I need to 5V to 5V. It might seem surprising but let me expain. I need to convert a voltage of 5V with 60mV ripple (coming from a PSU doing 120V AC to 5V DC) to say 5V with low ripple.
I'm however struggling to know how I would achieve that at a decent cost. I thought about doing a flyback boost converter to have 5V->6V and then having a LDO on each input subcircuit. I would need to reproduce this x12 times, so the cost would be steep for 12 flybacks ICs + 12 transformers + 12 LDOs.
Given the 12 supplies I must make must all be isolated from one another, the current consumption would be about 20mA per supply, the ripple must be very low, would you have suggestions on how to do this without breaking the bank too much?
Is it possible to have a single flyback IC with 12 outputs? Something like that?
More details for those who would ask questions on why I need this: I have to make 6 input subcircuits for current sensing and 6 for voltage sensing.
The total of 12 inputs must be isolated.
All this is done using a 12 TI AMC1301 isolation amplifiers to either sense the current accross a shunt or the voltage accross a step-down transformer.
Since the AMC1301 is an isolation transformer it's fully differential and necessitates two supplies. It takes about 20 mA from each supply voltage.
I need 12 so it's about 240mA of current consumption. I'm mainly worried about the isolated side (the non isolated side can share the same supply.)
EDIT: I need about 2800VDC isolation for 1 minute.