Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I have never seen an opamp with a GBP of only 100kHz. Most are at least 1MHz. Audio opamps are 3MHz to 8MHz.
Power amplifiers are bridged, not opamps. Please post the schematic of what you want to do.
take a look at micro power opamps....they are often 100KHz or belowI have never seen an opamp with a GBP of only 100kHz. Most are at least 1MHz. Audio opamps are 3MHz to 8MHz.
Power amplifiers are bridged, not opamps. Please post the schematic of what you want to do.
The gain bandwidth product for the LM3886 power amplifier is typically 8MHz, not just 100kHz. It is tested at 100kHz.
You can bridge two of them if you add an offset voltage null trimpot then their power will be 136W into 8 ohms.
Oh my bad, You are right auduguru, I looked at the datasheets of LM3886 and LM3875 and you are right.
But another question with regard to this point is, if the gain is just 1 at 8MHz for these Audio power amplifiers then they should work just fine at frequencies beyond 20kHz? For instance the gain for LM3886 and LM3875 at 100kHz is 80. So do they work just fine and linear at Bandwidth of 100kHz bu the gain 80 or less? Or there is another factor to be considered?
I mean If in need an power amplifier at higher frequencies (for instance at 100kHz with the gain of 80 or at 1MHz with the gain of 8) in future then those chips are an option to be considered?
Note that the LM3886 is pretty useless at 8MHz because it has a gain of 1 at that frequency.
I haven't looked at the datasheet but I assume it probably starts to roll off at about 200kHz.