Hi
Can LM2575 generate -24V DC signal if I use the adjustable version as an inverting switcher, I had read the datasheet but I can't figure if it is possible or not, in the datasheet it is written that it is possible to use the 12V output version in an inverting mode to generate -12V from the output, is it possible to do the same thing for the adjustable one? thank you for helping.
Datasheet:http://www.mouser.com/ds/2/405/lm2575-n-405736.pdf

 

Hi

Yes. The computation of the component values is basically the same.
The difference is in the output topology.

 

Look at figures 32 and 33 in the datasheet

 

Hi
Can LM2575 generate -24V DC signal if I use the adjustable version as an inverting switcher, I had read the datasheet but I can't figure if it is possible or not, in the datasheet it is written that it is possible to use the 12V output version in an inverting mode to generate -12V from the output, is it possible to do the same thing for the adjustable one? thank you for helping.
Datasheet:http://www.mouser.com/ds/2/405/lm2575-n-405736.pdf

Petkan:
Yes, any Buck regulator could be re-configured as Buck Boost and produce negative output voltage.
The whole circuit stays the same with the following exceptions:
The GND node of LM2575 (with all connected parts) is freed from GND and re-assigned as negative output
The output of LM2575 is grounded.

Note that the circuit is powered from the sum of input and output voltage. No harm clamping the negative to GND with a diode, to prevent it from going positive (>0.8V). The fly-wheeling diode of the Buck may act in this role...but via the inductor.