ADuM3190 increase output voltage in LTSpice

Hello,

As you are using a buffer configuration, the input range of pin +IN is the same as the input common-mode range of the op. amp. From the datasheet, this is: 0.35 V to 1.5 V. Therefore, by injecting >2.5 V in pin IN+ the input range would be exceeded, which is not recommended. Furthermore, whereas EAOUT2 is an open-drain output specified to work with a pull-up resistor, EAOUT is not, so a pull-up resistor is not recommended for use with EAOUT. When using EAOUT2 pin the datasheet specifies the typical working range of 0.3 V to 5.4 V, for your supply voltage VDD1=15 V. An 8 V input would cause to exceed this range.

Looking at your simulation: EAOUT and EAOUT2 clamp at 2.6 V and 6.8 V respectively when the volage on COMP and IN+ is 2.6V. This is consistent with the gains specified on the datasheet, respectively: 0.9 to 1.1 from COMP to EAOUT2, and 2.34 to 2.86 from EAOUT to EAOUT2. Therefore, there is no indication of error from the LTSpice model.

Regards,

Juan Carlos

Hello,

Thanks for the clarification, then I will have to adapt to the input range.

Best Regards

Hey Carlos , did you resolve the problem ? I am using your simulation for a +Vin=48V ! Thank you