Kemet's high-voltage bulk capacitors save board space

摘要

The Kemet Power Solutions (KPS) high-voltage stacked capacitors in X7R dielectric employ a proprietary lead-frame technology that vertically stacks one or two MLCCs in a single surface-mount package. The two-chip vertically stacked device offers up to double the capacitance of a single capacitor in the same or smaller footprint, saving board space in a design. KPS series devices, which are available in rated voltages of 500V dc and 630V dc and an operating temperature range of-55℃ to +125℃, provide board flex capability up to 10 mm. The lead frame isolates the capacitors from the PCB to provide better mechanical and thermal stress performance and to address concerns about audible microphonic noise that may occur when a bias voltage is applied. The devices are avail- able in commer- cial and automotive grades and are suited to applications such as switching-power-supply smoothing circuits, snub-bers in lighting ballast circuits, and high-voltage coupling/dc blocking in inverters.