Circuit & System Protection


EMI filter for DC-DC converters

2 May 2012 Circuit & System Protection

Vicor announced the introduction of the Picor QuietPower QPI-21 active EMI filter for DC-DC converters. Supporting 48 V DC-DC converter designs up to 14 A for data communications and telecommunication applications, the device provides >99,5% efficiency while achieving high filtering performance.

The QPI-21 is packaged in a high-density, 25 x 25 mm land grid array (LGA) surface mount package. Its 4,5 mm height maximises airflow for space constrained designs, making it an ideal fit for advanced blade-architecture applications. These density advantages are complemented by new performance enhancements enabling higher-frequency attenuation across various system configurations than earlier-generation QuietPower QPI-series filters.

The device attenuates conducted common mode (CM) and differential mode (DM) noise over the CISPR22 frequency range of 150 kHz to 30 MHz (45 dB for CM and 80 dB for DM attenuation at 250 kHz). It is designed for use in 48 V bus (36–76 V) systems, with 100 V d.c./100 ms 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 derating.

The QPI-21 supports the PICMG 3.0 specification for filtering system boards to the EN55022 Class B limits and is also tolerant to all DC-DC converter grounding schemes. It addresses multiple voltage rail/bus needs for applications in aerospace and industrial, in addition to datacom and telecom. The device is a universal filter for use with DC-DC converters from any manufacturer.





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