Polyzen Protects Circuits Of USB-Port Devices

Tyco Electronics' Polyzen ZEN059V130A24LS device helps to provide complete circuit protection for electronics with USB ports and meets suspend-mode power-consumption requirements for USB 3.0. A major advantage of the USB 3.0 specification is the increased operating current it allows devices to consume (900 against 500mA in USB 2.0). As more and more mobile devices adopt the USB port as the primary charging interface, the need for higher charging current has increased and shorter charge time has become an important consideration.

Mobile devices are not always charging when connected to the USB port; in fact, they may spend the majority of time in either standby or suspend mode. A device's suspend-mode power-consumption characteristic can be a major circuit-protection design issue. A USB device designed to support suspend-mode operation is limited to 2.5mA average current draw. Any circuit-protection solution, CMOS or other, must operate within this boundary.

Polyzen devices are polymer-enhanced Zener diodes that help provide coordinated protection against damage caused by overvoltage, overcurrent and ESD transients in a single package. The Polyzen ZEN059V130A24LS device combines high power-absorption capabilities with low Vz (Zener voltage) and low power-consumption. Due to the device's polymer thermal-protection architecture, it can absorb high-energy pulses and effectively block overvoltage and reverse bias sources that could ultimately damage a stand-alone Zener diode. With a Vz below 6V, it helps to protect sensitive downstream electronics, and its low 5V power consumption meets USB 3.0 suspend-mode requirements.

For USB 3.0 devices, the Polyzen device can be placed on the USB input port, the Powered-B plug, and/or, where applicable, any supplementary power port. The Polyzen device offers designers the simplicity of a high-power clamping diode while obviating the need for significant heat sinking. Its embedded 'time delayed' overvoltage lockout and overcurrent switching help protect against the use of improper power supplies, reverse-bias sources and negative voltages, as well as damage caused by overcurrent conditions, ESD transients, inductive spikes and other overvoltage events.

It can also help manufacturers reduce warranty costs and improve the reliability of portable electronics such as: mobile phones and handhelds; personal navigation devices (PNDs); MP3 and CD players; DVD and Blu-Ray disc players; digital still cameras and video camcorders; USB 3.0 hubs and adapter cards; printers and scanners; solid-state devices (SSDs); external hard disk drives (HDDs) and mass storage devices; and laptop and desktop PCs.

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