Hello everyone!
I have started to learn AC to DC SMPS design and I have a question right at the beginning. Consider the following transformer in an SMPS with a control IC, that has a recommended maximum Vcc voltage of 9V and an absolute maximum Vcc voltage of 16V: Myrra 74023 transformer datasheet. The datasheet says that the secondary, marked S4 has a voltage of 18V and the auxiliary has a voltage of 15V. Am I right, that these mean maximum voltages? So, if I set up my control circuit as such, that I want to get 12V at this secondary (e.g.: with a TL431 reference set to 12V and an optocoupler), then I will see about 10 V at the auxiliary? Am I on the right track or I have the chance of burning my control IC because the auxiliary outputs 15V no matter what?
Thank you for your replies in advance!
I have started to learn AC to DC SMPS design and I have a question right at the beginning. Consider the following transformer in an SMPS with a control IC, that has a recommended maximum Vcc voltage of 9V and an absolute maximum Vcc voltage of 16V: Myrra 74023 transformer datasheet. The datasheet says that the secondary, marked S4 has a voltage of 18V and the auxiliary has a voltage of 15V. Am I right, that these mean maximum voltages? So, if I set up my control circuit as such, that I want to get 12V at this secondary (e.g.: with a TL431 reference set to 12V and an optocoupler), then I will see about 10 V at the auxiliary? Am I on the right track or I have the chance of burning my control IC because the auxiliary outputs 15V no matter what?
Thank you for your replies in advance!