How to Amplify 3Vpp Triangle Wave to 50-100Vpp—Transformer Not Working

I want to amplify a 3 Vpp triangle wave and i want to amplify it to 50-100 Vpp. i m using a transformer but its not giving any output.
Please tell me what can i do?

A transformer will not work. Instead of trying to amplify a triangle wave, why not generate a square wave of the required amplitude (which is much easier than getting a 50-100Vpp triangle wave) and then low-pass filter it with a simple LC network - which will need to be calculated based on the frequency of the required signal.

why the transformer will not work? I m generating triangle wave with arduino and i want to avoid RLC components because I want to do controller based work.

The reason is the voltage you want - 50 to 100Vp-p. A transformer will distort the output badly - so what you get will be more of a sine wave than anything else. And even if you find a transformer that does not distort it significantly, the required characteristics for it to do so will make it rather expensive. Note that since you are working with the o/p of an arduino board, the current capability of this will be rather limited and you will still need some sort of a power stage between this and the transformer.

Ah yes, Arduino can't source that much current. Using an LC network is rather tedious in my opinion because of its frequency response. I think the best solution is an active amplifier (active method, not a passive one like using a transformer).