SLVUCM2 January 2023 TPSF12C3-Q1
The TPSF12C3QEVM evaluation module (EVM) is specifically designed to conveniently evaluate the performance of the TPSF12C3-Q1 power-supply active filter IC. The solution helps to substantially reduce the total size of the common-mode (CM) electromagnetic interference (EMI) filter in three-phase AC power systems, either with or without a neutral connection.
The TPSF12C3-Q1 provides a very low impedance path for CM noise in the frequency range of interest for EMI measurement and helps to meet prescribed limits for international EMI standards, such as:
Enabling up to 25 dB of CM noise reduction at the lower end of specified frequency ranges (for example, 150 kHz to 3 MHz) significantly reduces the size, cost and weight of the common-mode filter implementation, specifically the common-mode chokes. The device senses the high-frequency noise on each power line using a set of sense capacitors and injects noise-canceling currents back into the power lines using an injection capacitor.
A header on the EVM provides connections to the sense and inject capacitors, which are high-voltage rated components located off-board at or near the passive filter solution. Also included on the EVM are connections for the bias power supply (VDD and GND), which is set between 8 V and 16 V, and a remote enable (EN) signal. The GND terminal of the EVM refers to the chassis or Earth ground of the system.
The damping and compensation component values included with this EVM can require modification, depending on the specifics of the EMI filter implementation and the target application. Refer to the TPSF12C3-Q1 Standalone Active EMI Filter for Common-mode Noise Mitigation in Three-Phase AC Automotive Power Systems data sheet and TPSF12C3-Q1 quickstart calculator for additional guidance pertaining to AEF circuit operation, passive component selection and expected EMI performance.