components such as current-sense amplifiers, gate drivers and protection circuits, which makes this scheme bulky and expensive.

To solve this challenge, TI’s new solution features a mixed architecture which involves a microcontroller to handle higher-level intelligent management, and the highly integrated LM5170-Q1 analog controller which provides the power conversion.

The LM5170-Q1 is AEC-Q100 qualified and available in volume now in a 48-pin, 9 x 9mm quad flat package (QFP). It is priced at US$5.84 in 1,000-unit quantities.

TI plans to demonstrate the LM5170-Q1 controller in booth No. 701 at the Applied Power Electronics Conference (APEC) in Tampa, Florida, March 27-29, 2017.

For further details, view the full Press release.

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