Device Information - Texas Instruments TPSF12C1EVM-FILTER User Manual

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1.4 Device Information

CM filters for both commercial (Class A) and residential (Class B) environments typically have limited Y-
capacitance due to touch-current safety requirements and, thus require large-sized CM chokes to achieve the
requisite attenuation; ultimately resulting in filter designs with bulky, heavy and expensive passive components.
The deployment of active filter circuits enable more compact filters for next-generation power conversion
systems.
The EVM, a practical filter circuit realization for a single-phase power system, showcases the EMI performance
improvement or size reduction achievable with the TPSF12C1, a single-phase power-supply filter IC.
The circuit advantages summarize as:
1. Simple filter structure – with wide operating frequency range and high stability margins
2. Reduced CM choke size – for lower volume, weight and cost. This also enables much less copper loss and
better high-frequency performance due to lower choke self-parasitics and higher self-resonant frequency
3. No additional magnetic components – only uses Y-rated sense and inject capacitors with minimal impact to
peak touch current (measured according to IEC 60990)
4. Enhanced safety – using a low-voltage AEF IC referenced to chassis ground
5. Standalone AEF IC implementation – enables maximum flexibility in terms of placement near the filter
components
6. Surge immunity – robust to line voltage surges to meet IEC 61000-4-5 (with appropriate voltage clamping
internal or external to the IC).
The damping and compensation component values included with this EVM can require modification
if the passive filter components (the CM chokes in particular) are changed. Refer to the
Standalone Active EMI Filter for Common-mode Noise Mitigation in Single-Phase AC Automotive
Power Systems data sheet and
AEF circuit operation and loop gain, passive component selection and expected EMI performance.
SLVUCQ2A – JULY 2023 – REVISED JULY 2023
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Note
TPSF12C1 quickstart calculator
Active EMI Filter Evaluation Module for Single-Phase AC Power Systems
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for additional guidance pertaining to
CAUTION
Hot surface. Contact can cause burns. Do not touch.
CAUTION
High Voltage. Risk of electric shock.
Evaluation Module Overview
TPSF12C1
3