Hybrid PPTC/MOV device
23 January 2013
Circuit & System Protection
TE Circuit Protection recently introduced the 2Pro AC, a hybrid device that offers designers an integrated, resettable approach to protect sensitive downstream electronics against damage from over-current and over-voltage events.
The part combines a PPTC (polymeric positive temperature coefficient) device and a thermally enhanced MOV (metal-oxide varistor) into one package. As a result, it is well suited to low-current applications such as LED lighting, smart meters, appliances and power supplies.
By integrating a resettable PPTC device with an MOV, the hybrid configuration of the 2Pro AC device offers benefits over typical approaches currently used in low-current applications to help prevent thermal runaway.
These include using an MOV with a fuse, which must be replaced when blown; placing the PPTC device and MOV next to each other on the board, which can lead to thermal instability and design complexity; or employing a thermal fuse integrated with an MOV, which is a one-use solution that trips without allowing resettability.
In contrast, the 2Pro AC device has thermally coupled components, is resettable, and provides stability by maintaining a varistor surface temperature of less than 150°C. It can help manufacturers meet industry requirements such as IEC61000-4-5 and IEC60950, and can help simplify UL60950 testing and compliance. It is also RoHS-compliant and halogen free.
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