AnsweredAssumed Answered

Enable pin on ADM7172

Question asked by Rob.Analog on Mar 3, 2015
Latest reply on Mar 4, 2015 by Rob.Analog

ADM7172 enable.png

 

Hello All,

I am designing the ADM7172 into my system. I have a few questions about the Enable pin.

 

1) The EN pin appears to need a step input. Do I need to put a diode etc in order to create this step event or can I just use the setup I use in the attached picture.

 

2)     Would you mind double checking that my math below is correct?

                                   Vin = [(Ren1 /Ren2)*1.2]+1.2

      Therefore with Ren1 = 130 kOhm and Ren2 = 47 kOhm then the ideal enable voltage will be set to 4.52 V correct?

                                       

                                   Hysteresis = [(Ren1 +Ren2)/Ren1]*100mV

     With Ren1 = 130 kOhm and Ren2 = 47 kOhm the hysteresis will equal to (1.36 * 100 mV) = 136 mV.

     Therefore the actual enable voltage will be equal to 4.52V + 136 mV = 4.656 V

     And the actual turn-off voltage will be equal to 4.52V - 136 mV = 4.384 V

 

3) One other unrelated question:

     Can I cascade one ADM7172  into another ADM7172  in the manner shown in the picture above.

 

Thanks and Regards,

Robert Hinchy

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