DRV8848PWPRG4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/Dual Brushed DC

– Stepper

? 4 to 18V Operating Supply Voltage Range

? Low ON-resistance: HS + LS = 900mΩ (Typical,

25°C)

? PWM Control Interface

? Optional Current Regulation With 20μs Fixed

Off-Time

? High Output Current per H-Bridge

– 2A Maximum Driver Current at 12V and

TA = 25°C

– Parallel Mode Available Capable of 4A

Maximum Driver Current at 12V and

TA = 25°C

? Low-Current 3μA Sleep Mode

? Thermally-Enhanced Surface Mount Package

? Protection Features

– VM Undervoltage Lockout (UVLO)

– Overcurrent Protection (OCP)

– Thermal Shutdown (TSD)

– Fault Condition Indication Pin (nFAULT)

2 Applications

? Appliances

? General Brushed and Stepper Motors

? Printers

3 Description

The DRV8848 provides a dual H-bridge motor

driver for home appliances and other mechatronic

applications. The device can be used to drive one

or two DC motors, a bipolar stepper motor, or other

loads. A simple PWM interface allows easy interfacing

with controller circuits.

The output block of each H-bridge driver consists

of N-channel and P-channel power MOSFETs

configured as full H-bridges to drive the motor

windings. Each H-bridge includes circuitry to regulate

the winding current using a fixed off-time chopping

scheme. The DRV8848 is capable of driving up to

2A of current from each output or 4A of current in

parallel mode (with proper heat sinking, at 12V and TA

= 25°C).

A low-power sleep mode is provided, which shuts

down internal circuitry to achieve very-low quiescent

current draw. This sleep mode can be set using a

dedicated nSLEEP pin.

Internal protection functions are provided for UVLO,

OCP, short-circuit protection and overtemperature.

Fault conditions are indicated by a nFAULT pin.