DRV8845中文资料德州仪器数据手册PDF规格书

1 Features

• Integrates four H-bridges

• Can drive different configurations -

– Two stepper motors

– Four brushed-DC motors

– Three brushed-DC motors

– One stepper and two brushed-DC motors

– One stepper and one brushed-DC motor

• Footprint and software compatible with similar

drivers from other vendors

• 4.5-V to 38-V Operating supply voltage range

• Low RDS(ON): 900 mΩ HS + LS at 24 V, 25°C

• 1.5-A full-scale current Per Bridge

• Industry standard PHASE/Ixx Interface

• Synchronous rectification

• Full, 1/2 and 1/4 step operation for stepper motors

• Forward, reverse and coast modes for DC motors

• Smart tune decay for smooth and quiet operation

• Supports 3.3 V and 5 V logic inputs

• Protection features

– VM undervoltage lockout (UVLO)

– Charge pump undervoltage (CPUV)

– Overcurrent protection (OCP)

– Thermal shutdown (OTSD)

2 Applications

• IP Network Camera

• Brushed DC Motors

• Printers and scanners

• Medical Applications

• ATMs, currency counters, and EPOS

• Office and home automation

• Major and small home appliances

3 Description

The DRV8845 is a quad full-bridge driver for a wide

variety of industrial applications. The device can be

used for driving up to two stepper motors or up to

four brushed-DC motors. Each full-bridge output is

rated up to 1.5 A and 38 V. The DRV8845 includes

pulse width modulation (PWM) current regulators,

along with 2- bit nonlinear DACs (digital-to-analog

converters) that allow stepper motors to be controlled

in full, half, and quarter steps; and DC motors in

forward, reverse, and coast modes.

The PWM current regulator uses the smart tune

decay mode for motor audible noise and vibration

reduction, increased accuracy, and reduced power

dissipation. Internal synchronous rectification control

circuitry is provided to improve power dissipation

during PWM operation.

Protection features include thermal shutdown with

hysteresis (OTSD), undervoltage lockout (UVLO)

and overcurrent protection (OCP). Special power up

sequencing is not required.

The DRV8845 is supplied in a 6 mm x 6 mm, 36 pin

QFN package with exposed pad for enhanced thermal

performance.