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Part Number: REF3033
Hello,
1. is there a way to increase current drive by adding an external transistor? if yes, please recommend the circuit
2. IS there any alternate part which is similar with increased current drive in smaller packages
Hi Mohammed
Regrads
Trailokya
Just to be on same page, what I'm expecting is this.
My requirement :I have added new circuitry, new controller in my board. Since REF3033 had output current rating of 25mA, I wanted to increase it by adding an external circuitry. is there a way to do so? if yes, please guide on the circuit.
What you're suggesting is to use a buffer, can you guide me to a part which can give me some idea to follow through.
Hi Mohammed
You can look into OPAx310 part. It has 150mA drive capability and have good offset tempdrift and noise. Please add it in non inverting buffer config and this should work.
Regards
Trailokya
Ok Got it.
Couple of questions:
1. Do i need to add any resistors at the input terminals of opamp ?
2.
what this statement means? my circuit has bulk capacitances.
3. Also, since REF3033 does not sink current, Will it have any impact on bias currents flowing from OPA, i'm just making an absurd statement as it just crossed my mind, Do we have to focus in this area?
Below configuration should work
Where you can add around 10-20 ohms Riso for stability with load cap.
Regards
Trailokya
1. How to add a pulse current load (to emulate a microcontroller response) in the above file.
2. How to check the response of the output to see overshoot, and other stuff, i mean what analysis to run? please do explain in brief and plot it in simulation file above
please guide...
Hi Mohammed
You can add a resistor (based on your load condition) with a fuction gerenaror and give a pulse of 0 to 3.3V. This will tell you the trasient behaviro of the device -
Regards
Trailokya
1. Hello, can you help me with the transient response in the simulation file attached. Please Set the timing and analysis so that i can observe.
3v3_supply - autosave 23-01-06 01_02.TSC
OPA310 doesn't seem to be available anywhere.
2. Can you suggest an equivalent opamp or a better opamp which is available?
3. Also, can i use LMV861MG/NOPB? What are the impacts
Hi Mohammed
Here is your file.
10 ohm seriese resistor may give you huge swing in the output .
I am transfering this to amplifier forum , they will suggest you correct opamp.
Hi Amp experts
We need a buffer which can support upto 100mA load swing for 50uF capacitor with good accuracy. Can you please suggest some opamp.
Regards
Trailokya
Hi Mohammed,
I'm seeing on TI.com we do have a lot of OPA310 stock. Are you looking on TI.com?
Best Regards,
Robert Clifton
Our outsource partner buys from mouser / Digi key.
Questions:
1. As per Trailokya's post above, we need a buffer which can support up to 100mA load swing for 50uF capacitor with good accuracy. So is there a part which can perform this requirement or are suggesting OPA itself will do the work
2. Also, if you are suggesting an alternate part, suggest a part which can be procured through mouser / Digi key.
Hi Mohammed,
While I will continue to recommend OPA310 when it gets stocked, since it's the newest and has the best specs, I think the TLV341 would be a good alternative, though it's right at the edge of the 100mA requirement. The LMV861 would likely be another good fit in this application and have more output current margin than the TLV341.
Best Regards,
Robert Clifton