Datasheet

www.ti.com

INTRODUCTION

2 INTRODUCTION

The DRV10866EVM is a complete solution for evaluating the DRV10866 5-V, three-phase sensorless

BLDC motor driver. It includes a TLC555 timer configured to supply a PWM to the DRV10866, 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 FGS pin to set ½ or normal

frequency output on the FG pin. Power can be provided with the included micro-USB cable for 5 V or

externally provided, up to 5.5 V, through the power header. The PWN, FG, and GND signals are all

brought out to surface mounted test points.

The DRV10866EVM is configured so that connections to only the motor and power supply are required.

2.1 Power Connectors

The DRV10866EVM uses a combination of headers and a USB input jack (on bottom side) for the

application/monitoring of power. For the EVM, only a single power supply rail is necessary. Minimum

recommended V

for the EVM is 2 V and maximum is 5.5 V. Please see the datasheet for the DRV10866

for complete voltage range information of the driver itself. When power is supplied to the board a green

LED (D3) in the bottom right corner should enable.

The overcurrent threshold setup pin sets the current limit for the device and is connected to a 3.8-kΩ

resistor (R6) on the DRV10866EVM. This sets the current limit at 820 mA for the DRV10866. This resistor

can be replaced and a new current limit set using the equation seen below. Please see the datasheet for

the DRV10866 for more information on the overcurrent threshold setup pin.

LIMIT

(mA) = 3120/R

(kΩ) (1)

VCC for the DRV10866 is directly taken off the micro USB jack supply or J4 power supply header. The J4

header is located on the top side of the EVM near the bottom right of the board as shown in Figure 3. The

micro USB jack is located on the bottom side of the board as shown in Figure 4. The micro USB jack is

only to supply power for the EVM and does not provide any additional functionality. Please choose only

one method for providing power to the EVM.

Figure 3. Top View (J4 Power Supply Header) Figure 4. Bottom View (Micro USB Jack)

NOTE: It is only necessary to provide one source of power for the EVM. DO NOT connect to both

the micro USB jack and the J4 power supply header.

2.2 Test Points

Test points are provided and labeled according to the inputs/outputs of the DRV10866 motor driver. The

signals brought out to test points are labeled “FG”, “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-Ω

resistor (R6) 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 (R1) located on the EVM.

SBVU020A–November 2012–Revised December 2012 DRV10866EVM User’s Guide

Submit Documentation Feedback