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Why does the output 12V square wave always burn Q2?

Hardware design
February 1, 2021 by Tomi 39

I use this circuit to output a 12V square wave. Why does it always burn Q2? Why is this circuit unreasonable? Please help me analyze it, thank you.

All Comments

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Aurelius Posted on February 1, 2021

The upper and lower tubes may be turned on at the same time.

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Kennan Posted on February 1, 2021

It is caused by the heavy load, and it is necessary to not replace the mid-power transistor.

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Phyllis Posted on February 1, 2021

The transistor is burnt out due to insufficient drive current. The transistor drive resistance is 10K. Assuming that the drive voltage is 12V at the initial resistance, 12V/10K=1.2mA, assuming that the transistor magnification is 100 times (not achieved under power conditions), that is 120mA, in the case of insufficient drive, the transistor is in a linear amplification state, and the power consumption is large. When the control frequency is high, the MOS also requires current and burns out due to heat.

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