DRV11873EVM

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 .................................................................................................................. 2.1 Power Connectors ................................................................................................. 2.2 Test Points .......................................................................................................... 2.3 Jumpers ............................................................................................................. 2.4 Speed Adjust Potentiometer (R6) ................................................................................ 2.5 Motor Outputs ...................................................................................................... 2.6 Operation of the EVM ............................................................................................. Schematic .................................................................................................................... Bill of Materials .............................................................................................................. 2 2 2 3 4 6 7 7 8 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 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated DRV11873 Evaluation Module 1 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. The DRV11873EVM also has a jumper on the FR pin to select forward or reverse and a jumper on the FS pin to vary for high- or low-speed motor applications. Power can be provided externally, up to 16 V, through the power header. The PWM, RD, FG, and GND signals are all brought out to surface mounted test points. The DRV11873EVM is configured so that connections to only the motor and power supply are required. 2.1 Power Connectors The DRV11873EVM uses a combination of headers for the application and monitoring of power. For the EVM, only a single power-supply rail is necessary. Minimum recommended Vin for the EVM is 5 V and maximum is 16 V. Please see the datasheet for the DRV11873 for complete voltage range information of the driver itself. When power is supplied to the board a green LED (D3) in the upper-left corner should enable. The overcurrent threshold setup pin sets the current limit for the device and is connected to a 3.3-kΩ resistor (R3) on the DRV11873EVM. This sets the current limit at 2 A for the DRV11873. This resistor can be replaced and a new current limit set using Equation 1. Please see the datasheet for the DRV11873 for more information on the overcurrent threshold setup pin. ILIMIT (mA) = 6600 / RCS (Ω) for 500 mA < ILIMIT < 2000 mA 2 DRV11873 Evaluation Module (1) SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated 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. In order to provide your own PWM signal to the motor driver, remove the 0.0-Ω resistor (R5) and connect your own PWM signal to the PWM test point. The PWM signal generated by the circuitry on the EVM is approximately 25 kHz and can be adjusted from 5% to 95% duty cycle by the potentiometer (R6) located on the EVM. The FG signal’s frequency represents the motor speed and phase information. RPM = (FG × 60) / pole pairs (2) Please refer to the datasheet of the DRV11873 for more information regarding the FG pin. The RD pin is an open drain output which is tied to 5 V through a pull-up resistor. In this case, the pull-up resistor value (R8) is 100 kΩ. During the lock protection condition, RD output remains high until the lock protection is dismissed and restart completed. A current limit function has been built in for the RD pin which prevents the open drain MOSFET from damage in case VCC or 5 V directly connects to the RD pin. Please refer to the datasheet of the DRV11873 for more information regarding the RD pin. SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated DRV11873 Evaluation Module 3 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. Jumper J3 connects the FG pin of the DRV11873 to an onboard pull-up resistor to 5 V. Remove jumper J3 if the use of an external pull-up resistor is desired. Jumper J4 is used to connect the RD pin of the DRV11873 through a pull-up resistor to 5 V. When removed, the pin will float. For normal operation right out of the box, all jumpers should be installed. Figure 2. Jumper Settings 2.3.1 FR Forward and Reverse (J1) Jumper J1 can be found in Figure 2. Installing the jumper connects the FR pin on the DRV11873 to GND. When the FR pin is tied to GND, the motor is set to spin in forward rotation. When removed, the pin is pulled high and the motor will spin in reverse. FR is latched upon power to the EVM so power must be cycled in order for the motor direction to change. 