infineon Z8F65006978 Motor control shield with IFX007T User Manual

infineon Z8F65006978 Motor control shield with IFX007T User Manual

About this document

Scope and purpose
This document describes how to use the motor control shield with IFX007T for Arduino.

Intended audience
Engineers, hardware and software designers who want to develop a powerful Arduino motor control project.

Motor control shield introduction

1.1 Motor control shield overview

The motor control shield adds powerful motor control to the Arduino projects. The shield can be controlled with the general logic IO-Ports of a microcontroller. Either an Arduino Uno or the XMC4700 Relax Kit from Infineon can be used as the master.

On board of the motor control shield are three IFX007T NovalithIC™. Each features one P-channel high side MOSFET and one N-channel low side MOSFET with an integrated driver IC in one package. Due to the P-channel high side switch a charge pump is not needed.

The IFX007T half-bridge is easy to control by applying logic level signals to the IN and INH pin. When applying a PWM to the IN pin the current provided to the motor can be controlled with the duty cycle of the PWM. With an external resistor connected between the SR pin and GND the slew rate of the power switches can be adjusted. The motor control shield can be easily connected to any Arduino board or the XMC4700 Relax Kit via headers.

Figure 1 Motor control shield photo

1.2 Key features

The motor control shield has the following features:

• An Arduino Uno, XMC4700 Relax Kit, or similar board connected to the shield can control the three half-bridges via the general IO pins
• Brushed DC Motor Control up to 250 W continuous load
• Adjustable slew rates for optimized EMI by changing external resistor
• Driver circuit with logic level inputs
• Status flag diagnosis with current sense capability
• Protection for example against overtemperature, overcurrent and cross current protection
• Reverse polarity protection with IPD90P04P4L
• Further comments:
  – Due to limited performance caused by the PCB layout, we recommend our customers to remove the capacitance C5 for high frequency applications. It is only layout related, not refer to the device.
  – The size of the DC-link capacity (C4 in schematic) with 560 µF is for most applications sufficient. But for high current applications, we recommend our customers to follow the design rule in our application note and replace the DC-link cap with a bigger one.
  – Due to the limited area of the PCB and the small DC-link cap, the demoboard shouldn’t be used for short circuit test.
  – Due to the limited pinout of the Arduino shield all IS pins of the three devices are connected together. According to different applications the value of R4 could be adjusted to achieve a better current sense performance.

Motor control shield description

For a safe and sufficient motor control design, discrete components are needed. Some of them must be dedicated to the motor application and some to the NovalithIC™.

Figure 2 and Figure 3 show the schematics plus the corresponding layout of the motor control shield. To reduce the cost, we use a DC-link cap of 560 µF and have limited PCB area. Therefore, the best performance of the device could not be achieved.

2.1 Schematics

In Figure 2 the schematics of the motor control shield is shown. The schematics are based on the application circuit in the IFX007T datasheet.

Figure 2 Schematic of motor control shield for Arduino with IFX007T

2.2 Layout

Figure 3 shows the layout of the motor control shield. The layout mainly follows the design rules in the Application Note. To reduce the cost, the PCB area is quite limited. Based on different applications customers could adjust the area to improve the GND plane and get better performance for their own PCB design.

Figure 3 Motor control shield for Arduino with IFX007T – Layout

2.3 Important design and layout rules

The basis for the following design and layout recommendations is the parasitic inductance of electrical wires and design guidelines as described in Chapter 3 of the Application Note.

