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LT3758 Production
The LT3758/LT3758A are wide input range, current mode, DC/DC controllers which are capable of generating either positive or negative output voltages. They...
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LT3758 on Analog.com

LTC3722 Production
The LTC3722-1/LTC3722-2 phase-shift PWM controllers provide all of the control and protection functions necessary to implement a high efficiency, zero...
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LTC3722 on Analog.com

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High Voltage, high Power DC-DC converter with LT3758 (200 - 1.2kV in; 110VDC; 2,5Aout)



		

			

									
					    s.dase
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 9, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT3758 
    
    		        		    		    	
			
    For a PV application, I like to design a High Voltage, high Power DC-DC converter with 200 - 1.2kVDC in and 110VDC; 2,5Aout.
    

    Can I use the LT3758 for it? Does anybody has other suggestions? Evalboards
    

    

    Thank you 
    

    Steffen
    
									
			        
		
    

				
						
        

    
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							FormerMember
					
      
		
      
			
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									FormerMember
							        
			
			
			
    
            
						
                            
            
            				
            
                on Jan 9, 2023 7:22 PM
            

            
					
    
	
    

		
		
    
					
    s.dase said:
    Can I use the LT3758 for it?
    

    No. The maximum input voltage of LT3758 is 100V.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    


	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Feb 1, 2023 12:54 PM
            

            
					
    
	
    

		
		
    
					
    Hello Steffen,
    

    

    I would look at a half bridge LLC. Unfortunately we don't have any LLC controllers.
    

    Another option would be a phase shifted full bridge using the LTC3722.
    

    Due to the high input voltage of 1200V and 250W output a bridge topology would be best because this will clamp the max Vds of the the fets close to 1200V.
    

    You would also need to design a startup circuit to temporarily (10ms -100ms) supply a bias voltage (10V or 15V etc...) to the IC to get things running, then use an aux winding on the main transformer to take over and supply the bias power.
    

    -jason 
    

    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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