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LTC4251 Recommended for New Designs
The LTC4251/LTC4251-1/LTC4251-2 negative voltage Hot Swap™ controllers allow a board to be safely inserted and removed from a live backplane. Output current...
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LTC4251 on Analog.com

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LTC4251-1IS6#PBF usage for -230V input protection



		

			

									
					    PMachenahalli624
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 13, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
I have a input protection requirement wherein the unit is subjected to negative
230V AC input.Though the LTC4251 datasheet won't specify usage for 230V maximum operating
voltage,since it is a hotswap controller hope we can use this device -230 VAC input protection
    
As per our design requirement We have a negative AC rail wherein we are generating local negative supplies on
board from negative AC rail(-48VAC). To suffice the protection against negative 230VAC requirement plan to this device
    LTC4251-1IS6#PBF
    

Also I'm unable to buy this device at lower volumes from distributors.
    
Please clarify Whether LTC4251BIS6-1#TRMPBF can be used as replacement to LTC4251-1IS6#PBF
    hope for spice model for LTC4251BIS6-1 is same as LTC4251-1
    


    Thanks,
    Phani.M

    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Hot Swap Controllers
                
                                                    
                 High Voltage Hot Swap Controllers
                
                                                    
                 LTC4251
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      HI Phani,

      LTC4251B-1(LTC4251BIS6-1#TRMPBF)  should be used to replace the LTC4251-1 (LTC4251-1IS6#PBF) as the -B version has improved ruggedness of shunt regulator and both these parts have same operating temperature range.  The LTSPice model is exactly same .

       The part can be used for high voltage due to the floating topology , but will not be able to ride through large AC signal as the gate pull up and pull down strength is different. For rectified AC , the part should work fine even at high voltages.

      As for ordering the parts you can check with the Local FAE support in your region or submit a technical support request at the website. 
      

      

      Regards,
      Ritesh
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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Reply

      


    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      HI Phani,

      LTC4251B-1(LTC4251BIS6-1#TRMPBF)  should be used to replace the LTC4251-1 (LTC4251-1IS6#PBF) as the -B version has improved ruggedness of shunt regulator and both these parts have same operating temperature range.  The LTSPice model is exactly same .

       The part can be used for high voltage due to the floating topology , but will not be able to ride through large AC signal as the gate pull up and pull down strength is different. For rectified AC , the part should work fine even at high voltages.

      As for ordering the parts you can check with the Local FAE support in your region or submit a technical support request at the website. 
      

      

      Regards,
      Ritesh
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

      • 


    


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