Hello All,
I'm trying to create a MOSFET h-bridge using the same design I had success with using TIP127 and TIP122 transistors. I thought I would be able to plug in my new IRF9460 and IRF530 in place but I'm finding that this is not working as I thought.
When using the TIP127, it drives my motor with 12V SLA battery with no heat and no noticable power loss (PWM working fine).
However, when I exchange the TIP127 with a IRF9640, it heats up to the point where I can't touch it (> 150 degrees) and seems to be driving the motor at a lower power level...and slows down as MOSFET heats up.
I'm driving the P-Channel (IRF9640) Mosfet with an NPN transistor to Ground (See schematic).
The N-Channel IRF530 has no heat and seems to be working perfectly. Does anyone have any suggestions (ie resistor combinations or logic drivers) to keep my MOSFETS safe?
Many thanks.
I'm trying to create a MOSFET h-bridge using the same design I had success with using TIP127 and TIP122 transistors. I thought I would be able to plug in my new IRF9460 and IRF530 in place but I'm finding that this is not working as I thought.
When using the TIP127, it drives my motor with 12V SLA battery with no heat and no noticable power loss (PWM working fine).
However, when I exchange the TIP127 with a IRF9640, it heats up to the point where I can't touch it (> 150 degrees) and seems to be driving the motor at a lower power level...and slows down as MOSFET heats up.
I'm driving the P-Channel (IRF9640) Mosfet with an NPN transistor to Ground (See schematic).
The N-Channel IRF530 has no heat and seems to be working perfectly. Does anyone have any suggestions (ie resistor combinations or logic drivers) to keep my MOSFETS safe?
Many thanks.
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