Hi,
If HA210N06 is getting hot, then you didn't drive it correctly.
It should not even need a heatsink when driven correctly.
Sadly your schematic does not show how you drive the gate...thus we can not validate it.
Did you read the Mosfet datasheet?
Klaus
If you will mix up drain and source, all current will pass throuhg the internal diode and thus it can warm up also
Hi,
Two options:
* use a Mosfet working with low V_gs, also called "logic level Mosfet"
* or use a gate driver that is able to drive 10V gate voltage
Klaus
.... or add a small NPN bipolar transistor as a MOSFET driver. Emitter to ground, drive the base from the PIC through a suitable current limiting resistor (~100 Ohms) and connect it's collector to the gate of the MOSFET. Also add a pull-up resistor (~470 Ohms) to the collector/gate junction to 12V. That should let the bipolar transistor saturate when the PWM signal is high, taking the gate to near zero volts and let the gate go to 12V when the PWM signal is low. It is only two more components but it lets you keep the existing MOSFET.
Brian.
IRLZ24, IRLZ44
These are logic level MOSFETs
I use these for LED lighting regulation, my main working light is approx 75W which at 100% duty gives ~6,2A
Even at 500Hz you might not be able to fully drive the MOSFET from a PIC output. The maximum current the PIC can drive is 20mA and even at that current it may not reach the required voltage to ensure full MOSFET conduction.
Please try what I suggested in post #7.
Brian.
I disagree.....
To protect the MOSFET if the input is left floating, add a 100K resistor from the base of the NPN transistor to the +12V line, not to ground.
If the base is pulled low, the MOSFET conducts which is exactly the opposite of what you need in a fail-safe condition.
Brian.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?