Hi,
I've built an optocoupler circuit to isolate the control circuit from the power circuit.
1) The optocoupler circuit is built using 6N137.
2) The power circuit consists of a MOSFET driving a resistive load. The gate drive I used is IR2111.
The optocoupler circuit works well on its own. And the gate drive circuit also works well stand alone, i.e., i use the signal generator as input. However, when I connect the optocoupler output to the gate drive input, I am unable to switch on the MOSFET.
The input whether from the signal generator or optocoupler are the same and the I've checked; the ICs are ok.
I've attached a schematic of the circuit i use. I'm wondering whether it could be due to the bootstrap diode, IN4001 has a high trr. However, the circuit work on its own with this diode!!
I've also posted the datasheet for 6N137 and IR2111 (sorry for the size).
I am currently testing the circuit on breadboard.
Did I miss something?
Thanks
I've built an optocoupler circuit to isolate the control circuit from the power circuit.
1) The optocoupler circuit is built using 6N137.
2) The power circuit consists of a MOSFET driving a resistive load. The gate drive I used is IR2111.
The optocoupler circuit works well on its own. And the gate drive circuit also works well stand alone, i.e., i use the signal generator as input. However, when I connect the optocoupler output to the gate drive input, I am unable to switch on the MOSFET.
The input whether from the signal generator or optocoupler are the same and the I've checked; the ICs are ok.
I've attached a schematic of the circuit i use. I'm wondering whether it could be due to the bootstrap diode, IN4001 has a high trr. However, the circuit work on its own with this diode!!
I've also posted the datasheet for 6N137 and IR2111 (sorry for the size).
I am currently testing the circuit on breadboard.
Did I miss something?
Thanks
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