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LTC3588-1 Recommended for New Designs
The LTC3588-1 integrates a low-loss full-wave bridge rectifier with a high efficiency buck converter to form a complete energy harvesting solution optimized...
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LTC3588-1 on Analog.com

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About LTC3588-1



		

			

									
					    jeongmin
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 20, 2018 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    we bought the module of ltc3588-1 to solve the problem of triboelectric generator that is too small currnet to turn on led and charge the  capacitor. we connect our generator in pin PZ1 and PZ2. and next we connect our LED with pin VCC and GND. However, it didn't turn on. Therefore, we measure the voltage of VCC using osiloscope. However, it doesn't show the rectified voltage graph and just show the graph of AC. It doesn't rectify the current of generator at all. And we set the output voltage as 3.3V by soldering. However, it shows the output voltage over 3V. What is the reason of this problem? our generator's output voltage and current is about 300V and 3uA. I want your fast feedback. Thank you
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 power management
                
                                                    
                 LTC3588-1
                
                                                    
                 energy harvesting
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hello,
      
 
      It simply sounds like your generator is not powerful enough for your load. Most LEDs take mA of current for a visible output. Your generator may seem like it has a fair power output, but the LTC358801 is a 20V part and will clamp the generator voltage to 20V in order to protect itself. So, the max power you can put in (a very idealized value, since I don't know your generator's power profile) is 20V*3uA = 60uW. Assuming 85% efficiency at a 3.3V output, you might expect 15uA of output current, not nearly enough to power the LED. If the load is too much compared to the input source, the voltage will not be able to reach regulation.
      
 
      Perhaps consider putting your generator through a transformer before the IC to step down the voltage in order to better harvest energy from it with a regulation point under 20V. Even then, though, I'm not sure that your generator is powerful enough for the load that you want to power. Perhaps run through some power conversion calculations to determine whether this is feasible. You can assume maybe 85% efficiency from the regulator.
      
 
      Regards,
      
 
      Zack
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

      Thank you,
      EZ Admin
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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