How to install PSpice model of TI TL431 to LTspice.

1. Download PSpice model from TI web page.
   open page "http://www.tij.co.jp/product/jp/tl431".
   click link "TL431 Family PSpice Transient and AC Model".

2. Unzip the downloaded PSpice model file, and modify tl431.lib as follows,

before: .SUBCKT TL431 7 6 11
after:  .SUBCKT TL431ti 7 6 11

3. Copy tl431.lib file to LTspice lib\sub folder.
   Note. LTspice lib\sub folder varys as follows,
    C:\Program Files\LTC\SwCADIII\lib\sub (Using LTspice III or updated to IV).
    C:\Program Files\LTC\LTspiceIV\lib\sub (Using LTspice IV)
    C:\Program Files (x86)\LTC\LTspiceIV\lib\sub (Using LTspice IV on 64bit windows.)

4. Copy TL431TI.asy to LTspice lib\sym\misc folder.
   Note. LTspice lib\sym\misc folder varys as follows,
    C:\Program Files\LTC\SwCADIII\lib\sym\Misc (Using LTspice III or updated to IV).
    C:\Program Files\LTC\LTspiceIV\lib\sym\Misc (Using LTspice IV)
    C:\Program Files (x86)\LTC\LTspiceIV\lib\sym\Misc (Using LTspice IV on 64bit windows.)

   Note. Download TL431TI.asy from http://www.ftechworks.mydns.jp/blog/tl431ti/TL431TI.asy