Magnetic amp used in DI-148

Hi,

Thanks for contacting PI. Are you planning to use PeakSwitch from PI?

Unfortunately the PeakSwitch IS NOW OBSOLETE. I would recommend you to contact your local PI representative to discuss alternative solutions.

Thanks for the answer. No, I wasn't aware that PeakSwitch is obsolete. In such a case I'd like to know the details on the magnetic amps - I'd like to use this idea in a power supply for an audio amp (50-70W). I need symetric voltages +/-24V and possibly low power +/-15V. Which chip would you recommend?

Mark

Hi

Please find the spec for MP1305: "MAGAMP Square Loop Cores, METGLAS® Amorphous Alloy 2714A, 3 Turns", The core is amorphous alloy 2714A from metglas, and 3 turns winding.

At this power level of audio amp, we would like to recommend you to use our TOPSwitch JX.

Thanks

Is this spec attached to your message? I cannot see it. I'm interested in the principle tthe magnetic amp works in this circuit. I've usually seen magnetic amp with two windings. In this case we have one winding. So how does it work?

PS: I found a source of the core. I can purchase just for a test.

Mark

Hi,

There is no attached file for the spec, as the spec is very simple: "MAGAMP Square Loop Cores, METGLAS® Amorphous Alloy 2714A, 3 Turns". So use single winding with 3 turns on the core from Metglas.

Magnetic amplifier acts like a inductive element as a controlled switch. It is a coil of wire oound on a core with a relatively square B-H characteristic. This gives the coil too operating modes: when unsaturated, the core causes the coil to act as a high inductance capable of supporting a large voltage with little or no current flow. When the core saturates, the impedance of the coil drops to near zero, allowing current to flow with negligible voltage drop. Thus a mag amp comes the closest yet to a true "ideal switch" with significant benefits to switching regulators.

Hope this helps..

I was looking for a little bit more details of the winding (e.g. wire gauge) - that's why I was confused with this short spec :-).

The explanation of the magnetic amplifier is very good - thank you.

Mark