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HMC788A damaged



		

			

									
					    jerry_12345
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 6, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello, I found a problem when using HMC788A .
    

    

    

    

    

    

    

    

    

    

    

    

    Six pieces of hmc788a share a 5v power supply generated by TPS7A91. Each HMC788A  is biased via a TCCH-80 (minicircuits).
    

    

    

    

    

    

    

    

    
The problem is that some amplifiers would draw a high current (about 400mA) and get damaged . This happens randomly.
    

    

    

    

    

    

    What are the possible reasons for this??
    
										

    
				a
    
[edited by: jerry_12345 at 2:02 AM (GMT -4) on 6 Jun 2021]
				
    
					
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Sep 21, 2021 5:55 PM
            
            
					
        
	
        

		
		
        
					
        Dan,
        

        

        We're seeing the same issue and we are using a 6.7 uH conical inductors from Piconics. We see the same sort of thing. The current draw shoots up and the amp dies. It still passes a signal through it but there is no amplification.
        

        It seems to happen at random. We currently have a system that uses 16 of these amps on 8 RF channels. We've had 4 channels blow in he last hour.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Sep 21, 2021 5:55 PM
            
            
					
          
	
          

		
		
          
					
          Dan,
          

          

          We're seeing the same issue and we are using a 6.7 uH conical inductors from Piconics. We see the same sort of thing. The current draw shoots up and the amp dies. It still passes a signal through it but there is no amplification.
          

          It seems to happen at random. We currently have a system that uses 16 of these amps on 8 RF channels. We've had 4 channels blow in he last hour.
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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