TMI8870B中文資料拓爾微電子數(shù)據(jù)手冊PDF規(guī)格書

FEATURES

? H-Bridge Motor Driver

Drives One DC Motor, One Winding of a Stepper

Motor, or Other Loads

? Wide 6.8V to 45V Operating Voltage

? 3.6-A Peak Current Drive

? PWM Control Interface

? Integrated Current Regulation

? Low-Power Sleep Mode

? VM Undervoltage Lockout (UVLO)

? Overcurrent Protection (OCP)

- Retry after OCP: TMI8870

- Latch after OCP: TMI8870B

? Thermal Shutdown (TSD)

? Automatic Fault Recovery

? ESOP8 Small Package and Footprint

APPLICATIONS

? Printers

? Appliances

? Industrial Equipment

? Other Mechatronics Applications

GENERAL DESCRIPTION

The TMI8870/B device are the brushed-DC motor

drivers for printers, appliances, industrial

equipment, and other small machines. Two logic

inputs control the H-bridge driver, which consists of

four N-channel MOSFETs that can control motors

bidirectionally with up to 3.6-A peak current. The

inputs can be pulse width modulated (PWM) to

control motor speed, using a choice of currentdecay modes. Setting both inputs slow enter a lowpower sleep mode.

The TMI8870/B devices feature integrated current

regulation, based on the analog input VREF and the

voltage on the ISEN pin, which is proportional to

motor current through an external sense resistor.

The ability to limit current to a known level can

significantly reduce the system power

requirements and bulk capacitance needed to

maintain stable voltage, especially for motor

startup and stall conditions.

The devices are fully protected from faults and

short circuits, including UVLO，OCP, and TSD.