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IRF4905 datasheetIRF 3205 Datasheeet

Hi to all,

I am working on a 24-volt BLDC 3ph drive application. I have made this design with a basic understanding of p and n channel MOSFET. In this design, MOSFET gate pulse is in voltage range of 18-20 volt. I am quite confused about choosing the correct value gate resistor. I came to know that it must be within 20-50 ohm. I applied many combinations but still, the problem lies the same as the previous one.

I also came to know that may be a dead band is not quite enough that will make MOSFET hotter so I changed it accordingly. From 1us to 3.2us. But still no change in temperature.

please be noted that gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching sch. Of it.

Kindly give me suggestion regarding this and tell me what precautions should be taken in this schematics.

Thanks

N channel: IRF3205 P channel: IRF4905 Driver asic A4963 Allegro

IRF4905 datasheetIRF 3205 Datasheeet

I am working on a 24-volt BLDC 3ph drive application.

I have made this design with a basic understanding of p and n channel MOSFET.

In this design, MOSFET gate pulse is in voltage range of 18-20 volt.

I am quite confused about choosing the correct value gate resistor. I found that it must be within 20-50 ohm. I applied many combinations but still, the problem lies the same as the previous one.

I also found that maybe the dead band is not quite enough that will make MOSFET hotter so I changed it accordingly. From 1us to 3.2us. But still no change in temperature.

Please note that the gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching schematic of it.

What can I do to reduce the heating?

• N channel: IRF3205
• P channel: IRF4905
• Driver asic A4963 Allegro

enter link description here

Hi to all,

I am working on a 24-volt BLDC 3ph drive application. I have made this design with a basic understanding of p and n channel MOSFET. In this design, MOSFET gate pulse is in voltage range of 18-20 volt. I am quite confused about choosing the correct value gate resistor. I came to know that it must be within 20-50 ohm. I applied many combinations but still, the problem lies the same as the previous one.

I also came to know that may be a dead band is not quite enough that will make MOSFET hotter so I changed it accordingly. From 1us to 3.2us. But still no change in temperature.

please be noted that gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching sch. Of it.

Kindly give me suggestion regarding this and tell me what precautions should be taken in this schematics.

Thanks

N channel: IRF3205 P channel: IRF4905 Driver asic A4963 Allegro

IRF4905 datasheetIRF 3205 Datasheeet

Hi to all,

I am working on a 24-volt BLDC 3ph drive application. I have made this design with a basic understanding of p and n channel MOSFET. In this design, MOSFET gate pulse is in voltage range of 18-20 volt. I am quite confused about choosing the correct value gate resistor. I came to know that it must be within 20-50 ohm. I applied many combinations but still, the problem lies the same as the previous one.

I also came to know that may be a dead band is not quite enough that will make MOSFET hotter so I changed it accordingly. From 1us to 3.2us. But still no change in temperature.

please be noted that gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching sch. Of it.

Kindly give me suggestion regarding this and tell me what precautions should be taken in this schematics.

Thanks

N channel: IRF3205 P channel: IRF4905 Driver asic A4963 Allegro

Hi to all,

I am working on 24 volt BLDC 3ph drive application. I have made this design with basic understanding of p and n channel MOSFET. In this design, MOSFET gate pulse is in voltage range of 18-20 volt. I am quite confuse about choosing correct value gate resistor. I came to know that it must be within 20-50 ohm. I applied many combination but still problem lies same as previous one.

I also came to know that may be dead band is not quite enough that will make MOSFET hotter so i changed it accordingly. From 1us to 3.2us. But still no change in temperature.

please be noted that gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching sch. Of it.

Kindly give me suggestion regarding this and tell me that what precautions should be taken in this schematics.

Thanks

N channel: IRF3205 P channel: IRF4905 Driver asic A4963 Allegro

enter link description here

Hi to all,

I am working on a 24-volt BLDC 3ph drive application. I have made this design with a basic understanding of p and n channel MOSFET. In this design, MOSFET gate pulse is in voltage range of 18-20 volt. I am quite confused about choosing the correct value gate resistor. I came to know that it must be within 20-50 ohm. I applied many combinations but still, the problem lies the same as the previous one.

I also came to know that may be a dead band is not quite enough that will make MOSFET hotter so I changed it accordingly. From 1us to 3.2us. But still no change in temperature.

please be noted that gate pulse is coming from the Allegro based BLDC driver A4963. I am also attaching sch. Of it.

Kindly give me suggestion regarding this and tell me what precautions should be taken in this schematics.

Thanks

N channel: IRF3205 P channel: IRF4905 Driver asic A4963 Allegro