Model for LM386 audio amp?

J

Joe

Guest
Does anyone know where I may obtain a model for the LM386 audio amplifier
IC? I am using LTSPICE.

Thanks,
Joe
 
In article <BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net>,
Joe <nuisancewildlife@nospamearthlink.net> wrote:
Does anyone know where I may obtain a model for the LM386 audio amplifier
IC? I am using LTSPICE.
Click to expand...
Can I assume that you've tried national's site?

IIRC, the LM386 doesn't have that much inside. You may be able to make
your own that performs well enough.


--
--
kensmith@rahul.net forging knowledge
 
Joe wrote:
Does anyone know where I may obtain a model for the LM386 audio amplifier
IC? I am using LTSPICE.

Thanks,
Joe
Click to expand...

Did you try:

www.national.com

???

Unfortunately, at this page:

http://www.national.com/appinfo/amps/0,2175,815,00.html

Your device doesn't seem to be listed.

Be patient to see if anyone responds with a model they can send you.

Good luck!

--
_____________________
Christopher R. Carlen
crobc@earthlink.net
Suse 8.1 Linux 2.4.19
 
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net...
Does anyone know where I may obtain a model for the LM386 audio amplifier
IC? I am using LTSPICE.
Click to expand...
Hello Joe,
you could try this one, but please be carefully about the limitations of
this model.
I have no clue about how precise this model is.
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3qfqhe%2411f%40ixnews2.ix.netcom.com

Best Regards,
Helmut
 
"Chris Carlen" <crobc@BOGUS_FIELD.earthlink.net> wrote in message
news:c458dd0pp5@enews3.newsguy.com...
Joe wrote:
Does anyone know where I may obtain a model for the LM386 audio
amplifier
IC? I am using LTSPICE.

Thanks,
Joe


Did you try:

www.national.com

???

Unfortunately, at this page:

http://www.national.com/appinfo/amps/0,2175,815,00.html

Your device doesn't seem to be listed.

Be patient to see if anyone responds with a model they can send you.

Good luck!

--
_____________________
Christopher R. Carlen
crobc@earthlink.net
Suse 8.1 Linux 2.4.19
Click to expand...
Hello Chris,

Yes, that was the first place I looked. I have all their models, but that
one does not seem to be there.

Joe
 
"Ken Smith" <kensmith@violet.rahul.net> wrote in message
news:c458g6$dpl$3@blue.rahul.net...
In article <BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net>,
Joe <nuisancewildlife@nospamearthlink.net> wrote:
Does anyone know where I may obtain a model for the LM386 audio amplifier
IC? I am using LTSPICE.

Can I assume that you've tried national's site?

IIRC, the LM386 doesn't have that much inside. You may be able to make
your own that performs well enough.


--
--
kensmith@rahul.net forging knowledge

Hi Ken,
Click to expand...

I don't think I would know where to begin.

Regards,
Joe
 
"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message
news:c45bt6$k4d$03$1@news.t-online.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net...
Does anyone know where I may obtain a model for the LM386 audio
amplifier
IC? I am using LTSPICE.


Hello Joe,
you could try this one, but please be carefully about the limitations of
this model.
I have no clue about how precise this model is.

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3qfqhe%2411
Click to expand...
f%40ixnews2.ix.netcom.com
Best Regards,
Helmut
Click to expand...
Hi Helmut,

Thanks for the link. I have downloaded the subckt and I plan on trying it,
but it looks like some things in there that I have never seen before and I
am not sure if LTSPICE knows what they are but I will give it a try.

Regards,
Joe
 
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:zdG9c.4928$lt2.522@newsread1.news.pas.earthlink.net...
"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message
news:c45bt6$k4d$03$1@news.t-online.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net...
Does anyone know where I may obtain a model for the LM386 audio
amplifier
IC? I am using LTSPICE.


Hello Joe,
you could try this one, but please be carefully about the limitations of
this model.
I have no clue about how precise this model is.


http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3qfqhe%2411
f%40ixnews2.ix.netcom.com

Best Regards,
Helmut

Hi Helmut,

Thanks for the link. I have downloaded the subckt and I plan on trying it,
but it looks like some things in there that I have never seen before and I
am not sure if LTSPICE knows what they are but I will give it a try.
Click to expand...
Hello Joe,
there is nothing strange in that model.
Put all the three files(lm396_test.asc, lm386.sub, lm386.asy) into one
working directory.
Open and run the schematic "lm386_test.asc" with LTSPICE.

