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Old 3rd July 2014, 11:45 PM   #1
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Default irs2092 and different temperature of mosfet

Since some card has burned out I wanted to check the temperatures of various points. I noticed a strange thing: why the temperature of the two MOSFETs is very different? a mosfet to about 110 degrees and the other body to about 35 degrees.
The coil gets to about 45 degrees with all the power from 50 0 50.
The mosfets are 4227 Monto irfb23n20d while if the temperature rises to 110 degrees while the other one remains at 35 degrees.
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Old 4th July 2014, 12:02 AM   #2
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celsius temperature
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Old 4th July 2014, 03:15 PM   #3
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help me please!!!!
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Old 4th July 2014, 04:03 PM   #4
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can you elaborate more, very hard for us to get the real picture... which side is hotter is it the high side or lower side mosfet... can you provice schematic or photo
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Old 4th July 2014, 04:48 PM   #5
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mosfet connected to pin 11 of irs2092
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Old 5th July 2014, 11:20 PM   #6
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Could be a problem with the high side power supply causing the mosfet to go into the linear region.
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Old 6th July 2014, 12:08 AM   #7
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reducing the frequency get these temperatures:
low side MOSFET 70 degrees, the high side mosfet always 30, inductance 50 degrees.
Is this normal? for the mosfet where can i see?
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Old 6th July 2014, 12:10 AM   #8
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mosfet normally must have the same temperature?
roughly what?
in the project there are no resistors on the gate of the mosfet ... what do you think?
I did a test to add, but the problem of the temperature difference remains.
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Old 6th July 2014, 12:13 AM   #9
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The temperatures should be the same.
What have you set the dead time to ?
Too short a dead time will heat up the mosfets.
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Old 6th July 2014, 12:17 AM   #10
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10k +10k for dead time.
I did try to use the same values ​​of 3.3 + 8.2 datasheet but the temperature does not change. reducing the resistance of the PWM frequency the temperature drops a lot. of defual there are two capacitors from 1000nF and the resistor 360. putting a resistor 170 the temperature from 110-120 drops to 80. with 120 ohms the temperature drops to 60-70 (the other mosfet always 30)
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