9 Applications and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The TPSF12C3 common-mode AEF IC helps to improve the CM EMI signature of three-phase AC power

systems. The device 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 EMI standards, such as:

• CISPR 11, EN 55011 – Industrial, Scientific and Medical (ISM) applications

• CISPR 25, EN 55025 – Automotive applications

• CISPR 32, EN 55032 – Multimedia applications

To expedite and streamline the process of designing of a TPSF12C3-based solution, a comprehensive

TPSF12C3 quickstart calculator is available by download to assist the system designer with component selection

for a given application.

9.2 Typical Applications

For the circuit schematic, bill of materials, PCB layout files, and test results of a TPSF12C3-powered

implementation, see the TPSF12C3 EVM.

9.2.1 Design 1 – AEF Circuit for Grid Infrastructure Applications

Figure 9-1 shows a schematic diagram of a 10-kW high-density AC/DC regulator with conventional two-stage

passive EMI filter. The CM chokes and Y-capacitors provide CM filtering, whereas the leakage inductance of the

CM chokes and the X-capacitors provide DM filtering. Similar to TI reference designs TIDA-01606, the circuit

uses a three-phase power-factor correction (PFC) stage with SiC power MOSFETs.

The PFC stage runs at a fixed switching frequency of 100 kHz. Even though the use of GaN or SiC switches

enables a high power density, the conventional passive EMI filter typically occupies over 20% of the total solution

size.

C

X7

C

X8

C

X9

C

Y1

3-phase

AC/DC

regulator

C

X4

C

X5

C

X6

C

X1

C

X2

C

X3

3-phase

AC source

Chassis

C

Y5

C

Y6

C

Y7

C

Y8

C

Y2

C

Y4

L

CM2

L

CM1

C

Y3

Figure 9-1. Circuit Schematic of a Three-phase AC/DC Regulator With a Conventional Two-Stage EMI

Filter

The AC/DC stage increases the CM EMI signature based on the high dv/dt of the SiC power switches as well as

the various switch-node parasitic capacitances to chassis ground.

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TPSF12C3

SNVSCB8 – MARCH 2023

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