Large ripple on output voltage and voltage dropping at higher load
Hello PI Engineers, always great reading these help topics. I need your help again.
I am using an LNK304DG-TL chip with a 680 uH output inductor to have 100 mA output load.
I am seeing 456 mV of ripple on the output. I am measuring with a very short ground loop on my oscilloscope probe.
I have tried using a 0.1 uF and 0.0022 uF capacitors parallel to the output and have gotten it to reduce to 308 mV.
Please find the design attached. We want to get it down to 100 mV. Would really appreciate your help.
Also, when loading the output at 70 mA and over the voltage drops to 10.75V, when we expect 11.70V.