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LM5104 Tina-TI Model

Other Parts Discussed in Thread: TINA-TI, LM5104

The Tina-TI transient model is worthless; it only draws pictures of square waves. To be useful, a model should be able to drive MOSFETS in a circuit simulation. This can't really do anything useful.

Create useable Tina-TI models. There is no reason to encrypt a model unless the encryption is used to disguise how lame the model actually is.

  • Neil,

    Thanks for your comments. The LM5104 is a gate driver and the model is set up to drive FETs. I believe that you may not be pleased with the Reference Design chosen for the device, not the model itself.

    If you have a more appropriate reference design for the device, please let me know and I will see if we can use it instead of this particular design. We normally use the circuit specified by the design team or an EVM design. In this case, there is no EVM design available.

    I am sure that you are aware of the reasons for encryption of the power supply models. It seems to be an industry wide practice. As for hiding how lame the models are, I do not believe that TI encrypts for that reason.

    Britt

  • Britt;

    I'm not pleased with either the reference circuit or the model itself. As a "reference circuit" it does not really illustrate how the device is likely to be applied. I suggest you use the LM5104 model with a half-bridge made from two (IRFB4410, for example) N-ch MOSFETS. This circuit would illustrate something that is actually useful.

    Why does the circuit show Vdd source (V2) to be a square wave instead of a DC power supply? Who draws these things?

    If this TINA circuit is simulated, it works.....too well. There is something wrong with the boost circuit in the model; it shows proper operation at 100Hz switching rate with a boost capacitor (Cboot) of only 1pF. This is clearly impossible.

    While I'm at it, I'll complain about the LM5104 data sheet as well.-- a trifecta. The subject of calculating the proper size for the boost capacitor is completely overlooked. It is a shame that a TI customer has to consult a Fairchild or International Rectifier gate driver data sheet to find data on this important parameter.