  Dc magnetic measurements across the charge ordering (CO) transition
temperature (T$_{CO}$) in polycrystalline
Pr$_{0.5}$Ca$_{0.5}$Mn$_{0.975}$Al$_{0.025}$O$_3$ have been performed under
simultaneous influence of external hydrostatic pressure (P) and magnetic field
(H). We show the first experimental evidence that the melting of charge order
instability obey an interesting scaling function, $\delta$T$_{CO}$/P$^\alpha$ =
$f$(H/P$^\beta$) in H-P-T landscape, where $\delta$T$_{CO}$ is the suppression
of T$_{CO}$ by P and H. Corresponding values of the exponents, $\alpha$ = 1.63
and $\beta$ = 0.33 have been extracted from data collapsing phenomena. Possible
origin of such a scaling behavior has been discussed.
