Hi everyone,
I'm working on a design for which I've completed all aspects except for the power input and power rails which i saved for last because it seemed logical to do the design starting with all of the things I am requiring the product to do and let these define the power requirements etc.
My design includes two power sources with the primary being a 12V/5A wall transformer and the secondary being a 12V/5aH (or higher aH) lead acid battery. My requirements here are;
I'm not a HW engineer but I have designed and built working prototypes thanks to much of what i've learned here. The design includes op-amps, comparators, digipots, ADCs, a SOC, Ethernet and USB but after several days on the power I'm stuck and seeking some guidance.
The design includes 4 power rails (12V/2A, 5V/.5A, 3V3/3A and 1V8V/.5A) that need to be sequenced and the 3V3 rail actually has what I suppose amounts to 2 rails because I need one portion of the 3V3 to come up before the other due to a sequencing requirement of a chip in the design.
The attached crude illustration shows the concept and the sequencing. The rest of the design i've already done in CircuitStudio and I'm working with a PCB design engineer whose feeding my schematics into his tools to produce the circuit board design.
I've looked at the LTC4162-S but I cannot determine if it will output 12V/5A which I can feed into switching voltage regulators and I'm not positive if this is the "best" solution or what my other options might be. I've searched through the forum and not found something aligned with my ask, if i've missed something please point me to it and i'll dig into it.
thx - sean
I'm working on a design for which I've completed all aspects except for the power input and power rails which i saved for last because it seemed logical to do the design starting with all of the things I am requiring the product to do and let these define the power requirements etc.
My design includes two power sources with the primary being a 12V/5A wall transformer and the secondary being a 12V/5aH (or higher aH) lead acid battery. My requirements here are;
- switch to secondary from primary when primary power is not present (ie: power goes out)
- switch to primary from secondary when primary power is present
- charge the battery from primary
- use battery, via relays, to drive an external device when required (keeps the load off the system power)
I'm not a HW engineer but I have designed and built working prototypes thanks to much of what i've learned here. The design includes op-amps, comparators, digipots, ADCs, a SOC, Ethernet and USB but after several days on the power I'm stuck and seeking some guidance.
The design includes 4 power rails (12V/2A, 5V/.5A, 3V3/3A and 1V8V/.5A) that need to be sequenced and the 3V3 rail actually has what I suppose amounts to 2 rails because I need one portion of the 3V3 to come up before the other due to a sequencing requirement of a chip in the design.
The attached crude illustration shows the concept and the sequencing. The rest of the design i've already done in CircuitStudio and I'm working with a PCB design engineer whose feeding my schematics into his tools to produce the circuit board design.
I've looked at the LTC4162-S but I cannot determine if it will output 12V/5A which I can feed into switching voltage regulators and I'm not positive if this is the "best" solution or what my other options might be. I've searched through the forum and not found something aligned with my ask, if i've missed something please point me to it and i'll dig into it.
thx - sean