Products Mentioned

LTM4608A Production
The LTM4608A is a complete 8A switch mode DC/DC power supply with ±1.75% total output voltage error. Included in the package are the switching controller...
Datasheet
LTM4608A on Analog.com

Thread Details

  • State Verified Answer
  • Replies 1 reply
  • Subscribers 40 subscribers
  • Views 583 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
Output over voltage protection in LTM4608A

		
	
				

			

									
					    SPatil845
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 9, 2019 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    As mentioned in datasheet, Pgood voltage will pull down to ground when more voltage (+10%) applied at output side but still at SW node,switching pulses are present as shown in below simulation waveforms.
    

     
    

    

    Pls suggest how to test OVP feature in LTM4608A....
    
			
    
			
									
		                             
                        

    
    
                                            
                 µModule Buck Regulators
                
                                                    
                 LTM4608A
                
                                                    
                 µModule Regulators
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Apr 11, 2019 8:15 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      For LTM4608A, if output voltage has over voltage, the part still switches to try to sink current. If LTM4608A tries to start into a pre-charged load, and if the reverse current flowing from VOUT back through the bottom N-Channel power MOSFET to PGND is greater than 7A, the internal current comparator trips and shuts off the bottom N-Channel power MOSFET to protect it from being destroyed. The top switch will turn on until the next clock oscillator comes in. Thanks!
      

      

      Yan
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

      •