  The energies and widths of $DNN$ quasi-bound states with isospin I=1/2 are
evaluated in two methods, the fixed center approximation to the Faddeev
equation and the variational method approach to the effective one-channel
Hamiltonian. The $DN$ interactions are constructed so that they dynamically
generate the $\Lambda_c(2595)$ (I=0, $J^{\pi} =1/2^-$) resonance state. We find
that the system is bound by about 250 MeV from the $DNN$ threshold, $\sqrt{s}
\sim 3500$ MeV. Its width including both the mesonic decay and the $D$
absorption, is estimated to be about 20-40 MeV. The I=0 $DN$ pair in the $DNN$
system is found to form a cluster that is similar to the $\Lambda_c(2595)$.
