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Designers can use TI’s new step-down controller to optimize the size and EMI of power supplies in industrial and automotive electronics

Dallas, April 7, 2021/PRNewswire/ - Texas Instruments (TI) (NASDAQ: TXN) today introduced a series of new synchronous DC/DC step-down controllers that enable engineers to shrink power supplies The size of the solution and reduce its electromagnetic interference (EMI). LM25149-Q1 and LM25149 use integrated active EMI filter (AEF) and dual random spread spectrum (DRSS) technology, enabling engineers to reduce the area of ​​external EMI filters by half and reduce the conducted EMI of power supply designs by up to 55 dBµV, or a combination of reduced filter size and low EMI. For more information, please visit www.ti.com/LM25149-Q1-pr and www.ti.com/LM25149-pr.

Reducing EMI in power supplies is an increasingly severe design challenge, especially with the increase in electronic content in advanced driver assistance systems (ADAS), automotive infotainment and clusters, building automation, and aerospace and defense designs. Traditional methods to ensure that designs meet conducted EMI specifications include increasing the size of external passive EMI filters, which in turn will increase the size of the overall power solution. By integrating AEF, the LM25149-Q1 and LM25149 step-down controllers enable engineers to meet EMI standards while increasing the power density of their designs. To understand how the integrated AEF works, please read the technical article "How to use integrated active EMI filters to reduce EMI and power supply size."

Reduce the conducted EMI of the entire CISPR 25 category 5 spectrum

The most stringent industry requirement for low EMI design is the Comité International Spécial des Perturbations Radioélectriques (CISPR) 25 Class 5 automotive EMI specification. The LM25149-Q1 and LM25149 step-down controllers help engineers meet these requirements by reducing conducted EMI across multiple frequency bands. The integrated AEF helps detect and reduce conducted EMI in the low frequency range from 150 kHz to 10 MHz, enabling engineers to attenuate EMI up to 50 dBµV at a switching frequency of 440 kHz (compared to a design with AEF disabled), or with a typical The design of the passive filter compares up to 20 dBµV. In these two design schemes, DRSS technology helps to reduce an additional 5 dBµV of EMI in the low and high frequency bands.

In order to further reduce EMI, both step-down controllers have a frequency synchronization function with an external clock, helping engineers to reduce unwanted beat frequencies in EMI-sensitive applications. To learn more about EMI suppression technology, please read the white paper "Time-saving and cost-effective innovation for EMI reduction in power supplies."

Minimize the external EMI filter while minimizing the cost of the solution

Maintaining low EMI in the power supply and achieving a smaller solution size is often inconsistent in the design of switching power supplies. The LM25149-Q1 and LM25149 step-down controllers enable engineers to meet challenging EMI standards and reduce solution size by reducing the area and volume of passive EMI filters. Compared with competing solutions, engineers can save nearly 50% of the front-end EMI filter area and more than 75% of the volume at 440 kHz. By reducing the filtering burden of passive components, integrated AEF reduces their size, volume and cost, enabling engineers to achieve the smallest possible low EMI power supply design.

The LM25149-Q1 and LM25149 controllers further increase the power density by implementing interleaved two-phase operation and integrating bootstrap diodes, loop compensation and output voltage feedback components, thereby reducing design complexity and cost. Engineers can also choose to use external feedback and loop compensation to further optimize their designs.

Pre-production quantities of the 42V LM25149-Q1 and LM25149 are available now, only available on TI.com, in a 3.5mm x 5.5mm thermally enhanced 24-pin very thin quad flat no-lead (VQFN) package. Units of 1,000 Bulk purchases start at US$1.42 and US$1.20. The LM25149-Q1EVM-2100 evaluation module can be purchased on TI.com for $75. There are multiple payment and shipping options on TI.com. TI expects both devices to be mass-produced in the fourth quarter of 2021. In addition, TI is also committed to the development of pin-to-pin compatible 80V versions of these two devices.

Texas Instruments (NASDAQ: TXN) is a global semiconductor company that designs, manufactures, tests, and sells analog and embedded processing chips for the industrial, automotive, personal electronics, communications equipment, and enterprise systems markets. Our enthusiasm for making electronic products more affordable through semiconductors to create a better world still exists today, because each generation of innovation is built on the basis of the last generation, making our technology smaller, more efficient, more reliable and more affordable—— Make it possible for semiconductors to enter ubiquitous electronic products. We think this is engineering progress. This is what we have done and have been doing for decades. Learn more on TI.com.

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