Hey,
Recently put my F6 back in a system to test prior to a potential sale. I’m using an ir thermometer to check mosfet temps and can’t recall what it should be. It also relates to bias setting iirc. Jog an old guy’s memory, please
Recently put my F6 back in a system to test prior to a potential sale. I’m using an ir thermometer to check mosfet temps and can’t recall what it should be. It also relates to bias setting iirc. Jog an old guy’s memory, please
Remember the 3 rules of maximum bias… stop when you reach any of these -
Heatsink of 55C and/or Transistor pin 2 65C
Total bias , both channels, (in watts) of no more than 1/2 the power transformer’s VA
1/2 the maximum dissipation (in watts) of the output device. In the case of the IRFP240, it’s a 150W device, so no more than 75W. (Which is really, really hot…)
Generally, you will reach the 65C limit of the transistor before anything else.
In F6, set about 0.6v - 0.7v over the 0.47R resistor. that will give you about 1.3A bias.
Heatsink of 55C and/or Transistor pin 2 65C
Total bias , both channels, (in watts) of no more than 1/2 the power transformer’s VA
1/2 the maximum dissipation (in watts) of the output device. In the case of the IRFP240, it’s a 150W device, so no more than 75W. (Which is really, really hot…)
Generally, you will reach the 65C limit of the transistor before anything else.
In F6, set about 0.6v - 0.7v over the 0.47R resistor. that will give you about 1.3A bias.
3 second hand on heat sink rule....
What happen to the old mantra? 🤔