Hi,
I'd like to build a linear psu to replace a 5VDC 2a walwart that feeds an LT1940 dual step down, switching voltage regulator that generates a 3.3 and 1.2 VDC.
I could use an LT1121 for the 3.3V, but haven't worked with 1.2VDC. Any suggestions on a reg so I can toss the LT1940. This powers a cpu in squeezebox and am told that the tolerances must be pretty tight.
thanks!
I'd like to build a linear psu to replace a 5VDC 2a walwart that feeds an LT1940 dual step down, switching voltage regulator that generates a 3.3 and 1.2 VDC.
I could use an LT1121 for the 3.3V, but haven't worked with 1.2VDC. Any suggestions on a reg so I can toss the LT1940. This powers a cpu in squeezebox and am told that the tolerances must be pretty tight.
thanks!
I don't understand why you're making it so complicated. I have a Squeezebox too. You just need another 5V, 2A wallwart. Just get the Elpac that everyone else uses. Why create a "clean" linear supply for something that has switching regulators, anyway?
Hi, I don't use anything inside the SB except the cpu and logic. I don't use the dac or analog stage, and I'm planning to do away with the display. So I only need to power the cpu (1.2v) and logic (3.3v). I'd like to do away with the switching reg that powers these. I'm searching for a linear reg to power the 1.2v
Diodes. They drop voltage. If you can regulate to 1.9-ish and slap a diode on there, you're done.
Just a thought.
Just a thought.
The LT1940 is rated for 1.4A, so you need to meet that spec. Go to Digikey and search for a 1.2V regulator with 1.5A or more.
The LT1121 is rated for 150mA. Is that enough, when the original part is rated for 1.4A?
The LT1121 is rated for 150mA. Is that enough, when the original part is rated for 1.4A?
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