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About LTC3588-1

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