VF5xx/about BCTRL not use case?

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VF5xx/about BCTRL not use case?

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soichiyamamoto
Contributor IV

Hi,

Transistor wants to use DC-DC converter to run a fever.

May it supply 1.2V to VDD directly using DC-DC converter without using external NPN ballast transistor(BCTRL)?

Please give me ISSUE of that case.

Best regards,

soichi yamamoto

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naoumgitnik
Senior Contributor V

Dear Soichi,

Unfortunately, using a transistor is a must.

Please, also take a look at this newly published Application Note - http://cache.freescale.com/files/32bit/doc/app_note/AN4807.pdf?fsrch=1&WT_TYPE=Application%20Notes&W....

Regards, Naoum Gitnik.

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naoumgitnik
Senior Contributor V

Dear Soichi,

Unfortunately, using a transistor is a must.

Please, also take a look at this newly published Application Note - http://cache.freescale.com/files/32bit/doc/app_note/AN4807.pdf?fsrch=1&WT_TYPE=Application%20Notes&W....

Regards, Naoum Gitnik.

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ChrisNielsen
Contributor III

That's a nice app note.  I'm surprised that it doesn't show the A5 at its full capabilitiy of 500 MHz as opposed to the listed 399 MHz.

Are there any issues/concerns with running the A5 at 500 MHz?

Thanks ,Chris

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naoumgitnik
Senior Contributor V

No, there are not as long as it is mentioned in the Datasheet.

/Naoum.

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