Odp: [sdiy] OpAmp Output Current Question

[Roman]

I was surprised first, but you're right. I couldn't find such parameter
in TI or Motorola datasheet. But there is a nice graph showing
maximum peak voltage vs load resistance. It drops below 1k, so
we can assume usable output current is about 13mA.
At 100 ohms Motorola shows 5Vpp, so it's 25mA, Texas drops to 0
which is probably mistake. But at 200 ohms they say about +/-6.5V
so it's over 30mA! Strange...
But anyway, at 20mA poor TL072 will get hot.
Don't know what is your application, but I'd use something different,
or add transistor at output

Roman

----- Original Message ----- 
From: Scott Gravenhorst <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, January 10, 2004 7:02 PM
Subject: [sdiy] OpAmp Output Current Question


> I was looking at the spec sheet for a TL072 opamp today
> wanting to know what the device's maximum usable output
> current can be.  The only spec given is no-load supply
> current.  I need to be able to supply up to about 20ma.  Is
> this reasonable for a TL072 or should I choose a different part?
> 
> Thanks.
> 
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