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LT3757 circuit simulation for +/-12V

Question asked by biopico on Feb 13, 2018
Latest reply on Feb 15, 2018 by W.G

Referring to the application note Boost, Flyback, SEPIC and Inverting Controller, I have tried to stimulate the output voltage using LTSPICE for the +/-12V circuit (Page 32).

http://cds.linear.com/docs/en/datasheet/3757Afe.pdf 

 

The transformer is 1,2,3,4 windings in parallel at the input to Q1. The base inductance for the transformer winding is 3.9uH and so the effective L=1.225uH. The output is generated as +/-0.5V. When I substitute L=3.9uH the output is close to +/-12V. 

 

Is the transformer inductance calculated as L=1.225 for four windings in parallel for the base L=3.9uH?

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