TB67H450 2CH DC Brushed Motor Drive Board

VREF
on board RS == 0.15R
I_LIMIT ≈ VREF / (3 × RS)
if Vref = 5V, I_LIMIT = 5 / (3 * 0.15) = 11.11A (theoretically), but max current capability of this chip is 3.5A
if Vref = 1.5V, I_LIMIT = 1.5 / (3 * 0.15) = 3.33A (preferable setup )
if Vref = 1V, I_LIMIT = 1 / (3 * 0.15) = 2.22A