2.3.2 FS Frequency Select (J2) Jumper J2 can be found in Figure 2. Installing the jumper connects the FS pin on the DRV11873 to GND. When the FS pin is tied to GND, the DRV11873 is set for optimized startup for low fan speed motors with high motor winding resistance and high inductance. With the jumper out, the FS pin pulls up to VCC through a pull-up resistor. When the FS pin is tied to VCC, the DRV11873 is optimized for startup for high speed fan motors with low motor winding resistance and high inductance. FS is latched upon power to the EVM so power must be cycled in order for the FS output to change. 4 DRV11873 Evaluation Module SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated 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. Please note that if the jumper is removed, an external pull-up resistor is needed for connection of FG to an external system. For more information regarding the FG pin please refer to the DRV11873 datasheet (SLWS237). Figure 3. FG Test Point 2.3.4 RD Rotation Detection (J4) Jumper The RD pin is an open-drain output which is tied to 5 V through a pull-up resistor when J4 is in place. In this case, the pull-up resistor value (R8) is 100 kΩ. During the lock protection condition, RD output remains high until the lock protection is dismissed and restart completed. With J4 removed, the pin will float when the lock protection condition occurs. The jumper allows for external pull-up resistors to be used to change the value of RD when lock detection takes place. Please refer to the datasheet of the DRV11873 for more information regarding the RD pin. SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated DRV11873 Evaluation Module 5 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. DRV11873 Speed-Adjust Potentiometer The onboard PWM signal for the DRV11873 is generated by a circuit based upon TI's TLC555 Low Power Timer. It is capable of an approximately 25-kHz output that can be adjusted from 5% to 95% duty cycle. This square output signal will switch from 0 V to 5 V. In order to provide an external PWM signal to the DRV11873, first remove the 0.0-Ω resistor, R5. Next, connect the external PWM signal to the PWM surface mounted test point. For more information on the PWM input required by the DRV11873 please refer to the datasheet. 6 DRV11873 Evaluation Module SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated 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. Apply power to the H1 header. 4. Adjust the Spd_Adj potentiometer counter-clockwise towards the motor outputs to increase speed and the motor will start to turn. Continue adjusting as desired. 5. To change direction, disconnect power and remove J4. SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated DRV11873 Evaluation Module 7 Schematic 3 www.ti.com Schematic Figure 6 is the DRV11873 schematic. Figure 6. DRV11873 Schematic 8 DRV11873 Evaluation Module SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated 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 0.1UF 25V Y5V 0402 C4, C5, C7 445-3445-1-ND TDK Corporation C1005Y5V1E104Z 3 CAP CER 10000PF 25V 10% X7R 0402 C6, C8 445-1260-1-ND TDK Corporation C1005X7R1E103K 2 DIODE SCHOTTKY 1A 40V MICROSMP D1, D2 MSS1P4-M3/89AGICT-ND Vishay General Semiconductor MSS1P4-M3/89A 2 LED 1.6X0.8MM 570NM GRN CLR SMD D3 754-1116-1-ND Stanley Electric & Co HBR1105W-TR 1 PC TEST POINT MINIATURE SMT FG, GND, PWM, RD 534-5019 (Mouser) Keystone Electronics 5019 4 Header, 2-Pin H1, J1, J2, J3, J4 3M9447-ND 3M 961102-6404-AR 5 Header, 4-Pin H2 3M9449-ND 3M 961104-6404-AR 1 RES 330 OHM 1/10W 5% 0402 R1 SMD P330JCT-ND Panasonic - ECG ERJ-2GEJ331X 1 RES 10K OHM 1/10W 5% 0402 SMD R2, R4, R9 P10KJCT-ND Panasonic - ECG ERJ-2GEJ103X 3 RES 3.3K OHM 1/10W 5% 0402 SMD R3 P3.3KJCT-ND Panasonic Electronic Components ERJ-2GEJ332X 1 RES 0.0 OHM 1/16W 0402 SMD R5 311-0.0JRCT-ND Yageo RC0402JR-070RL 1 POT 5.0K OHM THUMBWHEEL CERM ST R6 3352T-502LF-ND Bourns Inc. 3352T-1-502LF 1 RES 100K OHM 1/10W 5% 0402 SMD R7, R8 P100KJCT-ND Panasonic - ECG ERJ-2GEJ104X 2 RES 1DNP 5% 0603 SMD R10, R11, R12 DNP DNP DNP 3 IC OSC MONO TIMING 2.1MHZ 8-SOIC U1 296-10341-1-ND Texas Instruments TLC555QDR 1 12-V, 3-PHASE, SENSORLESS BLDC MOTOR DRIVER U2 Supplied Texas Instruments DRV11873 1 SLWU083A – February 2013 – Revised April 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated DRV11873 Evaluation Module 9 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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