• C4, so called DC-link capacitor: This electrolytic capacitor is required to keep the voltage ripple at the Vs-pin of the NovalithIC™ low during switching operation (the applied measurement procedure for the supply voltage is described in Chapter 2.1 of the Application Note). It is strongly recommended that the voltage ripple at the NovalithIC™ Vs-pin to the GND-pin is kept below 1 V peak to peak. The value of C4 must be aligned accordingly. See Equation 10 in the Application Note. Most electrolytic capacitors are less effective at cold temperatures. It must be assured that C4 is also effective under the worst case conditions of the application. The layout is very important too. As shown in Figure 6, the capacitor C4 must be positioned with very short wiring close to the NovalithIC™. This must be done to keep the parasitic inductors of the PCB-wires as small as possible.
• C15/C21/C22: This ceramic capacitors support C4 to keep the supply voltage ripple low and cover the fast transients between the Vs-pin and the GND-pin. The value of these ceramic capacitors must be chosen so that fast Vs-ripples at the NovalithIC™ do not exceed 1 V peak to peak. The layout wiring for C15/C21/C22 must be shorter than for C4 to the NovalithIC™ to keep the parasitic PCB-wire inductance as small as possible. In addition the parasitic inductance could be kept low by placing at least two vias for the connection to the GND plane.
• C6/C8/C14: These ceramic capacitors are important for EMI in order to avoid entering RF into the NovalithIC™ as much as possible. Good results have been achieved with a value of 220 nF. In terms of layout, it is important to place these capacitors between “OUT” and “Vs” without significant additional wiring from C6/C8/C14 to the Vs- and OUT-line. In case of higher PWM frequencies, the value of these capacitors might need to be reduced. The charge/discharge of the capacitors during switching causes power dissipation in the power stage and heats up the device.
• C2/C5/C7: These ceramic capacitor help to improve the EMC immunity and the ESD performance of the application. Good results have been achieved with a value of 220 nF. To keep the EMC and ESD out of the board, the capacitor is most effective when positioned directly next to the board connector. In addition, the parasitic inductance could be kept low by placing at least two vias for the connection to the GND plane. In case of higher PWM frequencies, the value of these capacitors might need to be reduced. The charge/discharge of the capacitors during switching causes power dissipation in the power stage and heats up the device.

Other components:

• IC0, D1 and R8: Reverse polarity protection. See Chapter 3.5 of the Application Note.
• R6/R9/R13: Slew rate resistors according to data sheet.
• C11/C12/C16: Stabilization for slew rate resistors (R6/R9/R13).
• R4: Resistors to generate a current sensing voltage from the IS current.
• C10: Ceramic capacitors for EMC immunity improvement. GND connection with at least two GND vias. A good value is 1 nF to 10 nF. In case the current should be measured during the PWM-phase this capacitor must be adapted to the ON-time inside the PWM-phase.
• R1/R2/R3/R5/R10/R11: Device protection in case of microcontroller pins shorted to Vs.

2.4 Pin assignment

To use the motor control shield the necessary control signals can be applied directly at the ArduinoTM
connectors. There is no need to use an Arduino or XMC™ 4700 Relax Kit to get the motor control shield into an application. The control pins are logic level inputs which can be driven by any other microcontroller or with logic level signals. Besides the supply voltage Vbat has to be provided to the Vbat connector. Figure 4 shows the pinout/connectors of the motor control shield.

Figure 4 Motor control shield connectors

2.5 Pin definitions and functions

Table 1 Pin definitions and functions

2.6 Hall sensor operation modes

Hall sensor based control
In order to enable motor control with Hall sensors the cables of the Hall sensors need to be soldered to J1.
Furthermore the resistors R18/R19/R20/R21/R22/R23/R25/R26/R27 have to be placed and R36/R37/R38 must be removed.

IFX007T overview

The IFX007T is an integrated high current half bridge for motor drive applications. It is part of the industrial & multi purpose NovalithIC™ family containing one P-channel high-side MOSFET and one n-channel low-side MOSFET with an integrated driver IC in one package. Due to the P-channel high-side switch the need for a charge pump is eliminated thus minimizing EMI. Interfacing to a microcontroller is made easy by the integrated driver IC which features logic level inputs, diagnosis with current sense, slew rate adjustment, dead time generation and protection against overtemperature, undervoltage, overcurrent and short circuit. The IFX007T provides a cost optimized solution for protected high current PWM motor drives with very low board space consumption.

