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MCF8315A Sensorless Field Oriented Control (FOC) Integrated FET BLDC Driver

1 Features

•Three-phase BLDC motor driver with integrated

sensorless motor control algorithm

–Code-free Field Oriented Control (FOC)

–Analog, PWM and freq. based speed input

modes: available only when MCF8315A is

configured as a standby device (DEV_MODE

= 0b)

–I

2

C based speed input mode: available in both

sleep (DEV_MODE = 1b) and standby devices

(DEV_MODE = 0b).

–Offline motor parameters measurement with

Motor Parameter Extraction Tool (MPET)

–5-point configurable speed profile support

–Windmilling support through forward

resynchronization and reverse drive

–Anti-voltage surge (AVS) protection

–Improved acoustic performance with automatic

dead time compensation

•4.5- to 35-V operating voltage (40-V abs max)

•High output current capability: 4-A peak

•Low MOSFET on-state resistance

–R

DS(ON)

(HS + LS) at T

A

= 25°C : 240-mΩ (typ.)

•Low power sleep mode: Refer Table 7-6

–5-µA (maximum) at V

VM

= 24-V, T

A

= 25°C

•Speed loop accuracy: 3% with internal clock and

1% with external clock reference

•Supports up to 75-kHz PWM frequency for low

inductance motor support

•Does not require external current sense resistors;

uses built-in current sensing

•Built-in 3.3-V, 20-mA LDO regulator

•Built-in 3.3-V/5-V, 170-mA buck regulator

•Dedicated DRVOFF pin to disable (Hi-Z) outputs

•Spread spectrum and slew rate for EMI mitigation

•Suite of integrated protection features

–Supply under voltage lockout (UVLO)

–Supply over voltage protection (OVP)

–Motor lock detection (5 different types)

–Over current protection (OCP)

–Thermal warning and shutdown (OTW/TSD)

–Fault condition indication pin (nFAULT)

–Optional fault diagnostics over I

2

C interface

2 Applications

•Brushless-DC (BLDC) Motor Modules

•Residential and Living Fans

•Air Purifiers and Humidifier Fans

•Washer and Dishwashers Pumps

•Automotive Fan and Blowers

•CPAP Machines

3 Description

The MCF8315A provides a single-chip, code-free

sensorless FOC solution for customers driving speed-

controlled 12- to 24-V brushless-DC motors (BLDC)

or Permanent Magnet Synchronous motor (PMSM) up

to 4-A peak current. The MCF8315A integrates three

½-bridges with 40-V absolute maximum capability and

a low R

DS(ON)

of 240 mΩ (high-side + low-side FETs).

MCF8315A integrates power management circuits

including an voltage-adjustable buck regulator (3.3 V /

5 V, 170-mA) and LDO (3.3 V / 20 mA) that can be

used to power external circuits.

The FOC algorithm configuration can be stored in

non-volatile EEPROM, which allows the device to

operate stand-alone once it has been configured.

The device receives a speed command through a

PWM input, analog voltage, variable frequency square

wave or I

2

C command. There are a large number

of protection features integrated into the MCF8315A,

intended to protect the device, motor, and system

against fault events.

Note

TI recommends adding a 200-ms delay

after device power-up or wake-up from

sleep state before giving a speed

command.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

MCF8315A1VVQFN (40)7.00 mm × 5.00 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

Documentation for reference:

•Refer MCF8315A tuning guide

•Refer to the MCF8315A EVM GUI

MCT8315A

MOSFETs

Buck/LDO Regulator

Integrated Current Sensing

EEPROM

Sensorless

Trap

DIRECTION

BRAKE

I

2

C

Optional during operation for

I

2

C speed, diagnostics, or on-

the-fly configuration

PWM, analog, frequency or

commanded over I

2

C

SPEED

FG

Speed feecback

nFAULT

A

B

C

4.5 to 35 V (40 V abs max)

4 A peak output current,

typically 12 to 24 V

Buck out

3.3 or 5.0 V, up to 170 mA

A

LDO out

3.3 V, up to 20 mA

B

C

b

d

β

α

Simplified Schematic

MCF8315A

SLLSFP6A – DECEMBER 2022 – REVISED APRIL 2023

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspecifikationer