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Old 11th March 2003, 08:47 PM   #11
Mad_K is offline Mad_K  Norway
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I depends on what load you are going to drive, and wether you are going to short the outputs.

I would use a 0,1 ohm for opa541am or a 0,15 ohm for opa541ap ina final design. Caddock MP930 looks good here...
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Old 4th July 2003, 10:19 AM   #12
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Quote:
Originally posted by pundip
Mad_K,
I am thinking about building an amp based on the opa541. What current limiting resistors did you use? Also does anyone know if the opa541's have thermal protection?

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Originally posted by Mad_K


Didn't use any Since this was only a test-setup...


Read the datasheet, it's all there

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Originally posted by pundip
Hi,
Are you going to be using current limit with your gc? I am not sure I should just short the limit pin to output out limit resitor

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Originally posted by Mad_K
I depends on what load you are going to drive, and wether you are going to short the outputs.

I would use a 0,1 ohm for opa541am or a 0,15 ohm for opa541ap ina final design. Caddock MP930 looks good here...

i am using the OPA541 and OPA549. im glad you found them good. i just shorted the current limiting pin to output on the OPA541, and to -v on the OPA549.
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Old 4th July 2003, 03:11 PM   #13
Mad_K is offline Mad_K  Norway
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I just left CL pin floating on my latest incarnation with opa541. Maybe I should tie it to the output instead

I'm not shure wether we are current limited at max, or if we now have no CL at all

Anyways, it sounds GOOD!
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Old 4th July 2003, 03:29 PM   #14
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the datasheet for the opa541 has very detailed instructions on how to calculate the current sensing resistor and its wattage requirement. check it out.
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Old 4th July 2003, 07:35 PM   #15
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Old 4th July 2003, 07:36 PM   #16
Mad_K is offline Mad_K  Norway
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Quote:
Originally posted by Mad_K


Didn't use any Since this was only a test-setup...


Read the datasheet, it's all there

Quote:
Originally posted by Mad_K
I depends on what load you are going to drive, and wether you are going to short the outputs.

I would use a 0,1 ohm for opa541am or a 0,15 ohm for opa541ap in a final design. Caddock MP930 looks good here...

Quote:
Originally posted by millwood
the datasheet for the opa541 has very detailed instructions on how to calculate the current sensing resistor and its wattage requirement. check it out.
Ahaaa

Where does it say wether you are current limited or not if you use 0 ohm CLR?
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Old 4th July 2003, 10:21 PM   #17
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Originally posted by Mad_K
Where does it say wether you are current limited or not if you use 0 ohm CLR?
the answer critically depends on the voltage drop off the zero ohm CLR,
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Old 4th July 2003, 10:31 PM   #18
Mad_K is offline Mad_K  Norway
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Originally posted by Mad_K








Ahaaa

Where does it say wether you are current limited or not if you use 0 ohm CLR?

-found it here:

http://www-s.ti.com/sc/psheets/sboa057/sboa057.pdf

(table 1)

CLR=0 Ohm -> CL=10A (peak)


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Old 4th July 2003, 11:38 PM   #19
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the 10A limit is the internal limit on the output devices (that's how the amp is spec'd).

the limit on the positive and negative side is slightly different (about +/- 10%).
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Old 4th July 2003, 11:47 PM   #20
Mad_K is offline Mad_K  Norway
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That's what I figure too. I guess it lets the smoke out when you draw more than that continously
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