Standalone active EMI filter ICs support high density power supply designs
Engineers can design smaller, lighter and more affordable power supplies while optimising system performance, efficiency and reliability, said Texas Instruments, at the launch of what is believed to be the industry’s first standalone active EMI filter IC. integrated circuits (ICs), enabling engineers to implement smaller, lighter EMI filters, to enhance system functionality at reduced system cost while simultaneously meeting EMI regulatory standards.
At Apec in Orlando, Florida this week, the company unveiled the family of active EMI filter ICs consisting of the TPSF12C1 and TPSF12C3 for single- and three-phase commercial applications and the TPSF12C1-Q1 and TPSF12C3-Q1 for automotive applications.
The standalone active EMI filter ICs can sense and cancel common-mode EMI by as much as 30dB at frequencies between 100kHz and 3.0MHz in single- and three-phase AC power systems. This capability enables designers to reduce the size of chokes by 50 per cent, compared to purely passive filter solutions, and meet stringent EMI requirements, said TI.
One of the main challenges when designing high-density switching regulators is how to implement a compact and efficient design of the EMI input filter. Through capacitive amplification, these active EMI filter ICs enable engineers to shrink the inductance value of common-mode chokes by as much as 80 per cent, helping to cost-effectively achieve improved mechanical reliability and increased power density.
The active EMI filter ICs can efficiently reduce the heat generated in a power supply EMI filter, which also extends filter capacitor lifetimes and increases system reliability.
They incorporate sensing, filtering, gain and injection stages. They are in a SOT-23 14-pin package, with integrated compensation and protection circuitry to further reduce the implementation complexity and minimise the number of external components.
The TPSF12C1, TPSF12C3, TPSF12C1-Q1, and TPSF12C3-Q1 help detect, process and reduce EMI in a broad range of AC/DC power supplies, on-board chargers, servers, UPS, enabling engineers to address EMI design challenges and meet CISPR 11, CISPR 32 and CISPR 25 EMI requirements.
TI’s active EMI filter ICs meet IEC 61000-4-5 surge immunity requirements, minimising the need for external protection components, such as transient voltage suppression (TVS) diodes.
Supporting tools include PSpice for TI simulation models and quick-start calculators and help designers select and implement the optimal components for a system.
Pre-production quantities of the automotive-grade TPSF12C1-Q1 and TPSF12C3-Q1 are available now in a 4.2 x 2.0mm SOT-23 14-pin package. The commercial-grade TPSF12C1 and TPSF12C3 will be available in preproduction quantities by the end of March 2023. The TPSF12C1QEVM and TPSF12C3QEVM evaluation modules are available now. TI expects all devices to be available in volume production in the second quarter of 2023, and plans to release additional stand-alone active EMI filter ICs later in 2023.
Texas Instruments is showcasing the newest additions to its power management portfolio with standalone, low EMI active filter designs featuring the TPSF12C1-Q1 at the 2023 Applied Power Electronics Conference (APEC) 19 to 23 March in Orlando, Florida, USA, booth number 916.
