Hi every one
I'm trying to build a dc-dc buck boost converter. the gate driver is IR2117. I connected the driver as the datasheet explained. the Vcc of the IR2117 is 15V is connected to pin 1. Pin 2 is connected to PWM(50% duty cycle). Pin 3 is the ground of both Vcc and PWM. Pin7 is connected to the gate of the MOSFET while pin 6 is connected to the source of the MOSFET. The neutral from the output resisnace is aslo connected to the pin 3 of the gate driver. by this connection I could obtain a DC output. I surprised that with changing the output resistance, the DC output voltage is also changed. Is there a problem in my connection. Is there an isolation problem? can you help me please.
If you can help me please contact me on:
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Can you please post a complete schematic?

Are you using two different power supplies or only the 15V?
What's the drain voltage of the MOSFET?
What's the MOSFET?

 

Thank you very much for your replying

I use two different power supplies. 15V is used to drive IR2117 driver and 17V is the drain voltage. of the MOSFET. I use IRF3710 MOSFET. The PWM is generated using function geneator with 0.5 duty cycle and 10V logic. I want to say that the ground of the two power supplied( 15V and 17V) and the function generator have the same ground(pin 3 of the IRF2117).