New low voltage output ripple attenuator

1 June 2005 Power Electronics / Power Management

Vicor subsidiary, Picor, has introduced the QPO-2 System-in-a-Package (SiP), an output ripple attenuator that uses active filtering to reduce supply output ripple and noise (PARD, periodic and random deviation) by over 30 dB from 1 kHz to 500 kHz. The QPO-2 architecture improves transient response and ensures quiet point-of-load regulation when used with most switching power supplies.

According to the company, QPO-2 is easy to apply and provides the user with features that can be tailored to optimise the product's performance to meet their system needs. It is targeted to applications such as telecom base stations and handheld power, distributed point-of-load power systems, sensors requiring low-noise power, and medical instrumentation.

The QPO-2 operates over an output voltage range of 0,3 to 5,5 V d.c. and requires an external input bias voltage above the output voltage of 7 V for proper operation. It is compatible with most switching power supplies and converters and regulates the load by using either the remote sensing feature of a converter or the adjust pin of the QPO-2. The adjust feature will correct the converter's output voltage to compensate for the headroom voltage drop of the filter if remote sensing is not available or not preferred. The headroom setting of the filter dramatically reduces the capacitance needed at the point of load to provide the equivalent transient performance and ripple reduction.

The SiP measures 25 x 25 x 4,5 mm with LGA mounting.

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