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DRV8307RHAT Datasheet(数据表) 20 Page - Texas Instruments

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部件型号  DRV8307RHAT
说明  Brushless DC Motor Controller
下载  33 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
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DRV8307RHAT Datasheet(HTML) 20 Page - Texas Instruments

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 20 page
background image
+
-
Hx±
Hx+
Hall
Sensor
Hall
Amp
VREG
VCC
OUT
GND
To Other
Hx± Inputs
All Resistors 1 to 4.7 k
±
+
+
-
Hall
Sensor
Optional
Hall
Amp
VREG
INP
OUTP
INN
OUTN
Hx±
Hx+
±
+
20
DRV8307
SLVSCK2A – APRIL 2014 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: DRV8307
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
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
8.1.1 Hall Sensor Configurations and Connections
The Hall sensor inputs on the DRV8307 device are capable of interfacing with a variety of Hall sensors.
Typically, a Hall element is used, which outputs a differential signal on the order of 100 mV. To use this type of
sensor, the VREG regulator can be used to power the Hall sensor. Figure 11 shows the connections.
Figure 11. Differential Hall Sensor Connections
Since the amplitude of the Hall sensor output signal is very low, often capacitors are placed across the Hall
inputs to help reject noise coupled from the motor PWM. Typically capacitors from 1 to 10 nF are used.
Some motors use digital Hall sensors with open-drain outputs. These sensors can also be used with the
DRV8307 device, with the addition of a few resistors (see Figure 12).
Figure 12. Single-Ended Hall Sensor Connections
The negative (Hx–) inputs are biased to 2.5 V by a pair of resistors between VREG and ground. For open-
collector Hall sensors, an additional pullup resistor to VREG is needed on the positive (Hx+) input.




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