Active EMI filtering for DC-DC converters
The QuietPower QPI-21 is packaged in a high density, 25x25mm Land Grid Array (LGA) surface mount package that reduces PCB board area consumed by EMI filtering, ensuring ultra-efficient board utilization. The filter’s 4.5mm height maximizes airflow for space constrained designs, making it suitable for advanced blade-architecture applications. The QuietPower QPI‐21 attenuates conducted common mode (CM) and differential mode (DM) noise over the CISPR22 frequency range of 150 kHz to 30 MHz (45dB for CM and 80dB for DM attenuation at 250 KHz). 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 to +125°C and up to an ambient temperature of 65°C without de‐rating. 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. The QuietPower QPI-21 is available in two package types: the QPI-21LZ (lidded LGA package) and the QPI-21LZ-01 (open frame LGA package).
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