Why does AN57 include the open loop gain of the TL431 in the feedback equation, whereas AND8334 from onsemi does not include it? (AND8334 page 5)
评论
The TL431 is a rather poor excuse for an opamp, with an open loop gain of only around 55-60dB., therefore, the error term will be larger than with a "real" opamp, hence the inclusion of the open loop gain in equation 23.
The TL431 is a rather poor excuse for an opamp, with an open loop gain of only around 55-60dB., therefore, the error term will be larger than with a "real" opamp, hence the inclusion of the open loop gain in equation 23.