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GENERAL DESCRIPTION

TE Circuit Protection PolyZen devices are polymer enhanced, precision Zener diode micro-assemblies. They offer resettable protection against multi-Watt fault events without the need for multi-Watt heat sinks.

The Zener diode used for voltage clamping in a PolyZen micro-assembly was selected due to its relatively flat voltage vs current response. This helps improve output voltage clamping, even when input voltage is high and diode currents are large.

An advanced feature of the PolyZen micro-assembly is that the Zener diode is thermally coupled to a resistively non-linear, polymer PTC (positive temperature coefficient) layer. This PTC layer is fully integrated into the device, and is electrically in series between VIN and the diode clamped VOUT.

FEATURES

? Overvoltage transient suppression

? Stable VZ vs fault current

? Time delayed, overvoltage trip

? Time delayed, reverse bias trip

? Multi-Watt power handling capability

? Integrated device construction

? RoHS Compliant

BENEFITS

? Stable Zener diode helps shield downstream

electronics from overvoltage and reverse bias

? Trip events shut out overvoltage and reverse bias

sources

? Analog nature of trip events minimizes upstream

inductive spikes

? Minimal power dissipation requirements

? Single component placement

TARGET APPLICATIONS

? DC power port protection in portable electronics

? DC power port protection for systems using

barrel jacks for power input

? Internal overvoltage & transient suppression

? DC output voltage regulation

? Tablet PCs and portable electronics