DRV8251数据手册开发板套件编程器的评估演示板及套件规格书PDF

描述 Description

The DRV8251 device is an integrated motor driver with N-channel H-bridge, charge pump, current regulation, and protection circuitry. The charge pump improves efficiency by supporting N-channel MOSFET half bridges and 100% duty cycle driving.

The DRV8251 implements a current regulation feature by comparing the analog input VREF and the voltage across a current-sense shunt resistor on the ISEN pin. The ability to limit current can significantly reduce large currents during motor startup and stall conditions.

A low-power sleep mode achieves ultra-low quiescent current draw by shutting down most of the internal circuitry. Internal protection features include supply undervoltage lockout, output overcurrent, and device overtemperature.

The DRV8251 is part of a family of devices which come in pin-to-pin, scalable RDS(on) and supply voltage options to support various loads and supply rails with minimal design changes. See Section 5 for information on the devices in this family. View the full portfolio of brushed motor drivers on ti.com.

特性 Features

• N-channel H-bridge brushed DC motor driver
• 4.5-V to 48-V operating supply voltage range
• Pin-to-pin, RDS(on), voltage, and current sense/regulation variants (external shunt resistor and integrated current mirror)
• DRV8870: 6.5-V to 45-V, 565-mΩ, shunt
• DRV8251: 4.5-V to 48-V, 450-mΩ, shunt
• DRV8251A: 4.5-V to 48-V, 450-mΩ, mirror
• DRV8231: 4.5-V to 33-V, 600-mΩ, shunt
• DRV8231A: 4.5-V to 33-V, 600-mΩ, mirror

• High output current capability: 4.1-A Peak
• PWM control interface
• Supports 1.8-V, 3.3-V, and 5-V logic inputs
• Integrated current regulation
• Low-power sleep mode
• VM = 24-V, TJ = 25°C

• Small package and footprint
• 8-Pin HSOP with PowerPAD™, 4.9 × 6.0 mm

• Integrated protection features
• VM undervoltage lockout (UVLO)
• Latched overcurrent protection (OCP)
• Thermal shutdown (TSD)