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User Guide for ALLEGRO models including: A4919 Evaluation Board, A4919, Evaluation Board
A4919: Three-Phase MOSFET Driver with Integrated Regulator
File Info : application/pdf, 13 Pages, 2.98MB
DocumentDocumentAPEK4919GET-01-T A4919 Evaluation Board User Guide DESCRIPTION This board provides the basic components required to use the A4919 to drive a motor. The motor can be controlled via an externally supplied PWM signal input on the logic input terminals. The circuit diagram is shown on page 6 of this guide. The maximum current limit for the board is 10 A, and it is important to keep the maximum current below this value. All information on how to use this board is described in this guide as well as the full circuit schematic. The component placement and layout are shown on pages 7 through 9. FEATURES · 28-pin QFN package A4919GETTR-T gate driver · 5 V on-board voltage regulator · High-current three-way connector for motor connection · High-current two-way connector for supply connection · Fault display LED · Eight-position DIP switch for manual control of logic inputs EVALUATION BOARD CONTENTS A4919 evaluation board with A4919 device soldered on. Figure 1: A4919 Evaluation Board Table of Contents Description .......................................................................... 1 Features ............................................................................. 1 Evaluation Board Contents.................................................... 1 Using the Evaluation Board ................................................... 2 Performance Data ................................................................ 5 Schematic ........................................................................... 6 Layout ................................................................................ 7 Bill of Materials .................................................................. 10 Related Links..................................................................... 12 Application Support ............................................................ 12 Revision History................................................................. 13 Table 1: General Specifications Specification Board Current Limit Min. Nom. 10 Max. 20 (peak) Units A APEK4919GET-01-T-UM MCO-0001414 June 26, 2023 USING THE EVALUATION BOARD Board Setup and Operation In order to run a motor using the A4919 evaluation board, the following items are required: · A4919 evaluation board · External motor supply (5.5 to 50 V) · External method of switching the outputs (e.g., PWM signal generator) A typical connection diagram is shown in Figure 2. The A4919 evaluation board can be used in conjunction with an external microcontroller using the logic input terminals. Board Connections The A4919 evaluation board has four connectors. · X1: A single three-way screw connector for the motor connections · X2: One two-way screw connector for the main supply · X3: One two-way connector that provides the supply from the 5 V on-board voltage regulator · X5: A 26-pin IDC cable connector to interface to an external microcontroller (X5) Note : X4 connector is not used for this product variant. Power Connections A positive supply between 5.5 and 50 V should be connected to X2 (labelled VBAT). The supply return is labelled PGND at X2. The power source for the motor phase current must be capable of providing the necessary continuous input current at the required input voltage to drive the motor up to the board current limit plus an inrush current. The motor supply voltage must not exceed 50 V in any conditions, otherwise permanent damage may occur to the A4919, other components on the board and possibly the motor. In normal operation, the current limit of the supply should be set to twice the maximum operating current for the motor being driven. The two-way connector X3 