Products In This Thread

LT3755 Production
The LT3755, LT3755-1 and LT3755-2 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low...
Datasheet
LT3755 on Analog.com

LT3956 Production
The LT3956 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator. It is ideally suited for driving high...
Datasheet
LT3956 on Analog.com

  • State Verified Answer
  • +1 person also asked this people also asked this
  • Replies 1 reply
  • Subscribers 39 subscribers
  • Views 1813 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		












	
	
			
	
			
		
	
	
		

		
Looking for LED driver for 100W 70-75V 2A LED from 9-12V sourc



		

			

									
					    Burhan
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 7, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    My LED specifications are:

    Size: 34*34*1.0mm
    Power: 100W
    Current: 2A
    Voltage: 70-75V
    Peak Irradiance: 8W/cm2
    Viewing Angle: 60 degree
    Chips Arrays: 40 chips, 20 in Series 2 in Parallel
    

    I have searched it out LT3755  and LT3956 but need some expert opinion. 
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
			
													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Nov 7, 2018 11:16 PM
            
            
					
      
	
      

		
		
      
					
      Hello Burhan,
      

      The LT3756-2 is the correct IC for you.
      

      You need to run at low switching frequency to limit high voltage switching losses. I recommend as low as possible.
      

      The current will get rather high, so a large catch diode for high current and high voltage is going to be needed. 10A, 100V.
      

      I see that 75V 2A is 150W, but you need a 100W LED driver. There is a bit of a contradiction there.
      

      Either way, you need the high voltage performance of the LT3756-2.
      

      Good luck,
      

      KSz
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

      •