X-capacitor discharge ICs meet IEC safety regulations

November 07, 2013 // By Graham Prophet
Power Integrations' CAPZero automatic X-capacitor discharge IC is now certified to meet IEC CTL DSH 1080, the new mandatory addition to the Certification Body (CB) scheme of the IEC60950 and IEC60065 standards governing X-capacitor discharge safety regulations.

CAPZero ICs are simple, SO-8-packaged, two-terminal devices that require only the addition of discharge resistors to automatically implement the X-capacitor discharge function. New power supplies must comply immediately with the IEC CTL DSH 1080 requirement, which ensures that a power supply’s X-capacitor safety-discharge function remains operational over the life of the product. CB-certified X-capacitor discharge devices such as CAPZero pass a stringent safety-testing protocol including a lengthy period of high-temperature and high-humidity testing and high voltage line-surge testing. Power supplies using a certified X-capacitor discharge device are deemed automatically compliant. Power supplies not using a CB-certified device, including those using discrete components or other non-certified ICs, must pass the same environmental tests as well as line-surge testing with all protection devices such as varistors and bulk capacitors removed. Any redesign would result in a need for re-certification of the power supply. CAPZero devices can be positioned before or after the system input fuse and are suitable for a wide variety of power supply applications.

The CB certificate, Nemko certificate, and Nemko test report for the CAPZero ICs, plus full supporting documentation are available at http://www.powerint.com/en/products/capzero-family/capzero