Increases deadtime in IR2184 IC

Thread Starter

MrsssSu

Joined Sep 28, 2021
201
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This LT Spice circuit is recreated from the IR2184 datasheet on how to make a complementary PWM signal with dead time. However, the problem I am facing now is the PWM fed into the 2 mosfets as shown in the diagram above, the dead time between the 2 signals does not increase even if I increase the capacitance value highlighed above. May I know how to increase the deadtime between the 2 signals as shown. My LT SPice file is below to be downloaded.:)

Thank you and have a nice day:)
 

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Alec_t

Joined Sep 17, 2013
12,897
The boot-strap capacitor C1 does not determine dead-time. The IR2184 has a non-modifiable internally-provided 500nS dead-time.
You could use an alternative IC having separate Hin and Lin inputs to customise dead-time.
 

Ian0

Joined Aug 7, 2020
5,527
There is a version of the IR2184 called IR21844 that has a pin to control the deadtime.
The boostrap capacitor has no effect on the dead-time.
There are other ICs which can automatically adjust their dead-time, by waiting for the output waveform before switching the transistor. MIC4102 is an example, but it only works to 120V DC.
 

Thread Starter

MrsssSu

Joined Sep 28, 2021
201
There is a version of the IR2184 called IR21844 that has a pin to control the deadtime.
The boostrap capacitor has no effect on the dead-time.
There are other ICs which can automatically adjust their dead-time, by waiting for the output waveform before switching the transistor. MIC4102 is an example, but it only works to 120V DC.
Thank you Ian :)
 

Thread Starter

MrsssSu

Joined Sep 28, 2021
201
The boot-strap capacitor C1 does not determine dead-time. The IR2184 has a non-modifiable internally-provided 500nS dead-time.
You could use an alternative IC having separate Hin and Lin inputs to customise dead-time.
Thank you Alex :)
 
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