DRV8234中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

1 Features

? N-channel H-bridge brushed DC motor driver

? 4.5V to 38V operating supply voltage range

? Integrated Voltage and Speed regulation

? Soft-Start and Stop feature for inrush current

protection

? 600mΩ RDS(on) (High-Side + Low-Side)

? High output current capability: 3.7A Peak, 2A RMS

? PWM with I2C control interface

– Configuration and diagnostics on I2C registers

– Multi-follower operation support

– Supports standard and fast I2C mode

? Supports 3.3V, and 5V logic inputs

? Integrated current sensing and current regulation

? Analog current sense output (IPROPI)

? Internal charge pump with 100 duty cycle

? Long battery life with low-power sleep mode

– < 1μA maximum sleep current

? Small package and footprint

– 16-Pin WQFN with PowerPAD?, 3 × 3mm

? Integrated protection features

– VM undervoltage lockout (UVLO)

– Overcurrent protection (OCP)

– Thermal shutdown (TSD)

– Stall detection

– Overvoltage protection (OVP)

2 Applications

? Printers

? Vacuum Robots

? Washers and Dryers

? Coffee Machines

? POS Printers

? Electronic Hospital bed and bed control

? Fitness Machine

3 Description

The DRV8235 is a high-performance integrated Hbridge

motor driver with integrated speed regulation

along with additional integrated features like stall

detection, current sense output, current regulation,

and protection circuitry.

The integrated speed and voltage regulation feature

uses the motor voltage and current information to

regulate motor speed or voltage eliminating the

potential need for external sensors to detect speed.

This reduces board size and design complexity,

and saves on overall system cost. Integrated speed

regulation is used to maintain constant motor speed

over varying input supply voltages which minimizes

current consumption and saves power over time. This

is critical in applications that have different loading

conditions or rely on battery power for operation

where the input voltage is not constant. Soft-start and

stop allows for a controlled turn-on and turn-off time,

reducing large inrush currents to protect the motor

windings from damage, thereby increasing system

reliability and longevity.

An internal current mirror implements current sensing

and regulation. This eliminates the need for a large

power shunt resistor, saving board area and reducing

system cost. The IPROPI current sense output allows

a microcontroller to detect motor stall or changes in

load conditions. Using the VREF pin, this device can

regulate the motor current during startup and highload

events without interaction from a microcontroller.

The device supports sensorless motor stall detection

and reporting to microcontroller.