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LT4250 Hotswap



		

			

									
					    mohsenhaghighat70
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 11, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT4250 
    
    		        		    		    	
			
    Hello 
    

    we need a circuit to understand that the input voltage has a correct value, If it does not have correct value, we need to detect it.
    

    we use LT4250 for this purpose, but we do not need the current sensing of LT4250 IC,
    

    We design the blow circuit, but the Power good signal does not work correctly, Can anyone know, where is the problem?
    

    

      
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Sep 29, 2022 6:04 PM
            
            
					
      
	
      

		
		
      
					
      Hello,  It is better to use a voltage supervisor instead of a hot swap for your voltage monitoring application. I calculate UV rising threshold as 32.43V, not 43V. Double check the resistor values. Since DRAIN is shorted to VEE, PWRGD# should only depend on GATE. Probe GATE to see if it rises high and is within Vgh of dVgate (see datasheet page 5). C23 and C24 will add a long delay and can be removed. You can also simulate this circuit in LTspice.
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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