provides an output for the 5 V LDO voltage for biasing external circuitry. The voltage of this connector can be measured via the VBIAS test point. If this voltage is not required, then J1 can be removed from the evaluation board. The VDDM pin is a logic voltage monitor input, and this pin must be connected to the on-board 5 V regulator U2. The voltage of the regulator can be sensed on the VU2 test point. Load Connections A three-phase BLDC motor is connected through the three-way screw terminal, X1, labelled A, B, and C. Each letter represents the phase connection and has the same potential as the respective Sx terminal. The current to drive the motor is provided via the three-phase MOSFET bridge from the main supply connected to X2. Control Connections The control of the evaluation board can be achieved by an externally generated PWM signal applied to connector X5. The positive signal level needs to be connected to any of the X5 terminals: X5.9, X5.10, X5.11, X5.12, X5.13, X5.14, according to which channel needs to be driven. The return path must be connected to any GND terminals of the evaluation board namely GND2 or GND3. Alternatively, there is an on-board DIP switch, S1, which might be used to set the control logic inputs AHI, ALO, BHI, BLO, CHI, and CLO. More information on how to use the board can be found in the next sections. Figure 2: Connection diagram for motor and supply connections 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Setting up for First-Time Use Before operating the evaluation board for the first time, it should be set into a safe condition to avoid overcurrent stress to any components or attached load. The jumpers should be in their default position as shown in Table 1 and all switches on S1 should be in the off position. Set the Supply Current to the Minimum Before connecting the supply for the first time, ensure the supply current limit is set to a low value to avoid unexpected current caused by any component or load problems--300 mA is recommended when the motor is connected. After connecting the power supply to VBAT (connector X2), the power supply current should be less than 5 mA at 12 V without any load/motor connected. Once the supply voltage and current have been checked, the board is ready for use. Initial Functionality Check Before connecting the motor to the board, an initial check of the board supplies will confirm your connections are correct. This can be accomplished following the sequence below: 1. Power-up the board via VBAT (start with 12 V). 2. Check VBAT supplies the correct voltage to VBB. This can be done by measuring either the positive side of the C5, or the side connected to the VBB pin from the J5 jumper. 3. Check VBAT supplies the correct voltage to VBRG, by measuring the voltage on terminal VBRG. This will also confirm that J10 is correctly placed. 4. Set S1 DIP 7 (VDDM) and S1 DIP 1 (AHI) to the on position and confirm VREG is within the datasheet specification by measuring the voltage on the VREG test point. 5. Confirm LED1 FAULT is not illuminated. Faults are explained under the Diagnostics section of the product datasheet. 6. Check the state of each control logic input corresponds to its respective S1 DIP switch setting. For example, when AHI is commanded on (S1 DIP 1 is in the on position or PWM signal being high), then the AHI terminal should go to high (5 V) and when it is commanded off (S1 DIP 1is in the off position, or PWM signal being low, then the AHI terminal should be low (0 V). If all of the above is as expected and specified within the product datasheet, the next step is to connect the motor to the board. Important Additional Notes For the A4919 to come out of sleep mode and operate, two conditions should be satisfied. 1. A voltage greater than the gate drive disable threshold VGDD (typically 1.5 V as defined in the Electrical Characteristics table of the A4919 datasheet) should be present on pin 20 (VDDM). Otherwise, the charge pump is turned off and all gate drive outputs will remain disabled. 