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

1 Features

? N-channel H-bridge brushed DC motor driver

? 4.5-V to 38-V operating supply voltage range

? Ripple counting feature for:

– On-chip Speed and Position detection

– Integrated Voltage and Speed regulation

? Soft-Start and Stop feature for inrush current

protection

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

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

RMS

? PWM with I2C control interface

– Configuration and diagnostics on I2C registers

– Multi-follower operation support

– Supports standard and fast I2C mode

? Supports 3.3-V, and 5-V 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

– < 1 μA maximum sleep current

? Small package and footprint

– 16-Pin WQFN with PowerPAD?, 3 × 3 mm

? 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 DRV8234 is a high-performance integrated Hbridge

motor driver with integrated speed and position

detection using ripple counting along with additional

features like motor speed and voltage regulation, stall

detection, current sense output, current regulation,

and protection circuitry.

The integrated ripple counting algorithm counts the

number of ripples in the motor current to determine

motor relative position and speed eliminating the

potential need for encoders, hall sensors, or optical

sensors. This reduces board space 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.