Hi,
I am making a flyback converter circuit switching at 132kHz (using) and on the secondary side for 5V 2.2A the application notes are suggesting a 2200uF/10V filter capacitor. That capacitor is far too big for my design constraints and while I am going to be outputting 1.2A max the comparable downsized capacitor is still too big.
Now the main thought is that I am using a SMPS to output 5V then using a 5V linear voltage regulator(like LDL212PU50R). The idea is that the voltage regulator would provide stabilization and hopefully smoothing the ripple. The issue is I don't know if the voltage regulator does any of the things I said in the previous sentence. I've read that linear voltage regulators actually impart MORE noise to the signal, so am I wasting my time/hurting my self by adding a secondary voltage regulator?
This is going to be for a dedicated USB power supply so the signal will need to be coherent enough so that cellphones can be charged without the phone throwing a fit because I've seen some so bad that phones just refused to charge all together(I know about command resistors and such)
I am making a flyback converter circuit switching at 132kHz (using) and on the secondary side for 5V 2.2A the application notes are suggesting a 2200uF/10V filter capacitor. That capacitor is far too big for my design constraints and while I am going to be outputting 1.2A max the comparable downsized capacitor is still too big.
Now the main thought is that I am using a SMPS to output 5V then using a 5V linear voltage regulator(like LDL212PU50R). The idea is that the voltage regulator would provide stabilization and hopefully smoothing the ripple. The issue is I don't know if the voltage regulator does any of the things I said in the previous sentence. I've read that linear voltage regulators actually impart MORE noise to the signal, so am I wasting my time/hurting my self by adding a secondary voltage regulator?
This is going to be for a dedicated USB power supply so the signal will need to be coherent enough so that cellphones can be charged without the phone throwing a fit because I've seen some so bad that phones just refused to charge all together(I know about command resistors and such)