  4U 1543-47 underwent its brightest outburst in 2021 after two decades of
inactivity. During its decay phase, AstroSat conducted nine observations of the
source spanning from July $1^{st}$ to September $26^{th}$, 2021. The first
three observations were performed with an offset of 40 arcmin with
AstroSat/LAXPC, while the remaining six were on-axis observations. In this
report, we present a comprehensive spectral analysis of the source as it was in
the High/Soft state during the entire observation period. The source exhibited
a disk-dominated spectra with a weak high-energy tail (power-law index
$\geq2.5$) and a high inner disk temperature ($\sim$0.84 keV). Modelling the
disk continuum with non-relativistic and relativistic models, we find inner
radius to be significantly truncated at $>$$10~R_g$. Alternatively, to model
the spectral evolution with the assumption that the inner disk is at the ISCO,
it is necessary to introduce variation in the spectral hardening in the range
$\sim$1.5-1.9.
