DRV10987 Datasheet, PDF (10/69 Pages) Texas Instruments – DRV10987 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

DRV10987
SLVSE89 – AUGUST 2017
8 Detailed Description
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8.1 Overview
The DRV10987 device is a three-phase sensorless motor driver with integrated power MOSFETs that provides
drive-current capability up to 2 A continuously. The device is specifically designed for low-noise, low-external-
component-count motor-drive applications. The device is configurable through a simple I²C interface to
accommodate different motor parameters and spin-up profiles for different customer applications.
A 180° sensorless control scheme provides continuous sinusoidal output voltages to the motor phases to enable
ultra-quiet motor operation by keeping the electrically induced torque ripple small.
The DRV10987 device features extensive protection and fault-detection mechanisms to ensure reliable
operation. Voltage surge protection prevents the input V_CC capacitor from overcharging, which typically occurs
during motor deceleration. The device provides overcurrent protection without the need for an external current-
sense resistor. Rotor-lock detection is available through several methods. These methods can be configured with
register settings to ensure reliable operation. The device provides additional protection for undervoltage lockout
(UVLO) and for thermal shutdown.
The commutation control algorithm continuously measures the motor phase current and periodically measures
the V_CC supply voltage. The device uses this information for BEMF estimation, and the information is also
provided through the I²C register interface for debug and diagnostic use in the system, if desired.
A buck switching regulator efficiently steps down the supply voltage. The output of this regulator provides power
for the internal circuits and can also be used to provide power for an external circuit such as a microcontroller. If
providing power for an external circuit is not necessary (and to reduce system cost), configure the buck switching
regulator as a linear regulator by replacing the inductor with a resistor.
The DRV10987 device has a flexible interface, capable of supporting both analog and digital inputs. In addition to
the I²C interface, the device has FG, DIR, and SPEED pins. SPEED is the speed–command input pin. DIR is the
direction–control input pin. FG is the speed indicator output, which shows the frequency of the motor
commutation.
EEPROM is integrated in the DRV10987 device as memory for the motor parameter and operation settings.
EEPROM data transfers to the registers after power-on.
The DRV10987 device can also operate in register mode. If the system includes a microcontroller communicating
through the I²C interface, the device can dynamically update the motor parameters and operation settings by
writing to the registers. In this configuration, the EEPROM data is bypassed by the register settings.
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