Power Integrations continues energy-saving X capacitor IC series

Power Integrations has announced a further development in its energy-saving X capacitor discharge IC, the CapZero-3 X-Capacitor discharge IC. The two-terminal CapZero-3 ICs enable designers to meet IEC60335 safety approvals for major appliances, and cover all capacitor values from 100 nanoFarad to 6 micro Farad.

IEC60335 is the discharge safety standard for all appliances. To protect the user from an electrical hazard, it requires the voltage across the input X capacitor to discharge to less than 34V within less than one second after the AC is removed. CapZero-3 ICs block current flow through the X-capacitor discharge resistors when the AC voltage is connected, and automatically discharge X capacitors through those resistors when the AC is disconnected. CapZero-3 ICs simplify EMI filter designs while permitting the use of larger X capacitors, which in turn enables smaller inductive components to be used with no resulting change in power consumption.

CapZero-3 ICs can be placed before or after a system’s input fuse. Devices deliver high common-mode surge immunity so that no external ground connection is necessary and feature a high differential surge withstand due to 1,000V internal MOSFETs. Creepage on the package and PCB is maintained at above 4.0mm.

Designers can use one part to address a large range of applications in small and major appliances that require X capacitor values from 100 nano Farad to 6 micro Farad.

CapZero-3 devices are safety-certified to CB and Nemko requirements. Developers do not need to perform a separate safety test on the X-capacitor discharge circuit of the power supply.


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