This driver module can work under the PWM duty cycle of 0% -98%.
Recommend max working current(Load): 20A
Recommend power vcc(load) : 12V ~ 26V
Control VCC: 4V~12V
Control TTL voltage means the High voltage of the control pins (EN, LPWM, RPWM, DIS).
The stable max working current is 20A while the load Vcc is between 12V~30V. The current is restricted by heat dissipation. So if the current is over 20A, the heat may melt the soldering tin and cause problems. If you want it working stable at higher current, you should add a radiator.
Power VCC is recommended to be higher than 12V if your load is large-current devices. While over 12V, the MOSFET will be working fully and its power consumption is small. So the heat will be less. If your load current is not large and just several Amperes, the power VCC can be as low as 3V.