标题：TI-DRV10987.pdf - TI电机驱动器文档及相关技术信息

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The provided content appears to be snippets from a technical document related to the TI-DRV10987 motor driver. This document includes various electronic components and their specifications, such as capacitors, inductors, voltage regulators, and microcontroller interfaces. The document starts with the title "TI-DRV10987.pdf" and repeats this information throughout the content. It also contains a series of numbers, presumably related to the specifications of the electronic components mentioned in the document. The copyright notice at the bottom indicates that the document is copyrighted by Texas Instruments Incorporated in 2017. The content is structured with a combination of alphanumeric characters and symbols representing various components, such as VC, PC, PP, CP, NS, WS, WG, GND, VREG, V1P8, V3P3, SCL, SDA, FG, VCC, WW, VV, UU, PGNDDIR, SPEED. These components likely refer to specific connections or functions within the motor driver system. The technical nature of the content suggests that it is intended for individuals with knowledge in electrical engineering or a related field. The use of symbols and abbreviations is common in technical documents to convey complex information concisely. In summary, the content appears to be a snippet from a technical document related to the TI-DRV10987 motor driver, containing specifications and components related to the system. The document is highly technical and likely intended for individuals with expertise in electrical engineering or a closely related discipline.

DRV10987

www.ti.com.cn

ZHCSH31B –AUGUST 2017 –REVISED FEBRUARY 2018

8 Detailed Description

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 I

C 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

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

(UVLO) and for thermal shutdown.

The commutation control algorithm continuously measures the motor phase current and periodically measures

the V

supply voltage. The device uses this information for BEMF estimation, and the information is also

provided through the I

C register interface for debug and diagnostic use in the system, if desired.

A step-down regulator in buck mode 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 step-down 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 I

C 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 I

C 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.

Load

39 Ω

VREG

SWGND

5 V

47 µH

10 µF

VREG

SWGND

5 V

10 µF

DRV10987

www.ti.com.cn

ZHCSH31B –AUGUST 2017 –REVISED FEBRUARY 2018

Feature Description ( 接接下下页页)

Step-Down Regulator With External Inductor (Buck

Mode)

Step-Down Regulator With External Resistor (Linear

Mode)

图图 7. Step-Down Regulator Configurations

8.3.1.2 3.3-V and 1.8-V LDOs

The DRV10987 device includes a 3.3-V LDO and a 1.8-V LDO. The 1.8-V LDO is for internal circuits only. The

3.3-V LDO is mainly for internal circuits, but can also drive external loads not to exceed I

V3P3_MAX

. For example, it

can work as a pullup voltage for the FG, DIR, SDA, and SCL interfaces.

Both the V1P8 and V3P3 capacitors must be connected to GND.

8.3.2 Protection Circuits

8.3.2.1 Thermal Shutdown

The DRV10987 device has a built-in thermal shutdown function, which shuts down the device when the junction

temperature is more than T

SDN

˚C and recovers operating conditions when the junction temperature falls to T

SDN

–

SDN_HYS

˚C.

The OverTemp status bit (address 0x00, bit 15) is set during thermal shutdown. In addition to the thermal

shutdown function, there is a warning bit that is set whenever the device exceeds T

WARN

and is indicated by the

TempWarning bit of the FaultReg register (address 0x00, bit 14).

8.3.2.2 Undervoltage Lockout (UVLO)

The DRV10987 device has a built-in UVLO function block. The device is locked out when V

is below V

UVLO_F

and is unlocked when V

is above V

UVLO_R

. The hysteresis of the UVLO threshold is V

UVLO_HYS

. In addition to

the main supply, the step-down regulator, charge pump, and 3.3-V LDO all have undervoltage lockout monitors.

8.3.2.3 Overcurrent Protection (OCP)

The overcurrent protection function acts to protect the device if the current, as measured from the FETs, exceeds

the I

OC-limit

threshold. The overcurrent protection function protects the device in the event of a short-circuit

condition on the motor phases. A short-circuit condition includes phase shorts to GND, phase shorts to phase, or

phase shorts to V

. The DRV10987 device places the output drivers into a high-impedance state until the lock

time t

LOCK_OFF

has expired. The OverCurr status bit of the FaultReg register (address 0x00, bit 11) is set.

The DRV10987 device also provides software current-limit and lock-detection current-limit functions to protect the

device and motor (see Current Limits and Lock Detect and Fault Handling ).

Input Duty Cycle

1.5

Input Duty Cycle (%)

Output Duty

Cycle (%)

100

DutyCycleLimit[1:0], Reg0x95

00 - linear down to 5%, then holds at 5% until

duty command is 1.5 %; 0 % for duty command

below 1.5 %.

01 - linear down to 10%, then holds at 10% until

duty command is 1.5 %; 0 % for duty command

below 1.5 %.

DutyCycleLimit[1:0], Reg0x95

10 - linear down to 5%, then holds at 5% until

duty command is 1.5 %; 100 % for duty command

below 1.5 %.

11 - linear down to 10%, then holds at 10% until

duty command is 1.5 %; 100 % for duty command

below 1.5 %.

0 1.5

Input Duty Cycle (%)

Output Duty

Cycle (%)

DRV10987

ZHCSH31B –AUGUST 2017–REVISED FEBRUARY 2018

www.ti.com.cn

Feature Description ( 接接下下页页)

8.3.2.4 Lock

When the motor is blocked or stopped by an external force, lock protection is triggered, and the device stops

driving the motor immediately. After the lock release time t

LOCK_OFF

, the DRV10987 device resumes driving the

motor again. If the lock condition is still present, it enters the next lock protection cycle, and repeats until the lock

condition is removed. With this lock protection, the motor and device do not overheat or become damaged due to

the motor being locked (see Lock Detect and Fault Handling ).

During a lock condition the Status register indicates which of the locks has occurred.

8.3.3 Motor Speed Control

The DRV10987 device offers four methods for indirectly controlling the speed of the motor by adjusting the

output voltage amplitude. This can be accomplished by varying the supply voltage (V

) or by controlling the

speed command. The speed command can be controlled in one of three ways. The user can set the speed

command by adjusting either the PWM input (PWM in) or the analog input (Analog) or by writing the speed

command directly through the I

C serial port (I

C). The speed command is used to determine the PWM duty

cycle output (PWM_DCO) (see 图 9).

The PWM input (PWM in) can have a minimum duty cycle limit applied. DutyCycleLimit[1:0], accessible through

the I

C interface, allows the user to configure the minimum duty cycle behavior. This behavior is illustrated in 图

图图 8. Duty Cycle Profile

The speed command may not always be equal to the PWM_DCO because the DRV10987 device has the AVS

function (see Anti-Voltage Surge Function), the software current-limit function (see Software Current Limit), and

the closed-loop accelerate function (see Closed-Loop Accelerate) to optimize the control performance. These

functions can limit the PWM_DCO, which affects the output amplitude (see 图 9).

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