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DRV8256 데이터시트(PDF) 27 Page - Texas Instruments

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부품명 DRV8256
상세설명  DRV8256E/P H-Bridge Motor Driver With Integrated Current Sense and Smart Tune Technology
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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DRV8256 데이터시트(HTML) 27 Page - Texas Instruments

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8 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification, and TI
does not warrant its accuracy or completeness. TI’s customers are responsible for determining
suitability of components for their purposes. Customers should validate and test their design
implementation to confirm system functionality.
8.1 Application Information
The DRV8256E/P devices can be used in a variety of applications that require a H-bridge power stage
configuration. Common application examples include brushed DC motors. The application examples below will
highlight how to use the device in bidirectional current control applications requiring an H-bridge driver.
8.2 Typical Application
In this application example, the device is configured to drive a bidirectional current through a brushed DC motor
using an H-bridge configuration. The H-bridge polarity and duty cycle are controlled with a PWM and IO resource
from the external controller to the IN1 and IN2 pins. The current limit threshold (ITRIP) is generated with a resistor
divider from the VREF pin. The device is configured for the smart tune ripple control decay by tying the DECAY
pin to DVDD.
Figure 8-1. Typical Application Schematic
8.2.1 Design Requirements
Table 8-1 lists the design input parameters for system design.
Table 8-1. Design Parameters
DESIGN PARAMETER
REFERENCE
EXAMPLE VALUE
Supply Voltage
VM
24 V
Output RMS Current
IRMS
3.5 A
Current Regulation Trip Point
ITRIP
4 A
Switching Frequency
fPWM
35 kHz
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DRV8256
SLOSE50 – DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
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