LM1875 ltspice model

Anthony C Smith · 3rd October 2007, 08:37 AM

Does anyone have a ltspice model of the lm1875 from national?
they used to print a spice model in the data sheet IIRC, but I can't find it anymore.
all help gratefully appreciated
TIA
Anthony

f.sessink · 31st October 2007, 09:12 PM

May this can help you: Laplace expression for small-signal can be used to investigate feedback and stability of the LM1875.

The expression that I use in a Laplace block in SIMetrix (evaluation version is sufficient) is:
73000000/(s+2500)/(1e-7*s+1)/(2e-8*s+1)

This is of course a very rough simplification. The Boucherot compensation for inductive output compensation can NOT be investigated with this simple model.

FS

Anthony C Smith · 2nd November 2007, 05:58 AM

Thanks for this-
its the model with the compensation I was after- have modeled it with an adjusted op amp, but I want to investigate the stability margins.
regards

3rd October 2007, 08:37 AM	#1
Anthony C Smith diyAudio Member Join Date: Jun 2005 Location: Sunderland	LM1875 ltspice model Does anyone have a ltspice model of the lm1875 from national? they used to print a spice model in the data sheet IIRC, but I can't find it anymore. all help gratefully appreciated TIA Anthony __________________ Anthony C Smith MAES MinstSCE -I think rain is wet so who am I to Judge-

2nd November 2007, 05:58 AM	#3
Anthony C Smith diyAudio Member Join Date: Jun 2005 Location: Sunderland	Thanks for this- its the model with the compensation I was after- have modeled it with an adjusted op amp, but I want to investigate the stability margins. regards __________________ Anthony C Smith MAES MinstSCE -I think rain is wet so who am I to Judge-

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
10m45s LTspice model	dave slagle	Tubes / Valves	11	10th August 2012 08:38 PM
Does anyone know of an LTSpice model for 12B4?	ray_moth	Tubes / Valves	2	28th May 2008 09:12 AM
LTSPICE IRF820 model	rafafredd	Pass Labs	2	11th August 2007 05:01 PM
LTSpice - some help with model needed	Cybergent	Everything Else	4	29th October 2005 11:14 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

31st October 2007, 09:12 PM	#2
f.sessink diyAudio Member Join Date: Oct 2007	May this can help you: Laplace expression for small-signal can be used to investigate feedback and stability of the LM1875. The expression that I use in a Laplace block in SIMetrix (evaluation version is sufficient) is: 73000000/(s+2500)/(1e-7s+1)/(2e-8s+1) This is of course a very rough simplification. The Boucherot compensation for inductive output compensation can NOT be investigated with this simple model. FS