TL431: Can it regulate 300V DC? - Page 2 - diyAudio
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Old 26th September 2005, 03:29 AM   #11
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The tube cad doesn't show the pole compensation required for the TL431 otherwise it can nicely oscillate. In the real world this device can behave otherwise and is one of typical omissions using such computer programs. Bread board and suss it out..

richj
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Old 26th September 2005, 11:45 AM   #12
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Quote:
Originally posted by richwalters
The tube cad doesn't show the pole compensation required for the TL431 otherwise it can nicely oscillate. In the real world this device can behave otherwise and is one of typical omissions using such computer programs. Bread board and suss it out..

richj
the compensation for the TL431 is discussed in the September 15th 2005 issue of EDN --

the device doesn't have to be looked at as a black box --

SUBCKT TL431 7 6 11
* K A FDBK
.MODEL DCLAMP D (IS=13.5N RS=25M N=1.59
+ CJO=45P VJ=.75 M=.302 TT=50.4N BV=34V IBV=1MA)
*V1 1 6 2.495 ; used for fixed reference, replaced with EB1 Limiter
EB1 1 6 Value = { IF ( V(7,6)> 2.495, 2.495, V(7,6) ) }
R1 6 2 15.6
C1 2 6 .5U
R2 2 3 100
C2 3 4 .08U
R3 4 6 10
G2 6 8 3 6 1.73
D1 5 8 DCLAMP
D2 7 8 DCLAMP
V4 5 6 2
G1 6 2 1 11 0.11
.ENDS

note that the model on TI's website lacks the reactive components.
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