DRV8256: PWM Drive chip heating but no Temperature fault

HI TI,

My question is regarding the chips Thermal Fault output. When driving the chip with PWM, in any direction, the chip is getting hot and not latching the thermal fault. The output driving current seems to degrade as the chip temperature increases. When the PWM duty cycle decreased the chip quickly cools down.  How should the response of the fault output be at the different error states?

Thanks,

Cristian Espinoza