2. One or more logic inputs should be switched on, either via the S1 DIP switch or an external PWM signal. Table 2: Default jumper connections Jumper Terminal Detail J1 Enable output to connector X3 J2 Configures VBIAS as 5 V J3 VBB supply to on-board 5 V regulator J4 Enable output to connector X4 J5 Supply voltage to VBB input J6 Connect VU1 to VDDM J7 Fault pin pullup; if a fault is present, the internal pull-down is off, and the FAULT output is pulled up to approximately VBIAS J8 Enable input to VDSTH programming pin J9 VDSTH programming selection: Internal hardwired value / Disabled / Voltage select using pot R15 J10 VBB supply to VBRG pin Default Setting Short VU2 position Short Open Short Short Short Short INT position Short 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Controlling the Motor The A4919 can control the motor by switching the outputs on and off. There are two ways to achieve this: either by controlling the inputs of the A4919 via a PWM signal or via the S1 DIP switch which will keep the outputs 100% on or off. Before driving the A4919, ensure that the PWM signal is set up according to the user timing requirements, i.e., frequency, duty, etc. The expected outputs for a PWM control are shown in Figure 3. Figure 3a: Correct operation showing the high-side driver Figure 3b: Correct operation showing the low-side driver 4 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com EVALUATION BOARD PERFORMANCE DATA The board is rated for up to 10 A of DC current. This value should not be exceeded. 5 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SCHEMATIC 1 2 3 4 5 6 X3 VBIAS X3.1 GND + C1 10u 25V X3.2 A GND GND X4 VU2 VU2 J1 VBIAS VBIAS J2 VU2 VU1 C3 1u 25V VU1 GND VU1 U2 OUT IN 5V + C2 GND C18 J3 10u 100n 25V 50V GND GND GND D2 VBAT X2 VBAT X2.1 GND X2.2 A PGND VU1 X4.1 + DNF C19 C4 J4 1N4148W GND 10u 1u 25V 25V J6 C5 J5 X4.2 220n GND GND GND 50V C20 1u C6 X5 VBIAS GND X5.1 X5.2 X5.3 VBIAS R3 1k GND 25V DNF GND R10 10k GND 470n 25V VREG U1 C7 + C8 100n 10u 25V 25V VDDM, V3, V5 3 VBB 28 CP2 26 CP1 27 X5.4 16 B X5.5 ON 15 14 13 12 11 10 9 S1: 1 AHI 2 ALO 3 BHI FAULT X5.6 X5.7 FAULT 1 2 3 4 5 6 S1 12345678 7 8 4 BLO 5 CHI 6 CLO 7 VDDM J10 GND GND VREG 25 VBRG 1 VBRG C14 CA B + C9 + C10 C11 C12 C13 1000u 1000u 100n 100n 100n 50V 50V 50V 50V 50V X5.8 X5.9 AHI R4 1k GND 8 FAULT AHI 6 AHI CA 24 GHA 22 GHA 220n R16 22R 25V R17 470k M1 IRFR2405PBF PGND PGND PGND PGND PGND ALO BHI X5.10 X5.11 R5 1k R6 1k ALO BHI 7 ALO 8 BHI SA 23 GLA 21 SA GLA R18 22R M2 IRFR2405PBF X1 BLO CHI CLO X5.12 X5.13 X5.14 R7 1k R8 1k R9 1k BLO 9 BLO A4919ET C15 CB R19 470k CHI CLO 10 CHI 11 CLO CB 20 GHB 220n R20 22R M3 GHB 18 25V R21 470k A X1.3 B X5.15 SB 19 SB X1.2 X5.16 GLB 17 GLB R22 22R M4 C C X5.17 C X5.18 X5.19 VDSTH X5.20 VDSTH J7 FAULT FAULT VDSTH VDSTH 5 FAULT 4 VDSTH CC 16 GHC 14 SC 15 CC GHC SC C16 220n R24 22R 25V R23 470k R25 470k X1.1 M5 X5.21 VU1 VU1 X5.22 VBIAS J8 VBIAS GLC 13 GLC R26 22R M6 X5.23 VU2 VU2 X5.24 R30 R13 3k3 4k7 LSS 12 LSS R27 470k 2 GND 29 ePAD X5.25 X5.26 R11 1k VU1 R31 LED1 100k FAULT R14 4k7 J9 INT DIS GND2 GND3 GND1 R28 TBC DNF R29 TBC DNF Q1 GND GND R12 R38 R15 C17 D 270k 100k 100n 25V VDSTH SET GND GND GND PGND PGND D TITLE: A4919ET (QFN28) Customer Demonstration Board Allegro Microsystems 115 Northeast Cutoff Worcester MA 01606 USA REV: 0 AUTHOR: S.Ehara DATE: 1st May 2018 SIZE: B4 SHEET: 1 of 1 PCB: EDC158R0 1 2 3 4 5 6 6 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com LAYOUT 7 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com BILL OF MATERIALS Table 3: Axxxxx Version Evaluation Board Bill of Materials ELECTRICAL COMPONENTS Designator Quantity Description C1, C8 2 Capacitor: Alu Electrolytic Radial C2 1 Capacitor: Alu Electrolytic SMT C3, C4 2 Capacitor: Ceramic Chip C5 1 Capacitor: