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UCC28700: several question for UCC28700

Songzhen Guo
Intellectual 2770 points
Part Number: UCC28700 
Hi experts:
Regarding the application of UCC28700, customer have a few question, could you help us on that?
1: The pspice model customer downloaded on TI's official website cannot be simulated with orcad capture. It always reports an error that the IC is not defined. 
Do we have experience like that? The other devices customer downloaded can be simulated.
2: Is there any way to remove the UVLO function on the VS pin? 
3: The current threshold of CS pin 0.75V is too big, is there any way to lower this threshold, I hope it is between 0.05V and 0.25V.

Best Regards
Songzhen Guo



								


				
				

				
			

		

			
						
									
                			    			                        
						
						
			
			
						
			                        
			
			
				
			  
			

			     
			

		


				    			

						
















	

	

					
    
	
    





		
	
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                          TI__Expert
                        7080 points
                      
    
                          
                   		
		
    
					
    Hi Songzhen,
    

    1. I believe the PSPICE mode had been verified by TI before we upload it to TI.COM , if customer see some problem on their simulation design . they should to examine their setting. 
    

    2. I guess what customer mentioned 'UVLO' on VS pin is what we called AC-input run/stop ,or brown_in /brown_out. this feature can't be removed . but it can be programed to very low level (by using low value Rs1). so in this way it seems be "removed" , details please find in datasheet page 10  chapter 8.3.1.3 . 
    

    3. Firstly , I want to clarify in here is the OCP threshold on CS pin for UCC28700 is 1.5V rather than 0.75V. 0.75V is the maximum regulation threshold. if customer want to lower this threshold, increase current sense resistor is the other method.
    

    Thanks.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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