sorry , forgot...this is the circuit that causes the ripple.
it is 10W boost LED driver.
The resonant frequency of the output LC filter (72KHz) is excited when the input volts jumps upwards.
I cannot stop this as i need the output LC filter for EMC.
Also, since the bandwidth of a continuous mode boost is so inherently low, i cannot use compensation to avoid it, but can only reduce it , though not enough.
There are only few designs, that can tolerate high Q LC filters in power supply. This one apparently isn't among them, because it's intended to work with a pulsed supply voltage.
Without reducing the filter Q, you won't come far, I fear.