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Current - LM336 vs. LM385 & TL072 vs. LT1013

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juz_ad

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In the schematic above, with the op-amps powered by +/-12V - how much current can be supplied by…

a) The LM336 2.5V VRef
b) An LM385 2.5V Vref
c) The TL072
d) An LT1013

Trying to work out if an LM385 with a LT1013 buffer is going to be an 'upgrade' over the LM336 buffered with a TL072.

Having a hard time finding that info via the data sheets. I thought the maximum current an op-amp can supply is the 'short-circuit current' - which I believe is approx. 40mA for the TL072?

Thanks in advance.
 

Audioguru

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Most opamp specs have a minimum, a typical and a maximum value. Each opamp is different even if they have the same part number and same manufacturer.
The datasheet for the TL072 shows
A graph shows the typical voltage loss with different load resistor values. With a +/-15V supply and a 200 ohms load resistance then the output voltage is typically only about 6.2V so the typical output current is 31mA. An IC with a weaker chip will be less.
With a +/-15V supply and a 2k ohms load resistance then the typical output voltage is about +12V so the typical output current is about 6mA.
 

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