This is the ldo out when i used ideal current source pulse v

Question

This is the ldo out when i used ideal current source pulse varying from 0 1mA to 10mA at the output why is the great difference between the 2 testbenches

Luis Henrique Rodovalho · Answer

Both simulations are ok The difference is that the switched resistors results in an abrupt step The ideal current source is not considering that it is a ramp

Mustafa Ahmad · Answer

< U01QTMG2K8R> okay thanks which is better is it better to use ramp current source to avoid abrupt step caused after using switch

Mustafa Ahmad · Answer

I have a problem that i couldn t plot the current of the current source it gives error that no function is defined as i

Mustafa Ahmad · Answer

Screenshot from 2021 10 25 16 43 19 png

Luis Henrique Rodovalho · Answer

All those simulation results are good None resulted in sustaining oscillation just ringing It means the LDO is stable and reasonably fast I m just an researcher The pros have lots of other specs to show Look at this datasheet and their tests <https www ti com lit ds symlink lp5907 pdf ts=1635143762511 amp ref url=https 253A 252F 252Fwww ti com 252Fproduct 252FLP5907>

Luis Henrique Rodovalho · Answer

Your simulation has a current source instance inside the control structure It should be outside it I think

Mustafa Ahmad · Answer

I put it outside the control statement and i got the same problem also using ideal current source affects the other simulations rather than load transient

Luis Henrique Rodovalho · Answer

Maybe you should also put a DC 0 statement in your IL instance besides the PWL one so it doesn t affect the other simulations

Mustafa Ahmad · Answer

okay i did this and it worked thanks I want to verify that my testbench is correct that i measure the output at load of 0 1mA and at load of 1mA after waiting for settling time