SLOSE50A April 2020 – June 2021
PRODUCTION DATA
The DRV8256E/P devices are brushed DC motor drivers that operate from 4.5 V to 48 V supporting a wide range of output load currents for various types of motors and loads. The devices integrate an H-bridge output power stage and a charge pump regulator to support more efficient high-side N-channel MOSFETs. The devices operate off a single power supply input (VM) which can be directly connected to a battery or DC voltage supply. The nSLEEP pin provides an ultra low power mode to minimize current draw during system inactivity.
The devices also integrate current sensing using current mirrors on the low-side power MOSFETs. The integrated current sensing allows the devices to limit the output current with a fixed off-time PWM chopping scheme. The integrated current sensing out performs traditional external shunt resistor sensing by removing the need for an external power shunt resistor. The off-time PWM current regulation level can be configured during motor operation through the VREF pin to limit the load current accordingly to the system demands. The current regulation is highly configurable, with several decay modes of operation. The PWM off-time, tOFF, can be adjusted to 7, 16, 24, or 32 μs.
A variety of integrated protection features protect the device in the case of a system fault. These include undervoltage lockout (UVLO), charge pump undervoltage (CPUV), overcurrent protection (OCP), and overtemperature shutdown (TSD). Fault conditions are indicated on the nFAULT pin.