Conclusion

AN2653

20/22

6

Conclusion

Based on the results of the three compensation methods described in this application note,

it can be stated that the best compensation solution for the TS507 is the in-the-loop method.

This is the most complex solution to understand, but a pick-up table is provided in order to

choose the most appropriate components for your application. The main drawback of this

compensation method is a limited output swing.

The out-of-the-loop compensation method is easy to implement because it requires only

one extra component. The way it works is also easy to understand. However, its main

limitation is an inaccuracy on the output voltage because the load is part of a divider bridge.

An abacus is provided to choose the component you need for your application.

Finally, the snubber method is easy to understand and use. It does not have the drawbacks

of the first two solutions. But because the loop gain cannot be considered as a pure third-

order system (because of the open loop gain of the amplifier and the variations of the output

impedance which is not purely resistive and constant over frequency), it does not lead to

great improvements, and it is limited to load capacitors lower than 1 nF in the case of the

TS507. An abacus is also provided for this compensation method. Another drawback of this

solution is that it potentially limits the frequency range of the application for large output

signals due to a strong current flowing through the compensation elements. This

compensation method is not really useful for the TS507.

In conclusion, for the TS507, whenever possible, we recommend to use the in-the-loop

compensation method.

Note, that this document provides typical values for the TS507 at ambient temperature.

Therefore, your chosen solution must in any case be checked on bench.