SLVAFJ9 March 2023 TPSF12C1 , TPSF12C1-Q1 , TPSF12C3 , TPSF12C3-Q1
Common-mode (CM) EMI filters for high-density applications often have a limit to the total value of Y-capacitance – related to touch-current safety requirements – and thus require large-sized CM chokes to achieve a target corner frequency or filter attenuation characteristic. The result is a compromised passive filter design with bulky, heavy and expensive CM chokes that dominate the overall filter size.
However, active EMI filter (AEF) circuits enable more compact filter designs for next-generation power management systems. As such, space-constrained applications can use active power-supply filter integrated circuits (ICs) to reduce magnetic component and overall filter size. Ancillary benefits include lower power losses for better thermal management and higher reliabilty, easier mechanical and packaging designs, reduced electromagnetic coupling among components within a confined space, and lower cost.