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Driving negative voltages with ADU-M5230



		

			

									
						Sriniketh
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Nov 19, 2015 
				
			
			
		


				
		

		    		    
		    
		    	
			
I would like to drive -700VDC (0VDC at collector of high side igbt and -700VDC at emitter side of low side IGBT) with high side and low side IGBT configuration. I understood isolation is needed because of different ground levels, i would like to use ADU-M5230 gate driver. I would like to know the reference ground voltage for the logic terminals and the output side of the gate driver.

 
Also, Do i need bootstrap circuit in addition to this gate driver?. Can anybody provide a sample application diagram with negative voltages

								


							

				
				
			

					
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	















	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Nov 20, 2015 1:45 AM
            
            
					
    
	
    

		
		
    
					
    Sriniketh:
    
 
    From your schematic, you need to drive two IGBTs in a half bridge configuration, and the bridge voltage is -700V (says -800V) with 0V at the top of the bridge.
    
 
    1. Please tell me what is the frequency that you will drive the gates?
    
 
    2. What is the IGBT manufacturer and part number?
    
 
    3. The ADuM5230 can source 100mA output and sink 300mA output, which may limit the gate capacitance and frequency that it can drive. You may need a transistor buffer stage between the ADuM5230 outputs and the gates of the IGBTs to drive the gates. 
    
 
    4. For the use of a bootstrap circuit, I need to know the min and max duty cycle to see if a bootstrap circuit could work. If the duty cycle is close to 0% or 100% and the frequency is low, the bootstrap circuit may not keep the supply voltage for the ADuM5230 output high enough to drive the outputs.
    
 
    5. What is the output voltage needed for the gate drive? The IGBT datasheet will have the data for this.
    
 
    Regards, Brian
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Nov 20, 2015 1:45 AM
            
            
					
    
	
    

		
		
    
					
    Sriniketh:
    
 
    From your schematic, you need to drive two IGBTs in a half bridge configuration, and the bridge voltage is -700V (says -800V) with 0V at the top of the bridge.
    
 
    1. Please tell me what is the frequency that you will drive the gates?
    
 
    2. What is the IGBT manufacturer and part number?
    
 
    3. The ADuM5230 can source 100mA output and sink 300mA output, which may limit the gate capacitance and frequency that it can drive. You may need a transistor buffer stage between the ADuM5230 outputs and the gates of the IGBTs to drive the gates. 
    
 
    4. For the use of a bootstrap circuit, I need to know the min and max duty cycle to see if a bootstrap circuit could work. If the duty cycle is close to 0% or 100% and the frequency is low, the bootstrap circuit may not keep the supply voltage for the ADuM5230 output high enough to drive the outputs.
    
 
    5. What is the output voltage needed for the gate drive? The IGBT datasheet will have the data for this.
    
 
    Regards, Brian
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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