Best Regards,
Helmut



The test schematic "lm386_test.asc".
------------------------------------


Version 4
SHEET 1 880 680
WIRE 336 192 416 192
WIRE 416 240 416 192
WIRE 416 192 480 192
WIRE 416 304 416 336
WIRE 416 416 416 448
WIRE 544 192 592 192
WIRE 592 192 592 288
WIRE 592 368 592 448
WIRE 240 256 240 288
WIRE 240 128 240 -48
WIRE 240 -48 144 -48
WIRE -128 96 -128 64
WIRE -128 -16 -128 -48
WIRE 208 160 176 160
WIRE 176 160 176 176
WIRE 208 224 128 224
WIRE 48 224 -16 224
WIRE -16 272 -16 224
WIRE -16 352 -16 400
WIRE -80 -48 -128 -48
WIRE 144 -48 144 -16
WIRE 144 96 144 48
WIRE 144 -48 0 -48
FLAG 416 448 0
FLAG 592 448 0
FLAG 240 288 0
FLAG -128 96 0
FLAG 176 176 0
FLAG -16 400 0
FLAG 592 192 out
FLAG -16 224 in
FLAG 144 96 0
SYMBOL cap 480 208 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C1
SYMATTR Value 220ľ
SYMBOL cap 400 240 R0
SYMATTR InstName C2
SYMATTR Value 47n
SYMBOL res 400 320 R0
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL res 576 272 R0
SYMATTR InstName R3
SYMATTR Value 8
SYMBOL voltage -128 -32 R0
SYMATTR InstName V1
SYMATTR Value 9V
SYMBOL res 32 240 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -16 256 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1
SYMATTR InstName V2
SYMATTR Value SINE(0 0.1 1k)
SYMBOL D:\\Daten\\Ltc_spice_neu\\LM386\\LM386 256 128 R0
SYMATTR InstName U1
SYMBOL cap 128 -16 R0
SYMATTR InstName C3
SYMATTR Value 47ľ
SYMATTR SpiceLine Rser=0.5
SYMBOL res -96 -32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 0.5
TEXT -192 -168 Left 0 ;.tran 10m
TEXT -192 -208 Left 0 !.ac dec 100 1 1000k
TEXT -176 -88 Left 0 ;Battery
RECTANGLE Normal 32 144 -192 -112 2




The model file "lm386.sub".
---------------------------


* Model from Dave Dilatush
* lm386 subcircuit model follows:

* IC pins: 2 3 7 1 8 5 6 4
* | | | | | | | |
..subckt lm386 inn inp byp g1 g8 out vs gnd

* input emitter-follower buffers:

q1 gnd inn 10011 ddpnp
r1 inn gnd 50k
q2 gnd inp 10012 ddpnp
r2 inp gnd 50k

* differential input stage, gain-setting
* resistors, and internal feedback resistor:

q3 10013 10011 10008 ddpnp
q4 10014 10012 g1 ddpnp
r3 vs byp 15k
r4 byp 10008 15k
r5 10008 g8 150
r6 g8 g1 1.35k
r7 g1 out 15k

* input stage current mirror:

q5 10013 10013 gnd ddnpn
q6 10014 10013 gnd ddnpn

* voltage gain stage & rolloff cap:

q7 10017 10014 gnd ddnpn
c1 10014 10017 15pf

* current mirror source for gain stage:

i1 10002 vs dc 5m
q8 10004 10002 vs ddpnp
q9 10002 10002 vs ddpnp

* Sziklai-connected push-pull output stage:

q10 10018 10017 out ddpnp
q11 10004 10004 10009 ddnpn 100
q12 10009 10009 10017 ddnpn 100
q13 vs 10004 out ddnpn 100
q14 out 10018 gnd ddnpn 100

* generic transistor models generated
* with MicroSim's PARTs utility, using
* default parameters except Bf:

..model ddnpn NPN(Is=10f Xti=3 Eg=1.11 Vaf=100
+ Bf=400 Ise=0 Ne=1.5 Ikf=0 Nk=.5 Xtb=1.5 Var=100
+ Br=1 Isc=0 Nc=2 Ikr=0 Rc=0 Cjc=2p Mjc=.3333
+ Vjc=.75 Fc=.5 Cje=5p Mje=.3333 Vje=.75 Tr=10n
+ Tf=1n Itf=1 Xtf=0 Vtf=10)

