Power-supply filter ICs

Reduce system size, weight and cost with stand-alone AEF ICs

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Mitigating electromagnetic interference (EMI) has become more challenging given the large passive filters in power-supply systems. By acting as a capacitance amplifier, the active EMI filter (AEF) integrated circuits (ICs) in our power-supply filter IC portfolio make it possible to achieve up to 30 dB of additional EMI attenuation, reducing the inductance value of chokes in common-mode filters as much as 80%. AEF ICs make it possible to reduce the size, weight and cost of EMI filters in high-power-density solutions.

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Common-mode AEF ICs

AEF ICs sense the common-mode EMI voltage disturbances and inject noise-canceling current back into power lines, effectively amplifying the filter capacitance and enabling the use of smaller chokes. 

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Design & development resources

Calculation tool
TPSF12C1/-Q1 and TPSF12C3/-Q1 common-mode AEF quickstart calculator tool

Welcome to the TPSF12C1/-Q1 and TPSF12C3/-Q1 quickstart design tool. This standalone tool facilitates and assists the power-supply engineer with the design of an AEF circuit based on this family of common-mode AEF ICs.  As such, the user can expeditiously arrive at an optimized design to meet (...)
Evaluation board
TPSF12C3-Q1 three-phase active EMI filter evaluation board
The TPSF12C3-Q1 evaluation module (EVM) is designed to evaluate the performance of the TPSF12C3-Q1. The solution improves the common-mode (CM) electromagnetic interference (EMI) filter in three-phase AC power systems. The TPSF12C3-Q1 IC provides a low-impedance path for CM noise in the frequency (...)
Evaluation board
TPSF12C1-Q1 single-phase active EMI filter evaluation module
The TPSF12C1-Q1 evaluation module (EVM) is specifically designed to conveniently evaluate the performance of the TPSF12C1-Q1 active filter IC. The solution improves the common-mode (CM) electromagnetic interference (EMI) signature in single-phase AC and 3-wire DC power systems. The TPSF12C1-Q1 IC (...)

Benefits of power-supply filter ICs

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Meet stringent EMI standards

Our AEF ICs sense, process and mitigate EMI by as much as 30 dB, helping you meet Comité International Spécial des Perturbations Radioélectriques (CISPR) 11, CISPR 32 and CISPR 25 EMI requirements.

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Reduce filter size, weight and cost

Our AEF ICs enable designs with inductance values up to 80% lower, resulting in chokes that are half the size, lighter and more cost-effective.

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Extend capacitor life

By shrinking the size of large magnetics with our AEF ICs, you can reduce the amount of generated heat and improve system reliability.

Power trends

Mitigate EMI for increased performance

CISPR standards are the global benchmark for limiting EMI in electrical and electronic devices. Our highly integrated AEF ICs act as capacitive amplifiers, enabling you to significantly reduce emissions while maintaining the same filter size. Meet stringent EMI standards with greater margins using AEF ICs.

parametric-filter Find all power-supply filter ICs for low EMI
Featured products for low EMI
TPSF12C1-Q1 ACTIVE Automotive common-mode active EMI filter (AEF) for single-phase systems
TPSF12C3-Q1 ACTIVE Automotive common-mode active EMI filter (AEF) for three-phase systems

Reduce system size, weight and cost of passive EMI filter solutions and increase reliability

Touch-current safety regulations limit the size of Y-rated filter capacitors, resulting in large inductors. Our highly integrated AEF ICs enable you to significantly reduce magnetic components and overall filter size while maintaining a similar level of EMI. Ancillary benefits include lower power loss for better thermal management, improved system reliability, easier mechanical packaging design, and lower costs.

parametric-filter Find all power-supply filter ICs for power density
Featured products for power density
TPSF12C1-Q1 ACTIVE Automotive common-mode active EMI filter (AEF) for single-phase systems
TPSF12C3-Q1 ACTIVE Automotive common-mode active EMI filter (AEF) for three-phase systems

Technical resources

Application brief
Application brief
How a stand-alone active EMI filter IC shrinks common-mode filter size
Power density is a primary metric for applications in highly constrained system environments. Read this article to learn how you can reduce the volume of EMI filter components for a cost-effective, high-power-density solution.
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Video
Video
Get Started with AEF ICs to Mitigate Common-Mode EMI, Save Space and Reduce Costs
Learn how our portfolio of stand-alone AEF ICs for common-mode noise cancellation effectively reduces size, weight and cost in single- and three-phase systems compared to a traditional passive filter design.
Resource
Resource
How to Mitigate Common-Mode EMI and Increase Power Density in Single- and Three-Phase Systems
A compact and efficient design of the EMI input filter is a main challenge in high-density switching regulators. This paper reviews practical circuit realizations using AEF ICs for common-mode noise reduction in AC power systems.