Hello i have TLC271 with single supply of 10V with a load of 2K.
My question is on the datasheet it the Output Voltages are for resistors 10k,100k,1MΩ.
How can i find the Voltage Output Swing of TLC271 with 2kΩ resistor Load.

 

hi,
This is the same type of question you are asking in your other thread.
https://forum.allaboutcircuits.com/threads/lmc662-voltage-output-swing-vs-load.153021/

Do you ever solve that problem and post your answer.?

E

 

Yes i did posted it

 

Yes i did posted it

hi M,
We are keen to help you, but I do not see a numerical answer to the question in that thread.
What is the Vout maximum at 12V with a 2k load.?

E

 

hi M,
We are keen to help you, but I do not see a numerical answer to the question in that thread.
What is the Vout maximum at 12V with a 2k load.?

E

Vo(max)=11.712V

 

hi M,
Thats close enough.
Which calculation method did you use.
E

 

hi M,
Thats close enough.
Which calculation method did you use.
E

I used linear equation.

 

OK.
Where on the datasheet did you see the 10k,100k and 1meg Vout max values.??
E

 

OK.
Where on the datasheet did you see the 10k,100k and 1meg Vout max values.??
E
View attachment 161562

If you keep scrolling down you will see them the 10KΩ,100ΚΩ,1ΜΩ.

 

hi,
Found that OK, I don't use the tlc271.
It appears that there are 3 Modes of operation, the Mode seems to effect the OPA output impedance which makes it difficult to calculate the output resistance.

Which OPA mode is the question stating.?

I would assume High Bias Mode ie: 10k Load Vout value.
E

 

hi,
Found that OK, I don't use the tlc271.
It appears that there are 3 Modes of operation, the Mode seems to effect the OPA output impedance which makes it difficult to calculate the output resistance.

Which OPA mode is the question stating.?
E

i am using High Bias Mode.

 

hi,
You can see I have added the High Bias Mode to my post #10.
Use the Vout typical of 8.5v with a 10V supply and a 10k load , calculate the OPA output resistance .
Do you know how to do that.?
E

 

hi,
You can see I have added the High Bias Mode to my post #10.
Use the Vout typical of 8.5v with a 10V supply and a 10k load , calculate the OPA output resistance .
Do you know how to do that.?
E

No it's the first time im hearing it.

 

OK,
Most OPA's have an internal resistance, which is determined by design and the components used.
This means that when a external load is connected the current flowing in the load also flows thru the internal output resistance path.

This current flowing thru the internal output resistance causes a voltage drop at the output pin.
So in your question and datasheet, with a 10v supply and an external 10k load the voltage out is only 8.5v, so 1.5v has been dropped across the OPA's internal output resistance.
From that description you should be able to calculate the internal resistance..
Can you do that.?
E

EDIT:
May I ask what course work this question is based on.?

 

OK,
Most OPA's have an internal resistance, which is determined by design and the components used.
This means that when a external load is connected the current flowing in the load also flows thru the internal output resistance path.

This current flowing thru the internal output resistance causes a voltage drop at the output pin.
So in your question and datasheet, with a 10v supply and an external 10k load the voltage out is only 8.5v, so 1.5v has been dropped across the OPA's internal output resistance.
From that description you should be able to calculate the internal resistance..
Can you do that.?
E

EDIT:
May I ask what course work this question is based on.?

If i am not wrong the maximum Output Current Io=30mA and voltage drop on the internal resistor is 1.5v so the resistor should be Rout=50Ω

 

hi,
With a10k load and a 8.5Vout , thats I= 8.5v/10k = 850uA
With a 10v supply and only 8.5v out, it is losing 1.5v at 850uA, Zo [output resistance] = 1.5v/850uA = 1764R.

Show me how you got the Zo= 50R and the 30mA [ don't forget you have to use the known values from the datasheet 10V, 10k, 8.5v]

EDIT:
May I ask what course work this question is based on.?

 

hi,
With a10k load and a 8.5Vout , thats I= 8.5v/10k = 850uA
With a 10v supply and only 8.5v out, it is losing 1.5v at 850uA, Zo [output resistance] = 1.5v/850uA = 1764R.

Show me how you got the Zo= 50R and the 30mA [ don't forget you have to use the known values from the datasheet 10V, 10k, 8.5v]

EDIT:
May I ask what course work this question is based on.?

I found the Zo=50Ω from saying we have 1.5v drop on the internal resistor and i took from datasheet from maximum ratings(page 5)the maximum output current which is Io=30mA.
For a homework we have a circuit with single supply and we are using TLC271 with a load of 2KΩ.
We are trying to find the voltage output swing with 2kΩ load and that's why i made this thread.

 

I found the Zo=50Ω from saying we have 1.5v drop on the internal resistor and i took from datasheet from maximum ratings(page 5)the maximum output current which is Io=30mA.

hi M,
The OPA is not sourcing a 30mA with a 10k load and a 10v supply.
As I said calculate the output current for 8.5v across a 10k load. post #16.
E

 

hi M,
The OPA is not sourcing a 30mA with a 10k load and a 10v supply.
As I said calculate the output current for 8.5v across a 10k load. post #16.
E

I understood that part.

 

hi M,
So what do you make the out impedance with a 10v supply, 10k load and Vout = 8.5v.?