Hi Team
1. Can you show the functional block diagram of TLV8544?
2. How much of the output drive capacity of TLV8544?
Thanks!
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Hi Team
1. Can you show the functional block diagram of TLV8544?
2. How much of the output drive capacity of TLV8544?
Thanks!
Hello Harry,
1) The functional block diagram is a triangle rotated 90 degrees; the symbol for a op amp. The input and output stages are CMOS; gates for input and drains for outputs.
2) The electrical characteristics tables specify 100k load behaviors. At 3.3V supply this 16.5uA. Typical results can be seen in data sheet figures 12 to 15.
Hi Harry,
the functional block diagrams in the latest datasheets are usually highly simplified and not very helpful. This was highly different many decades ago when the manufacturers hadn't to struggle with product piracy yet.
What do you hope to see in the functional block diagram?
Kai
Hi Kai
Understand.
Customer wanna know the output stage, they found the output will impact the power supply and input stage, if there are any routes internal will cause this? like a protection diode or others.
Hey Harry,
There are CMRR and PSRR curves available in the datasheet (Figure 10 and 11).
There are also available trainings for both on ti.com:
Please let us know if you need a schematic review.
All the best,
Carolina
Harry,
It is common practice to connect sources to back gates for FETs. That means VOUT voltage that is outside the supply power rails will pass current (diode action) from drain to back gate (which is shorted to source). Output voltage usually gets back to input though the external passive resistors in the feedback network (the resistor(s) you put there)
Hi Clemens
As the picture you showed.
if there is a overload add in Vo, will the power supply voltage V+ be pulled down through the upper Mos?
Hi Harry,
please explain how and why an overload is added at Vo in your application.
If the output voltage can exceed the supply voltage you should add a Schottky diode clamp from the output pin to the supply voltage pin and a current limiting resistor in series to the output of OPAmp to limit the current through the Schottky diode.
Keep in mind that now a reverse current can flow into the supply voltage line. So either your supply voltage can absorb this reverse current or you should stop any reverse current by adding a diode in series to the supply voltage line.
Kai