TDK shrinks CeraLink capacitors for power supply snubbers
TDK has shrunk the size of its CeraLink ceramic capacitors for snubber designs in power supplies.
Previously, only large, ready-to-fit sizes were available. Now, smaller versions measuring 5.7 x 5 x 1.4 mm (EIA 2220) is intended for 500V, and offers a capacitance of 250nF with very low parasitic coefficients.
CeraLink capacitors are based on PLZT ceramics (lead lanthanum zirconate titanate). In contrast to conventional ceramic capacitors, their maximum capacitance is at the operating voltage and increases as the proportion of the ripple voltage increases.
The B58043 range is available with both standard and soft termination. TDK will add further designs and voltage classes in the future.
At room temperature, the ESR at 1MHz is only 40mΩ, and the ESL is 3nH, with the values lower at higher temperatures. A high current capability of up to 9 ARMS is achieved at 200 kHz and 25 °C ambient temperature. The operating temperature range is -40 °C and +150 °C.
Typical applications use the smaller designs in either snubber or output capacitors, with the smaller size allowing them to be closer to switching power devise such as IGBT modules, SiC-based or GaN-based semiconductors. Alongside the low ESL values, the lead inductance is kept very low.
The technical guide offers more explanation on the properties of anti-ferroelectric capacitors.
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