
Cissoid Unveils Vesuvio Buck Converters
Cissoid has launched its Vesuvio technology, which implements buck (step-down) DC-DC converters operating with high efficiency from -55C to +225C. Based on Cissoid’s two-chip set Magma-Hyperion and power transistors, the Vesuvio technology includes a reference design and a demonstration board. Vesuvio can step input voltages from 6V to 30V down to an output voltage adjustable from 1.2V up to 90 per cent of the input.
Vesuvio buck converters demonstrate efficiencies in excess of 90 per cent above 200C. When configured as synchronous DC-DC converter, it operates in continuous current mode (CCM) at a constant frequency, making ripple filtering easier for demanding sensor applications. Vesuvio technology uses the soft-start capability of Magma PWM controller to enable a smooth start-up.
The input voltage feed forward compensation makes it very robust to input voltage transient variations and provides a DC line regulation better than +/-1.5mV/V. The demonstration board is adjusted to a 5V output and is able to deliver up to 10W at 225C. The board is rated to 175C but can be tested higher for short periods of time. It is ideally shaped for test purposes with thermo-streamers.
Besides this example, Vesuvio technology can be used to build DC-DC buck converters with output voltages up to 27V delivering up to 50W. The reference design and its bill of material can be mapped onto high-temperature substrates and assembled in high reliability modules. Vesuvio technology is available for licensing and includes the reference design and its schematic, a demonstration board, data sheet and application note, as well as the bill of material.