3.1 Key features of IFX007T

Summary of features:

• Path resistance of max. 12.8 mΩ @ 25°C (typ. 10.0 mΩ @ 25°C)
• High side: max. 6.5 mΩ @ 25°C (typ. 5.3 mΩ @ 25°C)
• Low side: max. 6.3 mΩ @ 25°C (typ. 4.7mΩ @ 25°C)
• Enhanced switching speed for reduced switching losses
• Capable for high PWM frequency combined with active freewheeling
• Switched mode current limitation for reduced power dissipation in overcurrent
• Current limitation level of min. 55 A
• Status flag diagnosis with current sense capability
• Overtempertature shutdown with latch behavior
• Undervoltage shutdown
• Driver circuit with logic level inputs
• Adjustable slew rates for optimized EMI
• Operation up to 40 V
• Green Product (RoHS compliant)
• JESD471 Qualified

3.2 Block diagram

The IFX007T used in the motor control shield is an integrated high current half-bridge for motor drive applications. This device contains one P-channel high-side MOSFET and one N-channel low-side MOSFET with an integrated driver IC in one package. The industrial & multipurpose NovalithIC™ IFX007T is the interface between the microcontroller and the motor, equipped with diagnostic and protection functions.
As both the high-side and low side switch are placed on one single lead frame this results in many system benefits: Resulting from the low distance between the high-side MOSFET and the low-side MOSFET the stray inductance between them is minimal thus minimizing negative voltage spikes at OUT during switching and improving EMC. As the voltage level of the lead frame is on the output of the half-bridge, only one single cooling area is required (on OUT potential) for the device, thus being used for both a high-side or low-side current switching. For a state of the art N-channel solution, usually two cooling areas are required, each for the high side and low-side MOSFET.
Due to the p-channel high side switch the need for a charge pump is eliminated thus minimizing EMI. Interfacing to a microcontroller is made easily by the integrated driver IC which features logic level inputs, diagnosis with current sense, slew rate adjustment, dead time generation and protection against overtemperature, under voltage, overcurrent and short circuit.

Figure 5 Block diagram of IFX007T

3.3 Pin assignment

Figure 6 Pin assignment IFX007T (top view)

3.4 Pin definitions and functions of IFX007T

Table 2 Pin definitions and functions

Getting started

4.1 Motor control shield setup

• In case a Hall sensor based BLDC motor is operated, modify the board and remove/add resistors as described
• Select a brushed/brushless DC motor with up to 250W @ 24V
• Select a power supply with nom. 24 V, which is suitable to supply the motor
• Connect the power shield to Arduino Uno or XMC™ 4700 Relax Kit
• Connect power supply (5 V) to the Arduino Uno or XMC™ 4700 Relax Kit (Micro USB)
• Program the controller board with the motor control software: ARDUINO or DAVE™
• Connect the motor to U, V and W (H-bridge)
• Connect the DC adapter to the Power Shield (Vbat, GND)
• Turn on the power

4.2 Democode

Example software for Arduino are available. Please download demo code of half- bridge, H-bridge and BLDC motor control with Hall sensor from our website.

• Connect the Arduino Board with a micro USB cable to the USB port of your computer
• Download and install Arduino IDE
• Start Arduino IDE and open the demo code

Revision history

Important notice
The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics (“Beschaffenheitsgarantie”).

With respect to any examples, hints or any typical values stated herein and/or any information regarding the application of the product, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party.

In addition, any information given in this document is subject to customer’s compliance with its obligations stated in this document and any applicable legal requirements, norms and standards concerning customer’s products and any use of the product of Infineon Technologies in customer’s applications.

The data contained in this document is exclusively intended for technically trained staff. It is the responsibility of customer’s technical departments to evaluate the suitability of the product for the intended application and the completeness of the product information given in this document with respect to such application.

Warnings

Due to technical requirements products may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies office.

Except as otherwise explicitly approved by Infineon Technologies in a written document signed by authorized representatives of Infineon Technologies, Infineon Technologies’ products may not be used in any applications where a failure of the product or any consequences of the use thereof can reasonably be expected to result in personal injury.

Edition 2022-06-29
Published by
Infineon Technologies AG
81726 Munich, Germany

© 2022 Infineon Technologies AG
All Rights Reserved.
Do you have a question about any
aspect of this document?
Email:erratum@infineon.com

Document reference
IFX-fkx1656420536241

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