..model ddpnp PNP(Is=10f Xti=3 Eg=1.11 Vaf=100
+ Bf=200 Ise=0 Ne=1.5 Ikf=0 Nk=.5 Xtb=1.5 Var=100
+ Br=1 Isc=0 Nc=2 Ikr=0 Rc=0 Cjc=2p Mjc=.3333
+ Vjc=.75 Fc=.5 Cje=5p Mje=.3333 Vje=.75 Tr=10n
+ Tf=1n Itf=1 Xtf=0 Vtf=10)

..ends
*----------end of subcircuit model-----------




The symbol file "lm386.asy".
----------------------------


Version 4
SymbolType CELL
LINE Normal -32 0 64 64
LINE Normal -32 128 64 64
LINE Normal -32 0 -32 128
LINE Normal -28 32 -20 32
LINE Normal -28 96 -20 96
LINE Normal -24 100 -24 92
LINE Normal 16 0 16 32
LINE Normal -16 128 -16 117
LINE Normal -21 19 -13 19
LINE Normal -17 15 -17 23
LINE Normal -20 110 -12 110
LINE Normal 48 0 48 53
LINE Normal -16 0 -16 11
LINE Normal 32 85 32 128
LINE Normal -32 32 -48 32
LINE Normal -32 96 -48 96
LINE Normal 64 64 80 64
TEXT -49 19 Left 0 2
TEXT -49 83 Left 0 3
TEXT -9 3 Left 0 6
TEXT -9 124 Left 0 4
TEXT 19 21 Left 0 1
TEXT 52 41 Left 0 8
TEXT 35 99 Left 0 7
TEXT 62 78 Left 0 5
WINDOW 0 64 16 Left 0
WINDOW 3 48 120 Left 0
SYMATTR Value LM386
SYMATTR Prefix X
SYMATTR SpiceModel LM386.sub
SYMATTR Value2 LM386
SYMATTR Description Audio Power Amplifier
PIN -48 32 NONE 0
PINATTR PinName In-
PINATTR SpiceOrder 1
PIN -48 96 NONE 0
PINATTR PinName In+
PINATTR SpiceOrder 2
PIN 32 128 NONE 8
PINATTR PinName B
PINATTR SpiceOrder 3
PIN 16 0 NONE 0
PINATTR PinName COMP2
PINATTR SpiceOrder 4
PIN 48 0 NONE 0
PINATTR PinName V+
PINATTR SpiceOrder 5
PIN 80 64 NONE 0
PINATTR PinName OUT
PINATTR SpiceOrder 6
PIN -16 0 NONE 0
PINATTR PinName COMP1
PINATTR SpiceOrder 7
PIN -16 128 NONE 0
PINATTR PinName V-
PINATTR SpiceOrder 8
 
"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message
news:c47g4t$jh5$05$1@news.t-online.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:zdG9c.4928$lt2.522@newsread1.news.pas.earthlink.net...

"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message
news:c45bt6$k4d$03$1@news.t-online.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net...
Does anyone know where I may obtain a model for the LM386 audio
amplifier
IC? I am using LTSPICE.


Hello Joe,
you could try this one, but please be carefully about the limitations
of
this model.
I have no clue about how precise this model is.



http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3qfqhe%2411
f%40ixnews2.ix.netcom.com

Best Regards,
Helmut

Hi Helmut,

Thanks for the link. I have downloaded the subckt and I plan on trying
it,
but it looks like some things in there that I have never seen before and
I
am not sure if LTSPICE knows what they are but I will give it a try.


Hello Joe,
there is nothing strange in that model.
Put all the three files(lm396_test.asc, lm386.sub, lm386.asy) into one
working directory.
Open and run the schematic "lm386_test.asc" with LTSPICE.

