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LT3080 Recommended for New Designs
The LT3080 is a 1.1A low dropout linear regulator that can be paralleled to increase output current or spread heat in surface mounted boards. Architected...
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LT3080 on Analog.com

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LT3080 drived by a DAC

		
	
				

			

									
					    Ziller
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 17, 2024 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT3080  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Good morning, I'm trying to drive the LT3080 using a DAC through a differential amplifier like in the picture:
    

     
    

    In the simulation it works perfecly, but in reality I have a discontinuity point under 7V where the VOUT goes to max voltage for some reasons. I move the VIN accordingly to respect the MAX 36V difference between VIN and VOUT.
    
			
    
			
									
		                             
                        

    
    
                                            
                 hardware
                
                                                    
                 LDO Linear Regulators
                
                                                    
                 LT3080
                
                                                    
                 Positive Linear Regulators (LDO)
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Dec 17, 2024 11:57 AM
            
            
						
			            		
      
		
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      Hi.  The LT308X LDOs may behave strangely if SET is driven lower than OUT.  Sorry that is not well stated in the datasheets.  I talk about that issue in many Engineer Zone posts that are basically listed in this one.   If you just clamp OUT to SET with a diode (anode at OUT), you will see that your circuit operates properly.        
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

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