Ceramic Chip C6 4 Capacitor: Ceramic Chip C7, C17 1 Capacitor: Ceramic Chip C9, C10 2 Capacitor: Ceramic Chip C11, C12, C13, C18 2 Capacitor: Ceramic Chip C14, C15, C16 3 Capacitor: Ceramic Chip D2 4 Diode: 100 V, 0.15 A GND1 1 Test Point: 1.4 mm Round Loop, Black GND2, GND3 1 J1, J3, J4, J5, J6, J7, J8, J10 2 J2, J9 8 LED1 2 M1, M2, M3, M4, M5, M6 1 PCB 6 Q1 5 R3, R4, R5, R6, R7, R8, 1 R9, R11 R10 1 R12 8 R13, R14 1 R15 1 R16, R18, R20, R22, 2 R24, R26 R17, R19, R21, R23, 1 R25, R27 R30 1 R31, R38 2 S1 1 Ground Bar: Tinned Copper Wire Jumper: Header Male 2-pin Jumper: Header Male 3-pin LED: SMT, 2-pin, Red MOSFET: N-Channel, 56 A, 55 V PCB: A4919GET Demo Board EDC158R0 Transistor: NPN, 50 V, 0.5 A Resistor: Ceramic Chip Resistor: Ceramic Chip Resistor: Ceramic Chip Resistor: Ceramic Chip Resistor: Trim Pot, 3296Y, 25 k Resistor: Ceramic Chip Resistor: Ceramic Chip Resistor: Ceramic Chip Resistor: Ceramic Chip Resistor: Ceramic Chip U1 1 Allegro Motor Driver U2 1 Voltage Regulator 5 V Manufacturer Multicomp Panasonic Multicomp KEMET Murata Murata KEMET Panasonic KEMET Diodes Keystone Electronics Multicomp Harwin Amphenol ams OSRAM Infineon Nexperia Multicomp Multicomp TT Welwyn Multicomp Bourns Multicomp Multicomp Multicomp Multicomp Grayhill Allegro Microsystems TI Manufacturer Part Number MCMR25V106M4X7 EEEFP1E100AR MC1206B105K250CT C0805X224K5RACTU GRM21BR71H224KA01L GCJ21BR71H474KA12L C0805C104K5RACTU ECA1HHG102 C0805X224K5RACTU 1N4148W-7-F 5001 TCW20 500G M20-9990246 G800W305018EU LS M676-P2S1-1 IRFR2405TRPBF BC817-25,215 MCMR08X1001FTL MCMR08X1002FTL WCR0805-270KFI MCMR08X4701FTL 3296Y-1-253LF MCMR08X22R0FTL MCMR08X4703FTL MCSR08X3301FTL MCSR08X1003FTL 78B08ST A4919ET LM2936HVBMA-5.0/NOPB PCB Label C1, C8 C2 C3, C4 C5 C6 C7, C17 C9, C10 C11, C12, C13, C18 C14, C15, C16 D2 GND1 GND2, GND3 J1, J3, J4, J5, J6, J7, J8, J10 J2, J9 LED1 M1, M2, M3, M4, M5, M6 PCB Q1 R3, R4, R5, R6, R7, R8, R9, R11 R10 R12 R13, R14 R15 R16, R18, R20, R22, R24, R26 R17, R19, R21, R23, R25, R27 R30 R31, R38 S1 U1 U2 10 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Table 3: Axxxxx Version Evaluation Board Bill of Materials (continued) OTHER COMPONENTS Designator Quantity Description Manufacturer X1 1 Connector: Screw Terminal, 3-way, 30 A Phoenix Contact X2 1 Connector: Screw Terminal, 2-way, 30 A Phoenix Contact X3, X4 2 Connector: Screw Terminal, 2-way, 20 A Weidmuller X5 1 Connector: IDC 26-way Ribbon Header 3M AHI, ALO, BHI, BLO, CA, CB, CC, CHI, CLO, FAULT, GHA, GHB, GHC, GLA, GLB, GLC, LSS, 26 SA, SB, SC, VBIAS, VBRG, VDSTH, VREG, VU1, VU2 Test point Keystone Electronics JMP_ SHORT_R 10 ESDBAG_6x8 1 Jumper Short Link: Red ESD bag 6" × 8" Harwin Desco SCS Manufacturer Part Number 1731734 PCB Label X1 1731721 PM5.08/2/90BLK N2526-6002-RB 5000 M7566-05 10068 X2 X3, X4 X5 AHI, ALO, BHI, BLO, CA, CB, CC, CHI, CLO, FAULT, GHA, GHB, GHC, GLA, GLB, GLC, LSS, SA, SB, SC, VBIAS, VBRG, VDSTH, VREG, VU1, VU2 11 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com RELATED LINKS Product page and information: https://www.allegromicro.com/en/products/motor-drivers/bldc-drivers/a4919 APPLICATION SUPPORT For technical support, contact Allegro using the email addresses on this page: https://www.allegromicro.com/en/about-allegro/contact-us/technical-assistance For sales support, contact Allegro by filling in the form on this page: https://go.allegromicro.com/contact-sales For any other enquiries, use the information of this page: https://www.allegromicro.com/en/about-allegro/contact-us 12 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Revision History Number Date June 26, 2023 Initial release Description Copyright 2023, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro's products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro's product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents. 13 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com