Texas Instruments has introduced fully integrated multiphase bidirectional DC/DC current controller, which efficiently transfers electric power greater than 500 W per phase between dual 48-V and 12-V 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.
Hybrid electric vehicles use both a high-voltage 48-V battery and the standard 12-V automotive battery. Design engineers typically manage these dual battery systems using a digital control scheme, which includes multiple discrete components such as current-sense amplifiers, gate drivers and protection circuits. These full digital control schemes are bulky and expensive.
To solve this challenge while improving performance and system reliability, TI offers a mixed architecture in which the microcontroller handles higher-level intelligent management, and the integrated LM5170-Q1 analog controller provides the power conversion.
Some of its features are:
- High accuracy: The controller’s 1 percent accurate bidirectional current regulation ensures precise power transfer.
- Power efficient: The LM5170-Q1 achieves greater than 97 percent efficiency.
- High precision: The controller monitors current with up to 99 percent accuracy.
- High power: Integrated 5-A peak half-bridge gate drivers for high power capability.
- Superior performance: Diode emulation mode of the synchronous rectifier MOSFETs prevents negative current and enhances light load efficiency.
- Automotive quality: The LM5170-Q1 is AEC-Q100 qualified.