New CAPZero-3 X-capacitor discharge ICs from Power Integrations meet IEC60335

20 August 2019

CAPZero-3 Application
CAPZero-3 Application

New device family is backward compatible and reduces standby power for appliance applications.

Power Integrations, experts in high-voltage integrated circuits for energy-efficient power conversion, today announced CAPZero™-3, the latest generation of the company’s elegant, energy-saving X-capacitor discharge ICs. Two-terminal CAPZero-3 ICs enable designers to easily meet IEC60335 safety approvals for major appliances, and cover all capacitor values from 100 nF to 6 µF.

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 34 V 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 1000 V internal MOSFETs. Creepage on the package and PCB is maintained at >4 mm.

Edward Ong, Product Manager at Power Integrations commented: “With the launch of the new CAPZero-3 ICs, designers can use one part to address a large range of applications in small and major appliances that require X-capacitor values from 100 nF to 6 µF.”

CAPZero-3 devices are safety-certified to CB and Nemko requirements and so developers do not need to perform a separate safety test on the X-capacitor discharge circuit of the power supply. Devices are available now, priced at $0.31 in 1,000 piece quantities. Technical support is available from the Power Integrations website at: www.power.com/products/capzero-3


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