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The LT8316 is a micropower, high voltage flyback controller. No opto-isolator is needed for regulation. The device samples the output voltage from the...
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LT8316 on Analog.com

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What is "VSENSE(MIN)" and what does it mean?

		
	
				

			

									
					    Normal21
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jul 7, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about the VSENSE(MIN) parameter in the LT8316 datasheet. The final answer explained that VSENSE(MIN) is the minimum voltage level required for the switch to turn off, ensuring proper sampling of the output voltage during light load conditions. This is crucial for maintaining reliable operation and proper CC control in Low Ripple Burst Mode, as detailed in the datasheet on pages 9 and 10.
                        	    

                
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Product Number:  LT8316 

    		        		    		    

		    		    
		    			

			    
Hello, 


 The "ELECTRICAL CHARACTERISTICS" table on page 3 of the datasheet lists an item called "VSENSE(MIN)."


 Could you please explain what this is? I have searched the datasheet but could not find a description.


 I am speculating—does failing to exceed this VSENSE voltage level result in adverse effects, such as a function not executing


 or operation becoming unreliable? Is it possible that this leads to issues like a failure in proper CC (constant current) control?


Thanks,

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 13, 2026 12:54 PM
            
            
						
			            		
    
		
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    Hello,
    

    No-opto flybacks must deliver some energy to the output to sense the reflected output voltage. For the LT8316, the switch will stay on until VSENSE min is reached. At light loads, the switch frequency is reduced to limit how much energy is delivered. This operation mode is covered in the Low Ripple Burst Mode Operation section of the datasheet on pages 9 and 10.
    

    "Unlike traditional flyback converters, the MOSFET has to turn on and off to generate a flyback pulse in order to update the sampled output voltage. The duration of a well-formed flyback pulse must exceed the minimum-off time for proper sampling. To this end, a minimum switch turn-off current is necessary to ensure a flyback pulse of sufficient duration."
    

    Best Regards,
    

    Eric
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

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                on Jul 14, 2026 8:46 PM
            
            
						
			            		
    
		
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    Hello Eric,
    

    Thank you for the information. I understand that the transformer primary current flows until VSENSE(MIN) is reached. My understanding is that if the primary current does not exceed VSENSE(MIN) during the MOSFET's ON period, the MOSFET is forced OFF based on some other time limit; is this correct?
    

    Best Regards,
    

    Normal21
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

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