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| To: | [email protected] |
|---|---|
| Subject: | LF: DC restoration |
| From: | Chris Wilson <[email protected]> |
| Date: | Wed, 17 Jul 2019 14:38:05 +0100 |
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| Reply-to: | [email protected] |
| Sender: | [email protected] |
Hello rsgb, Some Class D LF / MF amps use a diode to DC restore the waveform after the FET driver chip to the gates. Why do they do this, I am thinking the negative part of the waveform would turn OFF the gate harder, assuming the positive part is adequate to turn the gates ON hard enough? Is there any point in using the modern FET's designed to have a negative rail to turn the gates off hard? Cree do the Wolfspeed ones with this feature. I have also noticed that with amps where the input to the driver is capacitively coupled adding a DC restoration diode makes the waveform pretty much exactly 50 / 50 mark space, whereas without one this is not the case. Good idea to use these restoration diodes there? Thanks. -- Best regards, Chris mailto:[email protected] |
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