Monday, May 20, 2024

Synchronous Buck Converter Reference Design For Automotive 

Designed to meet the demanding requirements of modern automotive electronics, this high-efficiency converter ensures stable power delivery to various automotive loads, from infotainment systems to advanced driver-assistance systems (ADAS). 

The Synchronous Buck Converter for Automotive Applications represents a critical advancement in power supply technology, specifically tailored to meet the demanding requirements of automotive electronics. As vehicles continue to integrate more sophisticated electrical systems, the need for efficient, reliable, and compact power converters has become paramount. This addresses these needs by offering a high-efficiency solution capable of delivering stable power to various automotive loads. From infotainment systems and advanced driver-assistance systems (ADAS) to lighting and motor control, this synchronous buck converter design ensures optimal performance, reliability, and electromagnetic compatibility (EMC) in the challenging automotive environment.

The 100W synchronous buck converter reference design, featuring the LM5146-Q1 integrated circuit, is specifically designed to power automotive loads efficiently and reliably. Operating at a fixed frequency of 250 kHz, this converter ensures low noise operation critical for automotive applications. Several key features have been incorporated into the design to enhance its performance and meet automotive standards. An input filter is integrated to prevent reflected ripple, minimising conducted emissions. Additionally, an RC snubber is included to attenuate noise in the RF band, reducing radiated emissions and further enhancing electromagnetic compatibility (EMC).

One of the most impressive features of this design is its ability to handle surge voltages up to 36Vpk, making it a robust and reliable choice for the demanding automotive environment. Efficiency is a key factor in any power converter, and this design shines with efficiency levels surpassing 95% over a wide output current range of 5A to 20A, at a 14V input voltage. This high efficiency not only minimizes power loss but also aids in thermal management, ensuring the converter operates within safe temperature limits.

Another standout feature is the tight load regulation, which results in a low deviation of only 5mV in the output voltage over the entire range of input voltages. This guarantees stable and reliable power delivery to the connected loads. The design offers flexibility in synchronization. It can either synchronize other converters through its output or be externally synchronized through its input, providing versatility in system design and integration. This 100W synchronous buck converter reference design is a robust, efficient, and versatile solution for automotive power supply needs. Its high efficiency, low noise operation, and EMC features make it an ideal choice for powering a wide range of automotive loads, ensuring reliable performance in demanding environments.

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TI has tested this reference design, which comes with a bill of materials (BOM), schematics, and other data. The company’s website has additional data about the reference design. To read more about this reference design, click here.

Akanksha Gaur
Akanksha Gaur
Akanksha Sondhi Gaur is a journalist at EFY. She has a German patent and brings a robust blend of 7 years of industrial & academic prowess to the table. Passionate about electronics, she has penned numerous research papers showcasing her expertise and keen insight.

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