X-Capacitor rapid discharge IC reduces standby power for appliances

August 23, 2019 //By Nick Flaherty
X-Capacitor discharge chip from Power Integrations slashes standby power
The two-terminal CAPZero-3 discharge chip meets IEC60335 safety approvals and covers all capacitor values from 100 nF to 6 µF.

Power Integrations has launched its third generation of energy-saving X-capacitor discharge ICs.

The two-terminal CAPZero-3 chip allows 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. The discharge chip blocks the 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. This can 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.

THe CAPZero-3 discharge chip 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.

“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,” said Edward Ong, product manager at Power Integrations.

THe 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 www.power.com/products/capzero-3.

 


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