SDAA139 October 2025 UCC33020 , UCC33020-Q1 , UCC33410 , UCC33410-Q1 , UCC33411-Q1 , UCC33420 , UCC33420-Q1 , UCC33421-Q1
UCC33xxx-Q1 passes CISPR32, class B with several dBμV of margin due to proper EMI filter selection and carefully applied PCB layout techniques. For CE, the burst frequency magnitudes were mitigated due to proper selection of EMI filter components used to design a pi filter at the primary side. An RC damping network was designed and selected to dampen the DM inductance resonant effect of the LISNs. For RE, ground planes were used to connect the ground pins of the device to improve the switching loop performance and the pins were spread over the available footprint of the system for H field mitigation. The 0402 15nF capacitors were selected to provide low impedance at the switching frequency.