Standalone Active EMI Filter IC for High-Density Power Supply Designs
Texas Instruments (TI) introduces the industry's first self-contained active electromagnetic interference (EMI) filter integrated circuit (IC), which can help engineers implement smaller and lighter EMI filters, thereby enhancing the system at a lower system cost features while meeting EMI regulatory standards.
As electrical systems become denser and interconnected, mitigating EMI becomes a key system design consideration for engineers. A new family of stand-alone active EMI filter ICs can detect and eliminate up to 30dB of Common Mode EMI (Frequency Range 100kHz to 3MHz). This feature enables designers to reduce the size of the choke by 50% compared to pure passive filter solutions and meet stringent EMI requirements.
"To meet customer demand for higher performance and lower cost systems, Texas Instruments continues to drive innovation in power supplies that cost-effectively address EMI design challenges," said Carsten Oppitz, general manager of Texas Instruments' switching regulator business unit. We believe that the new portfolio of stand-alone active EMI filter ICs will further empower engineers to solve their design challenges and significantly improve performance and power density in automotive, enterprise, aerospace and industrial applications."
Significantly reduces system size, weight and cost, and improves reliability
How to implement a compact and efficient EMI input filter design is one of the main challenges when designing high-density switching regulators. Through capacitive amplification, these new active EMI filter ICs enable engineers to reduce the inductance value of common mode chokes by up to 80%, which will help improve mechanical reliability and power density in a cost-effective manner.
The new family of active EMI filter ICs includes the TPSF12C1 and TPSF12C3 for single-phase and three-phase commercial applications, and the TPSF12C1-Q1 and TPSF12C3-Q1 for automotive applications. These devices effectively reduce heat generated in power supply EMI filters, extending filter capacitor life and improving system reliability.
New active EMI filter ICs include sensing, filtering, gain, injection stages. The IC is housed in a SOT-23 14-pin package and integrates compensation and protection circuitry, further reducing implementation complexity and external component count.
Mitigates common-mode emissions to meet stringent EMI standards
The International Special Committee on Radio Interference (CISPR) standards are the global reference for limiting EMI in electrical and electronic equipment. The TPSF12C1, TPSF12C3, TPSF12C1-Q1, and TPSF12C3-Q1 help detect, process, and reduce EMI in various AC/DC power supplies, on-board chargers, servers, UPS, and other similar systems where common-mode noise dominates. Engineers will be able to meet EMI design challenges and meet CISPR 11, CISPR 32 and CISPR 25 EMI requirements.
Texas Instruments' active EMI filter ICs meet IEC 61000-4-5 surge immunity requirements, which significantly reduces the need for external protection components such as transient voltage suppression (TVS) diodes. With supporting tools such as PSpice® for TI simulation models and quick-start calculators, designers can easily select and implement the appropriate components for their systems.
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