Best Regards,
Helmut



The test schematic "lm386_test.asc".
------------------------------------


Version 4
SHEET 1 880 680
WIRE 336 192 416 192
WIRE 416 240 416 192
WIRE 416 192 480 192
WIRE 416 304 416 336
WIRE 416 416 416 448
WIRE 544 192 592 192
WIRE 592 192 592 288
WIRE 592 368 592 448
WIRE 240 256 240 288
WIRE 240 128 240 -48
WIRE 240 -48 144 -48
WIRE -128 96 -128 64
WIRE -128 -16 -128 -48
WIRE 208 160 176 160
WIRE 176 160 176 176
WIRE 208 224 128 224
WIRE 48 224 -16 224
WIRE -16 272 -16 224
WIRE -16 352 -16 400
WIRE -80 -48 -128 -48
WIRE 144 -48 144 -16
WIRE 144 96 144 48
WIRE 144 -48 0 -48
FLAG 416 448 0
FLAG 592 448 0
FLAG 240 288 0
FLAG -128 96 0
FLAG 176 176 0
FLAG -16 400 0
FLAG 592 192 out
FLAG -16 224 in
FLAG 144 96 0
SYMBOL cap 480 208 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName C1
SYMATTR Value 220ľ
SYMBOL cap 400 240 R0
SYMATTR InstName C2
SYMATTR Value 47n
SYMBOL res 400 320 R0
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL res 576 272 R0
SYMATTR InstName R3
SYMATTR Value 8
SYMBOL voltage -128 -32 R0
SYMATTR InstName V1
SYMATTR Value 9V
SYMBOL res 32 240 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -16 256 R0
WINDOW 123 24 132 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value2 AC 1
SYMATTR InstName V2
SYMATTR Value SINE(0 0.1 1k)
SYMBOL D:\\Daten\\Ltc_spice_neu\\LM386\\LM386 256 128 R0
SYMATTR InstName U1
SYMBOL cap 128 -16 R0
SYMATTR InstName C3
SYMATTR Value 47ľ
SYMATTR SpiceLine Rser=0.5
SYMBOL res -96 -32 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 0.5
TEXT -192 -168 Left 0 ;.tran 10m
TEXT -192 -208 Left 0 !.ac dec 100 1 1000k
TEXT -176 -88 Left 0 ;Battery
RECTANGLE Normal 32 144 -192 -112 2




The model file "lm386.sub".
---------------------------


* Model from Dave Dilatush
* lm386 subcircuit model follows:

* IC pins: 2 3 7 1 8 5 6 4
* | | | | | | | |
.subckt lm386 inn inp byp g1 g8 out vs gnd

* input emitter-follower buffers:

q1 gnd inn 10011 ddpnp
r1 inn gnd 50k
q2 gnd inp 10012 ddpnp
r2 inp gnd 50k

* differential input stage, gain-setting
* resistors, and internal feedback resistor:

q3 10013 10011 10008 ddpnp
q4 10014 10012 g1 ddpnp
r3 vs byp 15k
r4 byp 10008 15k
r5 10008 g8 150
r6 g8 g1 1.35k
r7 g1 out 15k

* input stage current mirror:

q5 10013 10013 gnd ddnpn
q6 10014 10013 gnd ddnpn

* voltage gain stage & rolloff cap:

q7 10017 10014 gnd ddnpn
c1 10014 10017 15pf

* current mirror source for gain stage:

i1 10002 vs dc 5m
q8 10004 10002 vs ddpnp
q9 10002 10002 vs ddpnp

* Sziklai-connected push-pull output stage:

q10 10018 10017 out ddpnp
q11 10004 10004 10009 ddnpn 100
q12 10009 10009 10017 ddnpn 100
q13 vs 10004 out ddnpn 100
q14 out 10018 gnd ddnpn 100

* generic transistor models generated
* with MicroSim's PARTs utility, using
* default parameters except Bf:

.model ddnpn NPN(Is=10f Xti=3 Eg=1.11 Vaf=100
+ Bf=400 Ise=0 Ne=1.5 Ikf=0 Nk=.5 Xtb=1.5 Var=100
+ Br=1 Isc=0 Nc=2 Ikr=0 Rc=0 Cjc=2p Mjc=.3333
+ Vjc=.75 Fc=.5 Cje=5p Mje=.3333 Vje=.75 Tr=10n
+ Tf=1n Itf=1 Xtf=0 Vtf=10)

.model ddpnp PNP(Is=10f Xti=3 Eg=1.11 Vaf=100
+ Bf=200 Ise=0 Ne=1.5 Ikf=0 Nk=.5 Xtb=1.5 Var=100
+ Br=1 Isc=0 Nc=2 Ikr=0 Rc=0 Cjc=2p Mjc=.3333
+ Vjc=.75 Fc=.5 Cje=5p Mje=.3333 Vje=.75 Tr=10n
+ Tf=1n Itf=1 Xtf=0 Vtf=10)

