Iawia
Member
Hi,
I purchased a few L165 Power Op Amps recently. I am having difficulty getting them to work. Looking at the datasheet, I see that there is an option for 'unity gain' and another option for gain > 10. I am a bit confused. The unity gain works fine, as I hooked it up just as the schematic says, without a +- supply (I don't see any place for pins 3 & 5 on their schematic for unity gain). To get a gain, I figured I'd changed the feedback resistor to 31k and the input resistor to 10k, set the +-12v on the appropriate pins, but I fully rail to -10v when my input is 1v. If the gain is 3.1v, I should have 3.1v on my output.
What is happening? Is there another schematic for gain 1 < K < 10?
Specs:
Op amp L165
Supply -12v, +12v (pins 3 & 5 respectively)
input voltage 1v
R2 31k, R1 10k
Application: To control a motor up to 3 Amps from a 12 v supply. Or alternatively, if someone can offer a better op amp? However, I still would like to know why this is not working.
I purchased a few L165 Power Op Amps recently. I am having difficulty getting them to work. Looking at the datasheet, I see that there is an option for 'unity gain' and another option for gain > 10. I am a bit confused. The unity gain works fine, as I hooked it up just as the schematic says, without a +- supply (I don't see any place for pins 3 & 5 on their schematic for unity gain). To get a gain, I figured I'd changed the feedback resistor to 31k and the input resistor to 10k, set the +-12v on the appropriate pins, but I fully rail to -10v when my input is 1v. If the gain is 3.1v, I should have 3.1v on my output.
What is happening? Is there another schematic for gain 1 < K < 10?
Specs:
Op amp L165
Supply -12v, +12v (pins 3 & 5 respectively)
input voltage 1v
R2 31k, R1 10k
Application: To control a motor up to 3 Amps from a 12 v supply. Or alternatively, if someone can offer a better op amp? However, I still would like to know why this is not working.