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User's Guide

SLWU083A–February 2013–Revised April 2013

DRV11873 Evaluation Module

This document is provided with the DRV11873 customer evaluation module (EVM) as a supplement to the

DRV11873 datasheet (SLWS237). It details the hardware implementation of the EVM.

Contents

1 PCB (Top 3D View) ......................................................................................................... 2

2 Introduction .................................................................................................................. 2

2.1 Power Connectors ................................................................................................. 2

2.2 Test Points .......................................................................................................... 3

2.3 Jumpers ............................................................................................................. 4

2.4 Speed Adjust Potentiometer (R6) ................................................................................ 6

2.5 Motor Outputs ...................................................................................................... 7

2.6 Operation of the EVM ............................................................................................. 7

3 Schematic .................................................................................................................... 8

4 Bill of Materials .............................................................................................................. 9

List of Figures

1 Top View (H1 Power Supply Header) .................................................................................... 3

2 Jumper Settings............................................................................................................. 4

3 FG Test Point................................................................................................................ 5

4 DRV11873 Speed-Adjust Potentiometer................................................................................. 6

5 DRV11873 Motor Outputs ................................................................................................. 7

6 DRV11873 Schematic...................................................................................................... 8

SLWU083A–February 2013–Revised April 2013 DRV11873 Evaluation Module

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Summary of content (10 pages)

PAGE 1
User's Guide SLWU083A – February 2013 – Revised April 2013 DRV11873 Evaluation Module This document is provided with the DRV11873 customer evaluation module (EVM) as a supplement to the DRV11873 datasheet (SLWS237). It details the hardware implementation of the EVM. 1 2 3 4 Contents PCB (Top 3D View) ......................................................................................................... Introduction ......................................................................................
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PCB (Top 3D View) 1 PCB (Top 3D View) 2 Introduction www.ti.com The DRV11873EVM is a complete solution for evaluating the DRV11873 12-V, three-phase, sensorless BLDC motor driver. It includes a TLC555 timer configured to supply a PWM to the DRV11873, a potentiometer to adjust the speed of the motor by varying the duty cycle of the PWM, a jumper on the FG pin to allow the use of an external pull-up resistor, and a jumper on the RD pin to indicate that the motor has entered a lock protection state.
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Introduction www.ti.com VCC for the DRV11873 is directly taken off the H1 power supply header. The H1 header is located on the top side of the EVM near the top of the board as shown in Figure 1. Figure 1. Top View (H1 Power Supply Header) 2.2 Test Points Test points are provided and labeled according to the inputs and outputs of the DRV11873 motor driver. The signals brought out to test points are labeled FG, RD, PWM, and GND. The signal PWM is generated by circuitry on the EVM.
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Introduction 2.3 www.ti.com Jumpers There are four jumpers (J1 – J4) on the EVM that are normally installed. Jumper J1 connects the FR pin of the DRV11873. When installed, the pin is set low for forward rotation. When removed, the pin is pulled high and the motor will spin in reverse. Jumper J2 connects the FS pin of the DRV11873 to adjust for different speed selections for various applications. When installed, the FS pin is set to pull low. When J2 is open, the FS pin pulls high.
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Introduction www.ti.com 2.3.3 FS Frequency Generator (J3) Jumper J3 can be found in Figure 2. Installing the jumper will connect the FG pin of the DRV11873 to an on board pull-up resistor. If you wish to make an external connection to FG, the jumper can be removed and the FG test point provides a direct connection to the FG pin of the DRV11873. The FG test point is highlighted in Figure 3.
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Introduction 2.4 www.ti.com Speed Adjust Potentiometer (R6) The speed-adjust potentiometer Spd_Adj can be found in Figure 4. The potentiometer adjusts the duty cycle of the PWM signal which, will in turn, adjust the speed of the motor. In order to lower the duty cycle, and in turn, lower the speed, turn the potentiometer clockwise. In order to increase the duty cycle, and in turn, increase the speed, turn the potentiometer counter-clockwise. Figure 4.
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Introduction www.ti.com 2.5 Motor Outputs Connect a three-phase 12-V BLDC motor to pins A, B, C, and COM of the header H2. Polarity is not critical for A, B, and C. The motor outputs are located on H2 as shown in Figure 5. Figure 5. DRV11873 Motor Outputs 2.6 Operation of the EVM 1. Connect a 12-V, three-phase BLDC motor to pins A, B, C, and COM of H2. 2. Adjust the Spd_Adj potentiometer (R6) to minimum voltage by turning it all the way clockwise. This will minimize the motor speed. 3.
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Schematic 3 www.ti.com Schematic Figure 6 is the DRV11873 schematic. Figure 6.
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Bill of Materials www.ti.com 4 Bill of Materials Table 1 is the bill of materials for the EVM. Table 1. DRV11873 Bill of Materials Description Designator DigiKey Part # Manufacturer MFG Part Number Qty CAP CER 10UF 25V 10% X5R 0805 C1, C3 490-5523-1-ND Murata Electronics North America GRM21BR61E106K A73L 2 CAP CER 2.2UF 25V 10% X5R C2 0603 587-2909-1-ND Taiyo Yuden TMK107ABJ225KAT 1 CAP CER 0.
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