原标题：Maxim MAX14871全桥DC马达驱动方案

　　Maxim公司的MAX14871是4.5V-36V全桥DC马达驱动器,高达2.8A峰值马达电流,低功耗(30kHz/24V时的电流1mA),开态总桥电阻334mΩ,30kHz/24V时的电流1mA,具有短路保护,热关断和欠压锁住,主要用在工业自动化,打印机和扫描仪,售货机和游戏机.本文介绍了MAX14871主要特性,框图,典型应用电路图以及全桥DC马达驱动板MAXREFDES89#主要特性,框图,电路图,材料清单和PCB设计图.

　　The MAX14871 DC motor driver provides a low-power and simple solution for driving and controlling brushed motors with voltages between 4.5V and 36V. Very low driver on resistance reduces power during dissipation.

　　The MAX14871 features a charge-pump-less design for reduced external components and low supply current. Integrated current regulation allows user-defined peak startup motor currents and requires minimal external components.

　　The MAX14871 includes 3 modes of current regulation: fast decay, slow decay, and 25% current ripple modes. Current regulation based on 25% ripple simplifies the design and enables regulation independent of motor characteristics. A separate voltage sense input(SNS) reduces current-sensing errors due to parasitic trace resistance.

　　The MAX14871 features shoot-through protection and internal free-wheeling diodes that absorb inductive motor currents. Driver outputs are short-circuit-protected from shorts to ground, to the supply, and between M1 and M2. An active-low FAULT output signals thermal overload and overcurrents during fault conditions.

　　The MAX14871 is available in a 16-pin TSSOP-EP package and operates over the -40℃ to +85℃ temperature range.

　　MAX14871主要特性：

　　Drive More Power and Reduce Footprint

　　Up to 2.8A Peak Motor-Current Package

　　Flexible 4.5V–36V Supply Enables Longer Runtime

　　Low Power Consumption Runs Cooler and Longer

　　334mΩ (typ) Total Bridge On-Resistance

　　1mA (typ) Supply Current at 30kHz/24V

　　10µA (max) Standby Current at 12V

　　Simplified Designs Reduces Time to Market

　　Charge-Pump-Less Architecture

　　Current Regulation Only Requires a Sense Resistor

　　Current-Sense Input Simplifies PCB Layout

　　Internal/External VREF for Current Regulation

　　Fast/Slow/25% Ripple Current Regulation Modes

　　Integrated Protection Provides Robust Driving Solutions

　　Short-Circuit-Protected Drivers

　　Thermal Shutdown Undervoltage Lockout

　　Diagnostic Active-Low FAULT Output

　　-40℃ to +85℃ Temperature Range

　　MAX14871应用:

　　Industrial Automation

　　Printers and scanners

　　Vending and Gaming Machines

　　图1.MAX14871框图

　　图2.MAX14871典型应用电路图

　　MAX14871全桥DC马达驱动板MAXREFDES89#

　　The MAXREFDES89# provides an ideal interface for anyone developing with brushed DC motors. The design is an mbed®-compatible, Arduino® form factor shield for the rapid development of brushed DC motor applications. The shield contains four MAX14871 full-bridge DC motor drivers for driving up to 4 motors. A MAX17501 DC-DC converter allows the system to operate from a single 7 to 36VDC power supply. Four MAX4704 4:1 multiplexers permit setting the current regulation mode of the MAX14871, while two MAX5387 digital potentiometers provide the ability to set the motor current limit. A MAX7300 GPIO expander supports interfacing each motor driver circuit to the mbed-enabled microcontroller platform.

　　The MAXREFDES89# is a tool for rapid development that offers optimal flexibility to the user during development of their application. In a final design, the MAX14871 may be the only required silicon for driving a brushed DC motor and regulating the motor’s current.

　　全桥DC马达驱动板MAXREFDES89#主要特性:

　　7V to 36V supply voltage range

　　On-board DC-DC for supplying VIN to mbed board

　　mbed library available

　　2A (max) current regulation limit per motor driver

　　Four motor drivers available

　　Arduino shield form factor

　　Competitive Advantages

　　Safe with 25% ripple current regulation flexible with wide supply voltage range

　　Saves power with Low RON

　　Robust with short-circuit protection to GND/VCC

　　全桥DC马达驱动板MAXREFDES89#应用:

　　Industrial automation

　　Printers scanners

　　Vending and gaming machines

　　Robotics

　　图3.全桥DC马达驱动板MAXREFDES89#外形图

　　图4.全桥DC马达驱动板MAXREFDES89#框图

　　全桥DC马达驱动板MAXREFDES89#材料清单: