  We consider the mixed inflaton-curvaton scenario in which quantum
fluctuations of the curvaton field during inflation lead to a relatively large
curvature perturbation spectrum at small scales. We use the model of chaotic
inflation with quadratic potential including supergravity corrections leading
to a large positive tilt in the power spectrum of the curvaton field. The model
is characterized by the strongly inhomogeneous curvaton field in the Universe
and large non-Gaussianity of curvature perturbations at small scales. We
obtained the constraints on the model parameters considering the process of
primordial black hole (PBH) production in radiation era.
