Vicor recommends a 4-layer PCB with a solid ground plane on the bottom layer, and a thermal relief pattern on the top layer to ensure good thermal conduction. A minimum of 2 oz copper thickness is recommended.
To ensure reliable start-up, Vicor recommends a soft-start circuit to limit the inrush current, and a minimum input capacitance of 10uF to ensure stable operation.
The maximum allowed input voltage ripple for the QPI-11LZ is 10% of the nominal input voltage. Exceeding this limit may affect the converter's reliability and performance.
The QPI-11LZ is rated for operation up to 100°C ambient temperature. However, derating may be necessary for high-temperature applications. Consult Vicor's application notes for guidance on thermal derating.
Vicor recommends using an oscilloscope to monitor the input and output voltages, and checking for proper pin connections and component values. Consult Vicor's troubleshooting guide for more detailed guidance.
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