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Subject: Re: Pulse Transformer
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Date: 07/01/02 at 5:49 AM
Posted by: David Ashby
In Reply to: Pulse Transformer posted by ads on 06/28/02 at 10:12 AM:
I think there is not enough information in your question for anyone to suggest the best approach. To create a 70V signal of the same waveshape and frequency as the original 4V would normally just need an amplifier with a fairly high voltage output stage; this will be smaller and lighter than a transformer. If electrical isolation between input and output is needed, you might be able to design your solution around an opto-coupler.
If the 4V signal is your only source of power from which you have to create the 70V signal, then that will either involve a transformer or switching inverter. Since the frequency is quite low, the transformer could be quite bulky, depending on how much power you need to transfer. A DC/DC converter would be smaller. To create -70V from 4V, you would need to use either an inverting or flyback topology. Companies like Maxim, Linear Technology, Micrel publish lots of design examples - just look around for something that is the closest fit to what you require. Since the 4V signal is pulsing on/off, you might need to use a DC/DC converter I.C. that has an ON/OFF input, so that you can shut down the inverter during the off phase of the 4V signal.
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