• State Verified Answer
  • Replies 6 replies
  • Subscribers 38 subscribers
  • Views 3226 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
LT3420 as HV power supply. 



		

			

									
					    George-H
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 16, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I need a HV (250-300V) power supply to bias an avalanche photo-diode (current ~1 mA max).  The spec sheet of the LT3420 says it can be used as a supply but there are no details.  Is it possible to have it always charging?  And not have the charging block turn on and off.  Or should I try another IC?  (LT3750?)  Or something like figure 13 from here.
    
 
    http://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf 
    
 
    Thank you,
    
 
    George  
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
		
	
	



      
	
      
		
      
							
					
      
		
      
			
													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Apr 18, 2018 10:38 PM
            
            
					
        
	
        

		
		
        
					
        Hi Victor.  I thought this was email?  Anyway the company I work for is Teachspin Inc.
        
 
        (website at teachspin.com)
        
 
        Unfortunately our volumes are very low.  Maybe 10-50 units a year… it might not even turn into a product.
        
 
        Say I attached a LTspice file.  I tried designing this using a CCM, but I had to up the current and it looks to be DCCM.  Is that typical for these types of flybacks?  I don’t see how to make it different except with a much bigger inductor.
        
 
        George Herold
        
 
        Teachspin Inc.
        
 
        2495 Main St. Suite 409
        
 
        Buffalo NY. 14214
        
 
        716 885-4701
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

        • 

	
      



Reply

        


      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Apr 18, 2018 10:38 PM
            
            
					
          
	
          

		
		
          
					
          Hi Victor.  I thought this was email?  Anyway the company I work for is Teachspin Inc.
          
 
          (website at teachspin.com)
          
 
          Unfortunately our volumes are very low.  Maybe 10-50 units a year… it might not even turn into a product.
          
 
          Say I attached a LTspice file.  I tried designing this using a CCM, but I had to up the current and it looks to be DCCM.  Is that typical for these types of flybacks?  I don’t see how to make it different except with a much bigger inductor.
          
 
          George Herold
          
 
          Teachspin Inc.
          
 
          2495 Main St. Suite 409
          
 
          Buffalo NY. 14214
          
 
          716 885-4701
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

          • 


        


Children
	
        No Data