So typically, you would design for 100mA at 48Vdc.Spencerleehorton said:Ideally I want to build one Psu feeding 4 channels for 48v
At the minute I have 2 Psu feeding 2 channels each
1000uF will produce about 1V ripple, which should result in less than 1mV ripple at the output. Brute force, like increasing the cap tenfold would result in 0.1mV, but it is better to use an output filter, like 47 ohm/1000uF after the regulator. The series resistor will create a slight voltage drop (less than 1V), but noise would be in the uV region.
You need to make sure the circuit delivers 15mA min. This is usually done by using a 82r resistor between output and adjust. The resistor that goes from adjust to ground will dissipate about 0.7W, so make sure to dimension it properly and make sure it is not too close to other components.