Why is Two Transistor forward snubber so villified?

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cupoftea

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Hi,
Why is it that the attached output diode snubber (.PNG and LTspice) for the two transistor forward is so villified?
Its just a basic RCD clamp style snubber, and even recycles some of the snubber energy back
to the output.

 

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  • 2TF_LT1243.zip
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The RCD snubber dissipates the energy stored in the leakage inductance as heat through the resistor. This is often seen as inefficient.
 
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Aah - the harsh realities of the classic fwd converter, turn on the fets too fast and you slap high dv/dt onto D1, then at fet turn off, D2 suffers.
 
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