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I'm using a DSN6009 boost converter which uses the XL6009E1 chip, with the following specs:

  • 3-30V input voltage, with an optimal range of 5-30V input voltage
  • 5-35V output voltage, with a maximum current of 4A

I noticed that when I give an input voltage of around 3.33V, the output voltage spikes to 40+ volts and I don't understand why.

I get that this is outside of the "optimal" range but why would it do this? When the voltage sink under 3V the output voltage simply decreases but just around this 3.33V point, it goes crazy high.

I was planning to use it to increase the output voltage of a solar panel plug into a MPPT board which minimum input voltage is 6V, but without some kind of over-voltage protection I'm worried it will just fry my board...

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    \$\begingroup\$ 1. Show your circuit diagram. 2. Show your oscilloscope trace (if you used an oscilloscope) \$\endgroup\$ – user253751 Nov 27 '20 at 13:38

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