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Gate Driver ICs Forum Discussions

mdantonio
Level 1
First reply posted First question asked Welcome!
Level 1

Hi,

Is there any way to increase the discharge current to decrease the circuit dead-time? This IC is almost perfect for our application but high 3rd quadrant device losses are hold us back. Otherwise, we will require use an additional IC to detect soft-switching and initiate the next switching state. The frequency range of the IC is excellent but 350 ns fixed dead-time is simply too much at high frequency. 

Best,

Michael D'Antonio

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1 Solution
Abhilash_P
Moderator
Moderator 25 likes received 250 replies posted 250 sign-ins
Moderator

Hi , 

    Thank you for posting on the Infineon Community.

I understand that you are looking to reduce the dead time of the IC, ICE1HS01G.

Unfortunately this cannot be done with fixed operating frequency as this dead time depends on the discharge capability of capacitor Cfs which is internal to the IC.

The internal oscillator block of IC is as shown below,

Abhilash_P_0-1648810084444.png

The Ichg depends on 4 currents, Ichg_min, ISS, Ifb and Ics. 

The frequency depends on the charge current which inturn depends on Rfmin resistance. 

The Ton and frequency dependency can be understood from the following equations,

Abhilash_P_1-1648810638687.png

The Idisc path is internal to IC and cannot be changed. 

The Frequency of operation is determined with Ich_min which inturn influences Ichg. Hence Td is fixed for this IC with a constant current path. 

 

Regards,

Abhilash P

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Abhilash_P
Moderator
Moderator 25 likes received 250 replies posted 250 sign-ins
Moderator

Hi , 

    Thank you for posting on the Infineon Community.

I understand that you are looking to reduce the dead time of the IC, ICE1HS01G.

Unfortunately this cannot be done with fixed operating frequency as this dead time depends on the discharge capability of capacitor Cfs which is internal to the IC.

The internal oscillator block of IC is as shown below,

Abhilash_P_0-1648810084444.png

The Ichg depends on 4 currents, Ichg_min, ISS, Ifb and Ics. 

The frequency depends on the charge current which inturn depends on Rfmin resistance. 

The Ton and frequency dependency can be understood from the following equations,

Abhilash_P_1-1648810638687.png

The Idisc path is internal to IC and cannot be changed. 

The Frequency of operation is determined with Ich_min which inturn influences Ichg. Hence Td is fixed for this IC with a constant current path. 

 

Regards,

Abhilash P

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mdantonio
Level 1
First reply posted First question asked Welcome!
Level 1

Hi Abhilash,

 

This was as I expected. Do you have any suggestions for alternate implementations with additional external ICs to enable reduced dead-time? 

 

Best,

 

Michael D'Antonio

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Abhilash_P
Moderator
Moderator 25 likes received 250 replies posted 250 sign-ins
Moderator

Hi,

   As you can see from the below block diagram, the discharge path is internal to IC and no external components can be connected,

Abhilash_P_0-1649137368771.png

 

One thing we can do is to vary the minimum charging current which inturn varies the Ichg and thereby reduces/ varies both frequency and duty. ( as duty depends on the charging current). 

 

Regards,

Abhilash P

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