Texas Instruments has developed the TPSF12C3-Q1 and TPSF12C1-Q1 active filter ICs to address the challenge of common-mode electromagnetic interference (EMI) in single-phase AC automotive power systems. These devices are engineered to provide an effective solution for mitigating EMI, offering numerous advantages over conventional passive filter designs.
The AEF is equipped with voltage sense and current inject (VSCI) using a capacitive multiplier circuit to replicate the behavior of Y-capacitors in a passive filter. By sensing high-frequency noise on each power line and injecting noise-canceling currents back into the lines, these ICs effectively reduce common-mode EMI. The active capacitance is determined by the circuit gain and injection capacitance, allowing for precise control and optimization.
One of the key benefits of these AEF ICs is their use of relatively low capacitance values, resulting in small component footprints. Furthermore, they integrate filtering, compensation, and protection circuitry, as well as an enable input, streamlining the implementation process. By enabling up to 30 dB of CM noise reduction in specified frequency ranges, these devices can significantly minimize the size, weight, and cost of CM filter implementation, offering a compelling value proposition for automotive applications.
In summary, Texas Instruments' TPSF12C3-Q1 and TPSF12C1-Q1 active filter ICs represent a sophisticated and efficient solution for addressing common-mode EMI in single-phase AC automotive power systems. By leveraging advanced VSCI technology and providing significant noise reduction benefits, these devices have the potential to enhance the performance and reliability of automotive electronics while optimizing design and manufacturing costs.
Functional safety-capable: documentation is available to aid in the functional safety system design
Wide supply voltage range: 8 V to 16 V
Junction temperature range: -40°C to +150°C
Package: 4.2 mm x 2 mm SOT-23 14-pin DYY
AEC-Q100 qualified for automotive applications:
Ambient operating temperature range Grade 1: -40°C to +125°C
Voltage-sense current-inject active EMI filter
Optimized for CISPR 25 Class 5 automotive EMI requirements
Low impedance for common-mode emissions
50%+ reduction in choke size, weight, and cost
Peak inject current: ±80 mA (typ.)
Simple configuration for three-phase AC systems:
Integrated sensing filter and summing network
Low leakage current at line frequency
Simplified compensation network
Inherent protection features for robust design:
Withstands surge of 6 kV (IEC 61000-4-5) with minimal external component count
Enable pin for remote ON and OFF control
VDD voltage UVLO protection with hysteresis
Thermal shutdown protection with hysteresis
Onboard chargers for BEVs and PHEVs
Automotive isolated DC/DC regulators
HVAC motor controls, aerospace, and defense
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