Hi AdamWhat do you mean cascade them? Do you mean connect them together? Can you tell us a bit more about your circuit and what it does. Post the schematics you have here also.
Adam
this h bridge is used to shift the output voltage on bot positive and negative). This is a power up converter and I have also tried to connect the output of dc to dc converter to positive supply of h-bridge but I didn't any output.Is the DC boost convertor suppose to power up the H-Bridge? If so then just connect the output of the DC to DC to the positive supply rail of the H-Bridge. What is the H-Bridge doing, you haven't said or is it secret MI5 stuff? Also I can't see any feedback, you should have some to control the voltage on the output.
Adam