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Do you use your scheme for just the 555 or 565 as well. If 565, how do you
explicitly ensure the power up/down sequencing requirements of the are met?
In a message dated 8/10/2005 9:32:39 AM Eastern Standard Time,
[email protected] writes:
Just to second what David says really. We use individual regulators,
switched mode to get down to 5V (LM2595) then LDO (LM1117) to 2V6 and 3V3 if
necessary. It all works really well, the reset device is a SOT23 DS1818.
Pete
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
David Brown
Sent: 10 August 2005 13:12
To: [email protected]
Subject: Re: [MPC500] Power IC instead of MC33394
The power supply devices were pretty standard devices we use on many cards -
I think the 5V switcher is an LM2673, and the LDOs are LM1117 adjustable
regulators. The reset device is a LM3724IM5-2.32, which I think is National
Semiconductor. Of course, you'll have to figure out the passive components
around the supplies, depending on your source supply and your power requirements.
I don't think the exact components actually matter much - it's just a
matter of dimensioning them properly according to your board's needs - extra
ripple on the supplies would not go down well with the MPC. And if you need sleep
modes on your card, things are going to be more complicated.
mvh.,
David
[Non-text portions of this message have been removed]
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