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What is the use of auxiliary winding in smps transformer ?

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vishal3558

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hi,
i want to design a Isolated power supply of:
Input=10-13 VDC
Output= +/- 30 VDC @ +/- 1A ripples less than 500 mV
and +5 VDC, +3.3 VDC @ 300mA ripples less than 10mV

I have an requirement for flyback converter or SMPS transformer. but i can't understand the function of auxiliary winding. can anyone please help me.
i have also choose some transformer, 750370059 of Wurth Electronics . is this transformer help me.
 

The auxiliary winding of the transformer can be used for indirect feedback to control the isolated output, also provides demagnetization detection and powers the IC after start-up.
This '750370059 transformer' of Wurth Electronics not suitable for your application, primary to secondary turn ratio 3:1:1, in order to obtain +/- 30V from 12V power supply you need 1: 3: 3
 
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    sabaz

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Hello Sir,

thank you sir for your help....you solve my confusion..thank you.
you said in order to obtain +/- 30V from 12V power supply you need 1: 3: 3.

but if we also want to obtain +3.3 VDC and +5 VDC from 12 V with separate ground what primary to secondary turn ratio we need??
 

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