DRV88471中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Dual H-bridge motor driver

– Single or dual-brushed DC motors

– One bipolar stepper motor

– Solenoid loads

? 2.7-V to 18-V operating voltage range

? High output current per H-bridge

– 1-A RMS driver current at TA = 25°C

– 2-A RMS driver current in parallel mode at TA =

25°C

? Low on-state resistance at VM > 5-V

– 1000 mΩ RDS(ON) (HS + LS) at TA = 25°C

? Multiple control interface options

– 4-Pin interface

– 2-Pin interface

– Parallel bridge interface

– Independent bridge interface

? Current regulation with 20-μs fixed off-time

? Torque scalar for scaling output current to 50%

? Supports 1.8-V, 3.3-V, 5-V logic inputs

? Low-power sleep mode

– 1.7-μA Sleep mode supply current at VVM = 12-

V, TA = 25°C

? I2C Device Variant Available (DRV8847S)

– Detailed diagnostics on I2C registers

– Multi-slave operation support

– Supports standard and fast I2C mode

? Small packages and footprints

– 16 Pin TSSOP (no thermal pad)

– 16 Pin HTSSOP PowerPAD? package

– 16 Pin WQFN thermal package

? Built-in protection features

– VM undervoltage lockout

– Overcurrent protection

– Open load detection

– Thermal shutdown

– Fault condition indication pin (nFAULT)

2 Applications

? Refrigerator damper and ice maker

? Washers, dryers and dishwashers

? Electronic point-of-sale (ePOS) printers

? Stage lighting equipment

? Miniature circuit breakers and smart meters

3 Description

The DRV8847 device is a dual H-bridge motor driver

for industrial applications, home appliances, ePOS

printers, and other mechatronic applications. This

device can be used for driving two DC motors, a

bipolar stepper motor, or other loads such as relays.

A simple PWM interface allows an easy interface with

the controller. The DRV8847 device operates off a

single power supply and supports a wide input supply

range from 2.7 to 18 V.

The output stage of the driver consists of N-channel

power MOSFETs configured as two full H-bridges to

drive motor windings or four independent half bridges

(in an independent bridge interface). A fixed off time

controls the peak current in the bridge which can drive

a 1-A load (2-A in parallel mode with proper heat

sinking, at 25°C TA).

A low-power sleep mode is provided to achieve a

low quiescent current draw by shutting down much

of the internal circuitry. Additionally, a torque scalar is

provided which dynamically scales the output current

through a digital input pin. This feature lets the

controller decrease the current required for lower

power consumption.

Internal protection functions are provided for

undervoltage-lockout, overcurrent protection on each

FET, short circuit protection, open-load detection, and

overtemperature. Fault conditions are indicated by the

nFAULT pin. The I2C device variant (DRV8847S) has

detailed diagnostics.