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.