Data and telecoms EMI filter for DC-DC converts
Published: 20 March 2012 - Michelle Winny
A high-density active EMI filter for DC-DC converters has been released by Vicor Corp. The company's QuietPower device supports 48V DC-DC converter designs up to 14A for data and telecommunication applications. The QPI-21 input filter is claimed to provide more than 99.5 percent efficiency.
The device is packaged in a high-density, 25 by 25mm Land Grid Array (LGA) surface mount package that can reduce PCB board area consumed by EMI filtering, potentially ensuring ultra efficient board utilisation.
The filter's 4.5mm height maximises airflow for space-constrained designs, which is good for advanced blade-architecture applications.
The density advantages are assisted by new performance enhancements enabling higher frequency attenuation across various system configurations.
The device attenuates conducted common mode (CM) and differential mode (DM) noise over the CISPR22 frequency range of 150kHz to 30MHz (45dB for CM and 80dB for DM attenuation at 250KHz).
The filter is designed for use in 48V bus (36 - 76V) systems, with 100VDC/100ms surge capability, and operates over a wide temperature range of -40°C to 125°C and up to an ambient temperature of 65°C without any derating.
The converters support the PICMG 3.0 specification for filtering system boards to the EN55022 Class B limits.