Are you referring to the so-called "combination wave" generator that has an open circuit voltage waveform of 1.2x50 uS and a short circuit waveform of 8x20 uS?
It was my impression that most TVS devices are specified for this waveform, but few are specified for the longer waveforms such as 10x1000 uS that can show up on long cables.
If the 24 VDC line you are trying to protect is a power supply rail, you won't be able to use the high-current-handling SCR type devices such as sidactors because there will be a latch up problem with the DC current once the device triggers. You will be stuck with devices such as zener diodes or MOVs. The zener diodes have limited surge capability and MOVs have a wear-out characteristic, so each technology has its limitations.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
[email protected]
http://www.randolph-telecom.com
Hi folks,-
I'm trying to determine the maximum current that a TVS can cope with for the EN 61000-4-5 pulse. Very few data sheets provide this and calculating it is not possible because device construction enters the equation.
Does anyone have any data on TVS current ability during the surge?
The TVS is being installed on a 24 DC line.
Thanks,
Derek.
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