spice models lm2575 ADJ

Hi,

Im new Usuar,

I designing the power circuit of a micromotors with Multisim 10.
Vin min: 1,25 V
Vin max: 24 V
Vout: 12 V
Iout load: 660 mA.

Im using lm 2575 Adj, but in multisin I haven´t spice models of the lm 2575 Adj.
Can anyone help me get it?

Thanks