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ADUM6403 Production
The ADuM640x devices are quad-channel digital isolators with isoPower®, an integrated, isolated DC/DC converter. Based on the Analog Devices, Inc., iCouplerÂ...
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ADUM6403 on Analog.com

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Problem with ouput voltage VISO of ADUM6403

		
	
				

			

									
					    SebastienM
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 9, 2018 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hello,
    
 
    we are using the ADUM6403 using 3.3V for the primary supply voltage and connect the Vsel pin to GNDiso. In this configuration the output voltage on the VISO pin can up to 5.04V instead of 3.3V.
    
 
    The power supply voltage is good. We did also the following configuration:
    
 
    - Vdd1 to 3.3V
    
 
    - GND1 to GND
    
 
    - Via, Vib, Vic, Vid are not connected
    
 
    - Vddl to 3.3V (same used for Vdd1)
    
 
    - GNDiso to GNDiso
    
 
    - Vsel to GNDiso
    
 
    - Vod, Voc, Vob, Voa are not connected
    
 
    A resistor of 160Ohm is connected between the VISO pin and GNDiso. We have also connected a 0.1uF and a 10uF on the output VISO pin. On the tested device, the output voltage is 3.7V (see the attached file).
    
 
    Do you have any ideas?
    
 
    Thank you for your answers.
    
 
    Sorry for my english
    
			
    
			
									
		                             
                        

    
    
                                            
                 isopower
                
                                                    
                 Digital Isolation Technology
                
                                                    
                 ADUM6403
                
                                
            
    
    
    
		
    

							
    
				
				
			
    
					
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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                on Apr 12, 2018 11:52 AM
            
            
						
			            		
        
		
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        Hi,
        
 
        1. The complete part nuber is: ADUM6403 ARIZ #1519* 3139532.1.
        
 
        2. From the last test, I removed the 160 ohm betwwen VISO and GNDISO. I only left the 100nF and 10uF capacitors between VISO and GNDISO. The output VISO still 3.7V.
        
 
        3. We have also ADUM6403s that give 3,87V, 4,29V, 4,46V and 5,04V on the output VISO pin.
        
 
        4. With only 100nF and 10uF capacitors between VISO and GNDISO pins, here VDD1 and VISO signals at power-up:
        
 
        
 
        We got an overshoot up to 4.3V.
        
 
        5. Here the schematic used and the layout:
        
 
        
 
        and the layout
        
 
        
 
        All capacitors are on the bottom
        
 
        Regards,
        
 
        Sebastien
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
		    
		    		    
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Apr 12, 2018 11:52 AM
            
            
						
			            		
          
		
										0
					
	
          

		
		
          
		
          
                                
                                                            
          
					
          Hi,
          
 
          1. The complete part nuber is: ADUM6403 ARIZ #1519* 3139532.1.
          
 
          2. From the last test, I removed the 160 ohm betwwen VISO and GNDISO. I only left the 100nF and 10uF capacitors between VISO and GNDISO. The output VISO still 3.7V.
          
 
          3. We have also ADUM6403s that give 3,87V, 4,29V, 4,46V and 5,04V on the output VISO pin.
          
 
          4. With only 100nF and 10uF capacitors between VISO and GNDISO pins, here VDD1 and VISO signals at power-up:
          
 
          
 
          We got an overshoot up to 4.3V.
          
 
          5. Here the schematic used and the layout:
          
 
          
 
          and the layout
          
 
          
 
          All capacitors are on the bottom
          
 
          Regards,
          
 
          Sebastien
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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