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Gate Driver ICs Forum Discussions

User19408
Level 1
Level 1
I'm going to use IRS2011 to dirve IRF250P225. I see the in the typical diagram in IRS2011 datasheet,how can I determine the capacitor and diode type in the diagram ,is there any other diagram recommended circuit for the dive IC, thank you.

4215.attach
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1 Solution
Srivatsa
Moderator
Moderator 5 sign-ins 50 replies posted 25 solutions authored
Moderator
Few general guidelines:

1. Capacitor on Vcc should be atleast 10 times capacitor on VB. Say Vcc cap = 10 uF, VB cap = 1 uF. This will ensure the bootstrap capacitor gets charged during transients.
2. Both Vcc and VB capacitors should be ceramic type. If electrolytic type needs to be used, add a small ceramic cap about 10 nF in parallel to the electrolytic type.
3. Both these capacitors need to be close to the gate driver IC.
4. Based on the switching frequency and duty cycle, VB cap can be of low value, 10 nF or so.
4. A small resistor, about 2.2 ohms to 10 ohms needs to be in series with the bootstrap diode.
5. A fast recovery diode or Schottky diode with low forward voltage drop and low junction capacitance is recommended. Its voltage rating should be greater than the DC link voltage.

For a deeper understanding you can review the below application notes:

https://www.infineon.com/dgdl/Infineon-Using_Monolithic_Voltage_Gate_Drivers-AN-v01_00-EN.pdf?fileId...

https://www.infineon.com/dgdl/Infineon-HV_Floating_MOS_Gate_Drivers-ApplicationNotes-v01_00-EN.pdf?f...

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4 Replies
Emanuel
Employee
10 solutions authored 5 solutions authored First solution authored
Employee
Hi and welcome to the forum.
The capacitor selection is circuit and modulation dependent. The capacitor will provide a floating power supply to the upper switch when it conducts while it will be charged when the lower switch turns on.
We have a really detailed application note about bootstrap circuit design HERE.
Please let us know if this answers all of your questions.
Best regards,
Emanuel
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Srivatsa
Moderator
Moderator 5 sign-ins 50 replies posted 25 solutions authored
Moderator
Few general guidelines:

1. Capacitor on Vcc should be atleast 10 times capacitor on VB. Say Vcc cap = 10 uF, VB cap = 1 uF. This will ensure the bootstrap capacitor gets charged during transients.
2. Both Vcc and VB capacitors should be ceramic type. If electrolytic type needs to be used, add a small ceramic cap about 10 nF in parallel to the electrolytic type.
3. Both these capacitors need to be close to the gate driver IC.
4. Based on the switching frequency and duty cycle, VB cap can be of low value, 10 nF or so.
4. A small resistor, about 2.2 ohms to 10 ohms needs to be in series with the bootstrap diode.
5. A fast recovery diode or Schottky diode with low forward voltage drop and low junction capacitance is recommended. Its voltage rating should be greater than the DC link voltage.

For a deeper understanding you can review the below application notes:

https://www.infineon.com/dgdl/Infineon-Using_Monolithic_Voltage_Gate_Drivers-AN-v01_00-EN.pdf?fileId...

https://www.infineon.com/dgdl/Infineon-HV_Floating_MOS_Gate_Drivers-ApplicationNotes-v01_00-EN.pdf?f...
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User20928
Level 1
Level 1
Hi srivatsa,

Can we use IRS2011(S) in place LM25101C...when we replace this it is not working directly in place of ti part working pcb.

Regards
Hari
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Emanuel
Employee
10 solutions authored 5 solutions authored First solution authored
Employee
Hi Hari,

could you post the gate driver section of you schematic?
What supply voltage are you using?
are you using a boostrap circuit for the high-side or a separate power supply?
How are you driving the driving the gate driver and with what voltage?
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