Datasheet for the UC1834-SP mentions the Fault Alert Output current as 2-5 mA. Request confirmation that this is the maximum output sink current of this section.
Thanks
Nandha
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Datasheet for the UC1834-SP mentions the Fault Alert Output current as 2-5 mA. Request confirmation that this is the maximum output sink current of this section.
Thanks
Nandha
Hey Nandha,
The maximum output current is listed in the ABS MAX table as 15 mA.
Thanks,
Daniel
So any design in which the Fault alert pin sinks a current of 10mA is fine and reliable?
Hey Nandha,
You are correct.
Are you seeing something different?
Thanks,
Daniel
Hi,
The fault current is fine. I was looking to find the temperature rise for a linear regulator application. The specifications are Input (23-25V), Output (20.3V, 200mA). Circuit is configured using an external PMOS element. When circuit is operated under no load, I see an quiescent current of 10mA (against max mentioned value of 7mA). Is this normal? Also the datasheet doesn't mention the thermal metrics (A note is given though 'Consult Packaging section of Databook for thermal limitations and considerations of package') Please provide the mentioned databook. Can I use the generic value for CDIP-16 package of 104°C/W (Junction to ambient thermal resistance)?
You can take the conversation offline if you feel the need.
Thanks
Hey Nandha,
The standby current you should be seeing is 7 mAs max, so something may be up.
This part is old enough that I don't believe thermals were done for it. I can submit it for thermal characterization if needed.
I am more worried about the 10 mA of standby current you are seeing.
Thanks,
Daniel
HI Daniel,
I've re-looked the circuit. The sink pin (pin 12) is drawing 3.5mA current. This reduces the quiescent current to 6.5mA. Hoping that this is within the datasheet parameters. In the meanwhile, could you get the IC thermally characterized
Thanks,
Nandha
Hey Nandha,
Which package are you using?
I need this to figure out the thermals.
Thanks,
Daniel
Hey Nandha,
I was able to dig up previous information.
Below are the results:
Thanks,
Daniel