Author Topic: MAX4081  (Read 632 times)

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Offline majdghTopic starter

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MAX4081
« on: June 11, 2020, 10:04:05 am »
Hello,
I have a question about the Chip MAX4081 gain of 5, I choosed a reference voltage to be 3V for 0.5A full range, so to output will be +-1.5, which in my case at 0A the output will be 1.5V and at 500mA will be 3V and with -0.5A will be 0V BUT:
if the load current for some reason is more than 500mA lest say 1A in one direction so will i get a maximum of 3V at the output because the reference is 3V or will i get more?
the problem i couldn't find an answer form the datasheet, so i made a simulation in Multisim for the chip and i got more than 3V at 1A! so is it correct that even if the reference voltage is 3V at 500mA so i will get more voltage than 3V or the Multisim module has a problem! Thanks for the answer in advance.
 

Offline exe

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Re: MAX4081
« Reply #1 on: June 11, 2020, 11:34:55 am »
Didn't really dig deep, but looks like it can output more than the reference voltage. Look at Figure 3, the output is an inverting amplifier. So, I guess, maximum output can be close to supply pin.

Also, check this in the datasheet:

> [...] voltage at the output pin (OUT) that swings above VREF voltage for positive-sense voltages and below VREF for negative-sense voltages. VOUT is equal to VREF when VSENSE is equal to zero.
 

Offline ekiyoha@gmail.com

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Re: MAX4081
« Reply #2 on: July 15, 2020, 09:08:18 pm »
Hello Majdgh,
I tried to reply your post about Rigol communication through RS-232 with Ultrascope, but because it is an old post, I was told to write a new topic about. Please check my post "Rigol DS1062C communication through RS-232 with Ultrascope", I just published. regards
 


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