Stability Analysis of DCDC switch regulator

[jackyhsu]

regulator stability analysis

Dear advanced:
Like title ,does any one have experience about it (Boost or Buck)?
1.How to face switch on/off condition( to form dc bias)?
2.I kown there are average model in Book by Prof Erickson of Colorado university.
for example (CCM):
.subckt CCM2 1 2 3 4 5
+ Ron=0 VD=0 RD=0
Er 1 1x volt='i(Et)*(Ron+(1-v(5))*RD/v(5))/v(5)'
Et 1x 2 volt='(1-v(5))*(v(3,4)+VD)/v(5)'
Gd 4 3 volt='(1-v(5))*i(Et)/v(5)'
.ends
does anyone use it to analysis stability of dcdc switch converter?
Thanks.

 

[electronrancher]

sure, i have used the averaged switch models from erickson - they are pretty good. the model is just a model of the power stage - ie the modulator and switch. you add your own error amp to get a real converter that you can model. it's nice because you can run ac simulations to watch the gain/phase changes with load, etc.

 

[benedict_arun]

I would prefer to run the simulation using Periodic Steady State of simulator such as Cadence. The results would be independent of models and we can really see the effects of comparator is tripping correctly and parasitics involved.