I have problems with the NCP3065. Something with the circuit is wrong - probably the sizing of the elements. I used their design tool, but unfortunately the circuit doesn't work as expected.
My scenario is the following:
I use the controller in boost mode. The minimal Vin is 10V and the output voltage is 30V. I need around 250mA @ 30V as output parameters. I've attached the final calculations the Excel file made for me. The inductor I used is 330uH.
What happens when I run the circuit - the current the IC draws is around 1A (limited by the Rs resistor) and gets very hot in a few seconds. I think that the IC pulls down the MOSFET so that the inductor gets charged, but doesn't return from that state so the inductor gets discharged by the LED connected to the output?
Any suggestions and ideas are appreciated.
My scenario is the following:
I use the controller in boost mode. The minimal Vin is 10V and the output voltage is 30V. I need around 250mA @ 30V as output parameters. I've attached the final calculations the Excel file made for me. The inductor I used is 330uH.
What happens when I run the circuit - the current the IC draws is around 1A (limited by the Rs resistor) and gets very hot in a few seconds. I think that the IC pulls down the MOSFET so that the inductor gets charged, but doesn't return from that state so the inductor gets discharged by the LED connected to the output?
Any suggestions and ideas are appreciated.
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