.ends
*----------end of subcircuit model-----------




The symbol file "lm386.asy".
----------------------------


Version 4
SymbolType CELL
LINE Normal -32 0 64 64
LINE Normal -32 128 64 64
LINE Normal -32 0 -32 128
LINE Normal -28 32 -20 32
LINE Normal -28 96 -20 96
LINE Normal -24 100 -24 92
LINE Normal 16 0 16 32
LINE Normal -16 128 -16 117
LINE Normal -21 19 -13 19
LINE Normal -17 15 -17 23
LINE Normal -20 110 -12 110
LINE Normal 48 0 48 53
LINE Normal -16 0 -16 11
LINE Normal 32 85 32 128
LINE Normal -32 32 -48 32
LINE Normal -32 96 -48 96
LINE Normal 64 64 80 64
TEXT -49 19 Left 0 2
TEXT -49 83 Left 0 3
TEXT -9 3 Left 0 6
TEXT -9 124 Left 0 4
TEXT 19 21 Left 0 1
TEXT 52 41 Left 0 8
TEXT 35 99 Left 0 7
TEXT 62 78 Left 0 5
WINDOW 0 64 16 Left 0
WINDOW 3 48 120 Left 0
SYMATTR Value LM386
SYMATTR Prefix X
SYMATTR SpiceModel LM386.sub
SYMATTR Value2 LM386
SYMATTR Description Audio Power Amplifier
PIN -48 32 NONE 0
PINATTR PinName In-
PINATTR SpiceOrder 1
PIN -48 96 NONE 0
PINATTR PinName In+
PINATTR SpiceOrder 2
PIN 32 128 NONE 8
PINATTR PinName B
PINATTR SpiceOrder 3
PIN 16 0 NONE 0
PINATTR PinName COMP2
PINATTR SpiceOrder 4
PIN 48 0 NONE 0
PINATTR PinName V+
PINATTR SpiceOrder 5
PIN 80 64 NONE 0
PINATTR PinName OUT
PINATTR SpiceOrder 6
PIN -16 0 NONE 0
PINATTR PinName COMP1
PINATTR SpiceOrder 7
PIN -16 128 NONE 0
PINATTR PinName V-
PINATTR SpiceOrder 8
Click to expand...
Hello Helmut,

May God bless you! I didn't find those 3 different files at that link, I
don't know why. I did find the subckt and tried creating a .asy with the
8pin dip. Needless to say, it didn't work at all. Now that I have copied
what you have posted above and followed your instructions, it seems to model
the behavior as far as I can see. I will now transfer the new .asy and
subckt into my private directory and start using it in some of my recent
schematics using ultrasound. I will let you know if I find any glitches.

Thank you again for the information

Joe
 
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:%1M9c.4622$Dv2.3537@newsread2.news.pas.earthlink.net...
"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message
news:c47g4t$jh5$05$1@news.t-online.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:zdG9c.4928$lt2.522@newsread1.news.pas.earthlink.net...

"Helmut Sennewald" <HelmutSennewald@t-online.de> wrote in message
news:c45bt6$k4d$03$1@news.t-online.com...
"Joe" <nuisancewildlife@nospamearthlink.net> schrieb im Newsbeitrag
news:BTo9c.3361$Dv2.1815@newsread2.news.pas.earthlink.net...
Does anyone know where I may obtain a model for the LM386 audio
amplifier
IC? I am using LTSPICE.


Hello Joe,
you could try this one, but please be carefully about the
limitations
of
this model.
I have no clue about how precise this model is.




http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3qfqhe%2411
f%40ixnews2.ix.netcom.com

Best Regards,
Helmut

Hi Helmut,

Thanks for the link. I have downloaded the subckt and I plan on trying
it,
but it looks like some things in there that I have never seen before
and
I
am not sure if LTSPICE knows what they are but I will give it a try.


Hello Joe,
there is nothing strange in that model.
Put all the three files(lm396_test.asc, lm386.sub, lm386.asy) into one
working directory.
Open and run the schematic "lm386_test.asc" with LTSPICE.

...


Hello Helmut,

May God bless you! I didn't find those 3 different files at that link, I
don't know why.
Click to expand...
Hello Joe,
there is "only" a complete netlist including the subcircuit on the given
link.
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3qfqhe%2411f%40ixnews2.ix.netcom.com
Anyway thanks to Dave Dilatush for this subcircuit model of the LM386.
I used this subcircuit and made my own symbol and testcircuit
for LTSPICE. That's what I have posted yesterday.
More circuit examples can be found in the LM386 datasheet.
http://www.national.com/ds.cgi/LM/LM386.pdf

Best Regards,
Helmut
 
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