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LT3579 Recommended for New Designs
The LT3579 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltage, and overtemperature...
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LT3579 on Analog.com

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LT3579 Vout setting with DAC



		

			

									
					    dk-001
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 22, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi,
    

    For the LT3579 DC/DC converter I'm interested in the dual output as shown in the image below. I would like to be able to control the output voltage with 5V room (e.g. from 15V to 20V) with a DAC or digital pot. Would it be possible?
    

    

    I tried adding a resistor under 130k resistor, which was tied to the ground (i.e. a divider), then connect a DAC (with a resistor in front) to the divider network. But this didn't work in LTspice simulation. One obvious solution is to add a variable resistor in series with 130k resistor, but I'm wondering if there are better solutions.
    

    I'd appreciate any suggestions.
    

    Thanks.
    

    

     
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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