Jul 10, 2021
06:00 AM
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Jul 10, 2021
06:00 AM
Hello friends,
I have little confusion while designing the controller board for mosfets.
I am using 3 x IRS21867S 4A Source/Sink Gate drivers with 6 mosfets (brushless driver). How much current would be needed for this IC's regulator?
12V 1Ampere regulator would be enough? Or should we use 12A (4A x 3) regulators? That peak currents are used by bootstrap capacitor or voltage regulator's bulk capacitors?
For this uncertainty I am usually trying to use highest current output regulators but I guess not much true. What can happen if I use 100mA regulator? At past when I used low current regulators I saw some unhealthy problems at drivers.
Regards
I have little confusion while designing the controller board for mosfets.
I am using 3 x IRS21867S 4A Source/Sink Gate drivers with 6 mosfets (brushless driver). How much current would be needed for this IC's regulator?
12V 1Ampere regulator would be enough? Or should we use 12A (4A x 3) regulators? That peak currents are used by bootstrap capacitor or voltage regulator's bulk capacitors?
For this uncertainty I am usually trying to use highest current output regulators but I guess not much true. What can happen if I use 100mA regulator? At past when I used low current regulators I saw some unhealthy problems at drivers.
Regards
Solved! Go to Solution.
- Tags:
- IFX
1 Solution
Jul 12, 2021
01:59 AM
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Jul 12, 2021
01:59 AM
Hi,
The total current required by the gate driver circuit can be calculated as follows,
Total Power or the driver power, Pdrive= ((Qg*Fsw) + Iqd) * Vg
where,
Qg = gate charge of the MOSFET used for this application
Fsw = switching frequency
Iqd = Quiescent current (for both Vbs and Vcc )
Vg = Drive voltage.
For quiescent current values, please refer to the below image,
Current required by the IC's regulator, I = Pdrive/Vg.
After calculating the total current multiply it by 3 so that we can arrive at the total current.
Please refer to the following app note for more details,
https://www.infineon.com/dgdl/Infineon-Use_Gate_Charge_to_Design_the_Gate_Drive_Circuit_for_Power_MO...
Please let me know if this explanation has helped you in selecting the right regulator for your application.
Regards,
Abhilash P
The total current required by the gate driver circuit can be calculated as follows,
Total Power or the driver power, Pdrive= ((Qg*Fsw) + Iqd) * Vg
where,
Qg = gate charge of the MOSFET used for this application
Fsw = switching frequency
Iqd = Quiescent current (for both Vbs and Vcc )
Vg = Drive voltage.
For quiescent current values, please refer to the below image,
Current required by the IC's regulator, I = Pdrive/Vg.
After calculating the total current multiply it by 3 so that we can arrive at the total current.
Please refer to the following app note for more details,
https://www.infineon.com/dgdl/Infineon-Use_Gate_Charge_to_Design_the_Gate_Drive_Circuit_for_Power_MO...
Please let me know if this explanation has helped you in selecting the right regulator for your application.
Regards,
Abhilash P
1 Reply
Jul 12, 2021
01:59 AM
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Jul 12, 2021
01:59 AM
Hi,
The total current required by the gate driver circuit can be calculated as follows,
Total Power or the driver power, Pdrive= ((Qg*Fsw) + Iqd) * Vg
where,
Qg = gate charge of the MOSFET used for this application
Fsw = switching frequency
Iqd = Quiescent current (for both Vbs and Vcc )
Vg = Drive voltage.
For quiescent current values, please refer to the below image,
Current required by the IC's regulator, I = Pdrive/Vg.
After calculating the total current multiply it by 3 so that we can arrive at the total current.
Please refer to the following app note for more details,
https://www.infineon.com/dgdl/Infineon-Use_Gate_Charge_to_Design_the_Gate_Drive_Circuit_for_Power_MO...
Please let me know if this explanation has helped you in selecting the right regulator for your application.
Regards,
Abhilash P
The total current required by the gate driver circuit can be calculated as follows,
Total Power or the driver power, Pdrive= ((Qg*Fsw) + Iqd) * Vg
where,
Qg = gate charge of the MOSFET used for this application
Fsw = switching frequency
Iqd = Quiescent current (for both Vbs and Vcc )
Vg = Drive voltage.
For quiescent current values, please refer to the below image,
Current required by the IC's regulator, I = Pdrive/Vg.
After calculating the total current multiply it by 3 so that we can arrive at the total current.
Please refer to the following app note for more details,
https://www.infineon.com/dgdl/Infineon-Use_Gate_Charge_to_Design_the_Gate_Drive_Circuit_for_Power_MO...
Please let me know if this explanation has helped you in selecting the right regulator for your application.
Regards,
Abhilash P