  We study a class of N=1 Supergravity inflationary models in which the
evolution of the inflaton dynamics is controlled by a single power in the
inflaton field at the point where the observed density fluctuations are
produced, in the context of the braneworld scenario, in light of WMAP results.
In particular, we find that the bounds on the spectral index and its running
constrain the parameter space both for models where the inflationary potential
is dominated by a quadratic term and by a cubic term in the inflaton field. We
also find that $\alpha_s>0$ is required for the quadratic model whereas
$\alpha_s<0 $ for the cubic model. Moreover, we have determined an upper bound
on the five-dimensional Planck scale, $M_5 \lsim 0.019$ M, for the quadratic
model. On the other hand, a running spectral index with $n_s>1$ on large scales
and $n_s<1$ on small scales is not possible in either case.
