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Output Voltage variation of SN6501-Q1

Other Parts Discussed in Thread: SN6501-Q1, ISO7242C-Q1

I would like to confirm the output voltage variation of SN6501-Q1.

In the datasheet figure 3, there is the characteristics of output voltage vs I load current with the transfomer made by Wurth Electronics.

In this figure, the curve of output voltage has the slope.

In this case, I have questions.

1. If the transformer is ideal, is the voltage stable at 5V?

    Is the cause of the slope the characteristics of the transformer?

2. How much is the gradient from 10mA to 30mA in Figure 3? 

3. The customer will use 5V to 5V with figure 33 (without LOD). They use it for the power supply of ISO7242C-Q1.

     Can they use this IC for the supply? I think it is difficult to use it because the output voltage has the variation with the characteristics

     of the transformer ( the variation of the turn ratio and the resistance, the themal characteristics of the transformer and so on).

Best regards,

Atsushi Yamauchi