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Your MOSFET is upside down.HobbyCNC said:The lower gate drivers (T3/T4) are connected to +12V, the VMOTOR is 24V.
I try this design in order to avoid use of dedicated mosfet drivers like HIP4081 or IR2112, they are difficult to find and little bit expensive for my pocket.
I think that Styx have found the problem, the upper mosfet do not switch correctly and also is very slow , so I revise my design.
As drawn in your original schematic, the lower gates will only go to about 4.3V, and that transition will be slow due to the series 10k resistor. Have you changed the design?HobbyCNC said:The lower gate drivers (T3/T4) are connected to +12V
The IRFZ44N is not even guaranteed to be on at 3.6V. The one you have may be on, but MOSFETs' threshold voltages vary widely, even for different units of the same part number. You need to consult the datasheet if you want to make a design that will work reliably with any given part. Vgs(to)=4V max, and that's at only 1ma!. Rds(on) is specified at Vgs=10V.addyismad said:irfz44n turn on at about 3.6v and not 5v....
The diodes are used to reduce or eliminate crossover distortion in linear audio amplifiers.mstechca said:I think that maybe a diode (or even 2 in series) should be between the transistor pairs whose bases are directly connected to each other.
HobbyCNC said:Hey all,
this is the new schema and it works !
Thanks to all for help !!
Lorenzo
tivoi said:how many speed of PWM you can use for this shecma
HobbyCNC said:tivoi said:how many speed of PWM you can use for this shecma
I have tested with 20kHz and it works great :wink:
Lnz