High density zero-voltage-switching DC/DC converter modules

May 15, 2013 // By Graham Prophet
Vicor has added to its Picor isolated Cool-Power ZVS DC-DC converter modules with high power density (334 W/in3) units; paired with Picor QuietPower active EMI filters they fit space-constrained industrial and aerospace/defence applications

The ultra high density Picor Cool-Power PI31xx series of isolated, ZVS-based DC-DC converters is optimised for 24-V industrial, 28-V aerospace/defence and/or demanding wide temperature applications. The Cool-Power PI31xx converters retain the product series’ 0.87 x 0.65 x 0.265 in. surface-mount package profile to provide up to 334 W/in 3 power density and 2.25 kV input to output isolation. At less than 50% the size of a conventional isolated 1/16th brick, Cool-Power PI31xx converters provide exceptional performance in an IC package for use in high density system designs.

Cool-Power PI31xx series converters use an advanced Zero-Voltage Switching (ZVS) architecture and high-performance planar magnetics to enable IC-like density and greater PCB layout flexibility in space-constrained environments. The high-switching frequency (900 kHz) of PI31xx series converters reduces input filter and output capacitance requirements, further reducing space constraints. Programmable features include output voltage trimming, programmable soft-start capability, and remote on/off ENABLE. There is also a temperature monitor function, providing an analogue output voltage proportional to the internal module temperature.

The PI31xx is self-protected against fault conditions including: input over-voltage, under-voltage lockout, over-temperature, and output over-voltage protection. A constant current limit threshold is employed to protect against short circuit and overload conditions. All fault conditions have an auto-restart function.

When paired with 0.98 x 0.49 x 0.18 in. Picor QuietPower EMI filters – the smallest filters in this product category at less than 25% the size of competing offerings – designers are afforded an end-to-end isolated DC-DC conversion and EMI filtering solution that’s unrivaled in density optimisation. QuietPower filters provide up to 99.5% efficiency and are designed for universal compatibility with high frequency switching DC-DC converters from any manufacturer. Example products include the QuietPower QPI-12 filter with high common-mode (>40dB) and high differential-mode (>70dB) attenuation for industrial applications. For aerospace/defence applications, the MQPI-18 offers >45dB and >75dB common-mode and differential-mode attenuation respectively.

Vicor, www.vicorpower.com