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SN75453B: High-level output voltage

Jejomar Ildefonso
Genius 9090 points
Part Number: SN75453B

Hi Team,

From our understanding, the output stage on Figure 4 of the SN75453B datasheet is given by the open collector configuration which is tied to a reference voltage VS. However, the high level output voltage of the device is computed as VS – 6.5, in terms of mV.

Is the 6.5 value should be interpreted as mV? Or the high-level output voltage should be interpreted as V?

In addition, how do we accurately compute for the high level output voltage of the device? Our customer wants a high-level output voltage of 10V.

We would really appreciate your help.


Kind Regards,

Jejomar

  • 0
    TI__Genius 10855 points

    Hi Jejomar, 

    Thanks for reaching out on E2E!

    To clarify, you're asking what the voltage on the "Output" would be when the SN75453B is activated? Since this device is a low side switch, it will pull the "output" low when the device is enabled. Therefore the high level voltage will be the drop across the pass FET, or 6.5mV as you mentioned. 

    You can calculate the output voltage by looking at Figure 1 in the datasheet. Depending on the load current from your upstream load, this will create a IC (collector current). This will bias the FET and create a VCE threshold that would appear at the output of the FET. 

    Thanks,

    Arthur Huang