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TINA-TI/LM5170-Q1: TINA TI simulation of LM5170-Q1; ISETA_DRIVER block

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Replies: 4

Views: 141

Part Number: LM5170-Q1

Tool/software: TINA-TI

Hello, I am currently using the LM5170-Q1 to test some simulations in TINA TI for a customer. I have however some questions regarding the TINA TI reference design given on the product page.

In the situation I am simulating, the LM5170 is used as a buck boost between high voltage (10V) and low voltage (4V) batteries. The TINA TI reference design uses however a block called ''ISETA_DRIVER" which seems to be a library of some sorts which was originally configured for 48 V Vin. I was wondering if this block needs to be altered in order for the new configuration that I presented to work properly, because at the moment I am slightly confused as to how the ISETA_DRIVER affects the results and I am not too experienced with the code used in it. Do I even have to change anything in the ISETA_DRIVER block at all or is it simply for monitoring certain values? At the moment I have been able to get a stable configuration already without changing said block.

Thank you.

  • Hi Assad,

    The engineer responsible for this part is currently out of office. He will be back by the week of the 28th.

    Thanks,

    Yinsong

  • In reply to Yinsong Cai1:

    Hi Assad,

    Mostly you don't need to modify it if I understand your question correctly.  However, I am not able to download the tsc file during my trip.  Can you send me a picture of what you referred to?   I will reply ASAP but please expect some delays due to my trip schedule.

    Thanks,

    Youhao

  • In reply to Youhao Xi:

    Hello Youhao,

    Thank you for responding while on a business trip. The part that I'm referring to is: 

    To further explain my problem: like I said in the description I'm trying to simulate this part as a buck boost from 10 V to 4 V (10 A total low voltage rail current), I have however trouble with getting a proper configuration, so I was wondering if some tweaking has to be done in this block. In buck mode I get a steady 4 V but in boost I cannot get it to 10 V but only to around 5.5 V. I have tried an inductor value of Lm1 = Lm2 = 11,45 uH and current sense resistor Rcs1 = Rcs2 = 10 mOhm (which I calculated from the datasheet and also the Excel design tool, switching freq = 100 kHz). In boost mode however I can only get it to 10 V by substantially decreasing the current sense resistors which is not possible because I need a single configuration for both modes. Hence my question if this block might be influencing my measurement results and how.

    I hope you can help me with this problem and I'm looking forward to your response.

  • In reply to Assad Bahari:

    The LM5170 does not have such a corresponding function block and there is relationship between these signals. So I believe it is used by the model creator to group some signals.  I don;t think you need to touch it in your simulation.

    Thanks,

    Youhao

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