Time steps for random generator in simulink

I am using a repeating sequence to generate a triangle wave for PWM in Simulink.

In specifying the time values for the repeating sequence, when I use values such as: [0 0.00005 0.0001] (corresponding to a 10kHz waveform), the waveform looks fine.

When I use a smaller time value of: [0 0.000005 0.00001] (corresponding to a 100kHz waveform), the waveform looks all distorted.

How can I "set" the timestep in the simulation, so that the triangle wave is not distorted?

Answer 1

[Azzi Abdelmalek]

In model configuration parameter, choose your solver type to fixed step, and just below set your your fundamental sample time. http://www.mathworks.com/help/simulink/ug/choosing-a-solver.html#f11-41982