1 Features
• AEC-Q100 qualified for automotive applications:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• 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 of ±80 mA (typical)
• Wide supply voltage range of 8 V to 16 V
• –40°C to 150°C junction temperature range
• Simple configuration for single-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 5-kV surge (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
• 4.2-mm × 2-mm SOT-23 14-pin (DYY) package

2 Applications
• On-board charger and isolated DC/DC for EVs
• Isolated DC/DC for servers, AC/DC for telecom
• Inverters and HVAC motor control

3 Description
The TPSF12C1-Q1 is an active filter IC designed
to reduce common-mode (CM) electromagnetic
interference (EMI) in single-phase AC power systems.
The active EMI filter (AEF) configured with voltage
sense and current inject (VSCI) uses a capacitive
multiplier circuit to emulate the Y-capacitors in a
conventional passive filter design. 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. The effective active capacitance is set by
the circuit gain and the injection capacitance. The
AEF sensing and injection impedances use relatively
low capacitance values with small component
footprints. The device includes integrated filtering,
compensation and protection circuitry, and an enable
input.
The TPSF12C1-Q1 provides a very low impedance
path for CM noise in the frequency range of interest
for EMI measurement. 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, weight and cost of the
CM filter implementation.