I want to use an UC2526 for my project, but I dont understand how to calculate the gain/transconductance of the error amplifier section of this chip. The datasheet states that the open loop gain is 72dB and that is has an output impedance of 2M, what does this translate to in transconductance?
One way I have tried to think about this is by assuming that 72dB (4000) is a voltage gain, thus 1V input will give 4000V at the output, with 2M output impedance which gives 2mA output current into a short, thus gM=dI/dV = 2ms. Is this the way to do it? Does this mean that the transconductance changes with the output voltage?
/Daniel
One way I have tried to think about this is by assuming that 72dB (4000) is a voltage gain, thus 1V input will give 4000V at the output, with 2M output impedance which gives 2mA output current into a short, thus gM=dI/dV = 2ms. Is this the way to do it? Does this mean that the transconductance changes with the output voltage?
/Daniel