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LTC4364 Recommended for New Designs
The LTC4364 surge stopper with ideal diode controller protects loads from high voltage transients. It limits and regulates the output during an overvoltage...
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LTC4364 on Analog.com

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LTC4364 mosfet burning

		
	
				

			

									
					    hamed
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 22, 2022 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user experienced MOSFET burnout when using two LTC4364 ideal diodes to power motor drivers with 1000uF total capacitance. The issue is likely due to inrush current exceeding the MOSFET's SOA. The final answer suggests checking the layout guidelines and using an oscilloscope to analyze waveforms. The user is advised to contact a local FAE or submit a support ticket for further assistance.
                        	    
    
                
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    Hi,
    

    I used two LTC4364 as an ideal diode for my project in which there are 10 motor drivers and actuators and I used these ideal diodes to power these drivers.
    

    I should mention that each drive has about 100uf capacitors. (So we have a 1000uf cap on the load side in total)
    

    Input voltage= 54.6v
    

    continuous current= 10A
    

    Peak current =40A(100ms)
    

    

    Test just with a resistive load:
    

    I tested the board(just P1) with a resistive load(6.8 ohms) and the current was about 8A in two different ways:
    

    By using a switch on the load side:  mosfet temp increased and after about 1s mosfet Q1 burned.
    

    Without using the switch on the load side: Nothing happened and the test was successful.
    

    Considering these results I assumed that the mosfet SOA is not enough for a huge initial current.
    

    

    Test with motor drives
    

    In the other test, I just connected the board to the motor drives and the initial load was just the drives' capacitors. When I power on the robot without load side switch, the mosfet burned again.
    

    In one test using a load switch, it happened again and mosfet burned again.
    

    I wonder if you have any comments or recommendations.
    

    Thanks
    

     
    
			
    
			
									
		                             
                        

    
    
                                            
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