Texas Instruments TPSF12C1QEVM User Manual page 6

Hardware
C
Y1
C
Y2
Figure 2-3. Filter Component and EVM Placement Example
2.2.3 Low-Voltage Testing
Figure 2-4 shows a schematic for low-voltage testing of the active filter design, including insertion loss
measurement and EMI performance characterization. This facilitates an easy and convenient verification of the
active filter circuit prior to connection to a high-voltage switching regulator. A good signal source and coupling
capacitor provide CM excitation that mimics the CM noise source voltage and noise source impedance related to
the switch-node behavior of an actual power stage.
AC Mains
L
Dual
LISN
GND
N
C
Y1
LISNs bonded
to the reference
ground plane
for EMI
measurement
Chassis (PE)
6 Active EMI Filter Evaluation Module for Single-Phase AC Power Systems
C
X1
L
CM1
C
SEN2
J2
L
CM1
C
X1
C C
SEN2 SEN1
C
Y2
680 pF
680 pF
Chassis
(PE)
S2 S1 INJ VDD
J1
C
U1
VDD
NC IGND
VDD INJ
TPSF12C1
NC NC
SENSE1A COMP2
SENSE1B
COMP1
SENSE2A
REFGND
SENSE2B
EN
TI standalone active EMI filter EVM
Figure 2-4. EVM Setup Schematic for Low-Voltage Testing
Copyright © 2023 Texas Instruments Incorporated
C
X2
L
CM2
C
SEN1
C
INJ
L
CM2
C C
X2 X3
C
INJ
4.7 nF
To enable the IC, leave EN open or
connect it to VDD using a jumper
EN
C
R
D3
D3
C
R D1
D1A
R
D1
D
1
C
D2
C
G1
C
R
G2
D2
R
G
SLVUCK7A – NOVEMBER 2022 – REVISED JULY 2023
www.ti.com
C
Y3
C
X3
C
Y4
L'
N'
C
SRC
1 nF
C
C
Y3
Y4
Square-wave
CM excitation source
5 V pk-pk, 100 kHz
22% duty cycle
Chassis (PE)
Chassis-referred VDD bias supply = 12 V
= Dual LISN for EMI measurement
= EVM
= Single-phase AEF IC
= Y-rated sense and inject capacitors
= 6-pin header
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