SNVSCB8A march 2023 – april 2023 TPSF12C3
PRODUCTION DATA
The TPSF12C3 is an active electromagnetic interference (EMI) filter that is designed to reduce common-mode (CM) conducted emissions in off-line power converter systems. Using a VSCI architecture, the device senses the high-frequency noise on each power line using a set of Y-rated capacitors, CSEN1-4, then injects noise-canceling currents back into the power lines using a Y-rated capacitor, CINJ, along with a damping circuit that ensures stability. The device includes integrated filtering, compensation and protection circuitry.
The TPSF12C3 provides a low-impedance shunt path for CM noise in the frequency range of interest for EMI measurement. This feature can achieve approximately 15 to 30 dB of CM attenuation over the applicable frequency range (for example, 100 kHz to 3 MHz) helping to reduce the size of CM chokes, typically the largest components in the filter.
The TPSF12C3 operates over a supply voltage range of 8 V to 16 V and can withstand 18 V. The device features include:
The active EMI filter circuit significantly reduces EMI filter cost, size, and weight, while helping to meet CISPR 11 and CISPR 32 Class B limits for conducted emissions. Leveraging a pin arrangement designed for simple layout that requires relatively few external components, the TPSF12C3 is specified for maximum ambient and junction temperatures of 105°C and 150°C, respectively.