Knowles stacks ceramic capacitors for power supply filtering
Vertically stacked ceramic capacitor models have been added to the capacitor assembly portfolio by Knowles Precision Devices. The company says they improve performance in a smaller footprint.
The SV series of capacitor assemblies for power supply filtering applications are vertically stacked ceramic capacitors and are claimed to offer superior performance compared with aluminium or tantalum electrolytic capacitors. They also help to reduce the overall circuit board footprint.
“The assemblies can be made with up to 10 chips of the same size with various lead configurations to safeguard against thermal and mechanical stresses,” explained Dan Callen, product manager, Knowles Precision Devices. He added that the SV series is 100 per cent tested for dielectric withstanding voltage, insulation resistance, capacitance and dissipation factor.
The SV series is suitable for the input and output stages of switch mode power supplies and DC/DC converters. SV series capacitor assemblies are available in the X7R dielectric with a high capacitance-to-volume ratio. Low equivalent series resistance (ESR) and low equivalent series inductance (ESL) are inherent in the SV series design, continues Knowles, which gives the assemblies the capability to handle high ripple currents at high frequencies. Ripple current can cause self-heating (I2R) losses and degradation in a capacitor, reducing ESR helps minimise these impacts, to reduce power loss and improve reliability.
Knowles Precision Devices designs capacitor assemblies with its patented Cap-Rack technology. The Cap-Rack capacitor assemblies bond chips of the same size using a high temperature epoxy, resulting in a chip that has high capacitance in a small footprint.
Knowles Precision Devices manufactures specialty components, capacitors and microwave products for use in critical applications in 5G, medical, military and electric vehicle market segments.