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Gate Driver ICs Forum Discussions

The_BOOM
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about the IR2153D.

On the datasheet there's a chart called "IR2153 RT vs Frequency". It shows frequency as high as 1 MHz.

But the table called "Electrical Characteristics" says "Oscillator frequency: Max: 106 kHz".

So what's the max frequency?

Thanks
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Srivatsa
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They are arbitrary examples used to test at close to 100 kHz switching frequency.

Isolated gate drivers can go to 1 MHz, level-shift gate drivers are limited to around 300 kHz to 500 kHz as level shift losses dominate at higher frequencies leading to higher thermal / power dissipation.

See the below application note which describes the different loss mechanisms inside a gate driver:

http://www.infineon.com/dgdl/Infineon-Advantages_of_high-voltage_GD_ICs-ApplicationNotes-v02_00-EN.p...

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Srivatsa
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The Electrical Characteristics table provides the test condition for the Max. Oscillator Frequency as Ct = 1 nF and Rt = 7.43 kΩ giving 106 kHz. For the minimum recommended values of Ct = 330 pF and Rt = 10 kΩ , the maximum oscillator frequency can be 1 MHz.

You can look at the below application notes on the working of IR2153D.

1. http://www.infineon.com/dgdl/dt98-4.pdf?fileId=5546d46254e133b401554de8f0885e14
2.http://www.infineon.com/dgdl/dt98-1.pdf?fileId=5546d46254e133b401554de8ed5d5e0f
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The_BOOM
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Thx for that!
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The_BOOM
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is there a special importance for Ct = 1 nF and Rt = 7.43 kΩ ? Is this a recommended values? Or just arbitrary example?

i don't see Max Frequency in Infineon Gate Drivers parametric search. Does that mean all devices have same Max Frequency of 1 MHz?

thx
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Srivatsa
Moderator
Moderator 5 sign-ins 50 replies posted 25 solutions authored
Moderator
They are arbitrary examples used to test at close to 100 kHz switching frequency.

Isolated gate drivers can go to 1 MHz, level-shift gate drivers are limited to around 300 kHz to 500 kHz as level shift losses dominate at higher frequencies leading to higher thermal / power dissipation.

See the below application note which describes the different loss mechanisms inside a gate driver:

http://www.infineon.com/dgdl/Infineon-Advantages_of_high-voltage_GD_ICs-ApplicationNotes-v02_00-EN.p...
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