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LM2596S-ADJEVM: unable to get to adjustable output voltage

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Part Number:LM2596S-ADJEVM

Hello,

In my application input voltage is fixed  24V but i need to vary the output from 6 volts to  16V.  i am planning to use  LM2596 Adj. because by varying the voltage at Feedback pin Output voltage will vary. As mentioned in Datasheet If we vary the R2 value  which is connected to Feedback pin,  output voltage vary.. My doubt is If i provide external variable voltage at Feedback pin, Can i control the out put voltage?

I tried by connecting external voltage at Feedback pin but always Switch is off condition. 


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