Class D driver (IRS20214) low duty cycle issues

12/02/2015 - 00:10 von Joerg | Report spam
Folks,

Using the class D amp driver chip IRS20214. When operating at a duty
cycle of 3% and above everything is as clean as a whistle. Same at 1%
unless I drive it with an LTC6992 but that's another story. Anyhow, at
around 2% is seems to generate a secondary spike at its input when the
bootstrap node flies. I can muffle it with a cap across the pin but
since it apparently "strikes" inside this does not prevent double
tripping. I am operating it around 150V supply, well within its means.

http://www.irf.com/product-info/dat...20124s.pdf

Tried shielding the IC itself and so on, nothing helped.

Has anyone used this and ran into similar stuff? Any idea why this
doesn't happen at other duty cycles?

I am also wondering how anyone could use IRS as the suffix for an IC :-)

Regards, Joerg

http://www.analogconsultants.com/
 

Lesen sie die antworten

#1 Joerg
12/02/2015 - 00:26 | Warnen spam
Ooops, sorry. Sollte in der s.e.design NG landen.


On 2015-02-11 3:10 PM, Joerg wrote:
Folks,

Using the class D amp driver chip IRS20214. When operating at a duty
cycle of 3% and above everything is as clean as a whistle. Same at 1%
unless I drive it with an LTC6992 but that's another story. Anyhow, at
around 2% is seems to generate a secondary spike at its input when the
bootstrap node flies. I can muffle it with a cap across the pin but
since it apparently "strikes" inside this does not prevent double
tripping. I am operating it around 150V supply, well within its means.

http://www.irf.com/product-info/dat...20124s.pdf

Tried shielding the IC itself and so on, nothing helped.

Has anyone used this and ran into similar stuff? Any idea why this
doesn't happen at other duty cycles?

I am also wondering how anyone could use IRS as the suffix for an IC :-)

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