Texas Instruments MCT8329A Handleiding

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MCT8329A High Speed Sensorless Trapezoidal Control Three-phase BLDC Gate

Driver

1 Features

•Three-phase BLDC gate driver with integrated

sensorless motor control algorithm

–Code-free high speed Trapezoidal Control

–Supports up to 3 kHz (electrical frequency)

–Very fast startup time (<50 ms)

–Fast Deceleration (<150 ms)

–Supports 120° or 150° modulation to improve

acoustic performance

–Forward and reverse windmilling support

–Analog, PWM, freq. or I

2

C based control input

–Configurable motor startup and stop options

–Optional closed loop speed or power control,

open loop voltage control

–5-point configurable reference profile support

–Anti-voltage surge prevents overvoltage

–Variable monitoring through DACOUT

•65-V Three phase half-bridge gate driver

–Drives 3 high-side and 3 low-side N-Channel

MOSFETs, 4.5 to 60-V operating voltage

–Supports 100% PWM duty cycle

–Bootstrap based gate driver architecture

–1-A/2-A Maximum peak source/sink current

•Integrated current sense amplifier

–Adjustable gain (5, 10, 20, 40 V/V)

•Low power sleep mode

–5-µA (maximum) at V

PVDD

= 24-V, T

A

= 25°C

•Speed loop accuracy: < 3% with internal clock

•Supports up to 100-kHz PWM frequency

•Accurate LDO (AVDD) 3.3-V ±3%, 50-mA support

with AVDD connected to VREG

•Independent driver shutdown path (DRVOFF)

•Spread spectrum for EMI mitigation

•Suite of Integrated protection features

–Supply undervoltage lockout (UVLO)

–Motor lock detection (3 different types)

–Overcurrent protection (OCP)

–Thermal shutdown (TSD)

–Fault condition indication pin (nFAULT)

–Optional fault diagnostics over I

2

C interface

2 Applications

•Brushless-DC (BLDC) Motor Modules

•Cordless Vacuum Cleaners

•HVAC Blowers and Ventilators

•Appliance Fans and Pumps

•Cordless Garden and Power Tools, Lawnmowers

3 Description

The MCT8329A provides a single-chip, code-free

sensorless trapezoidal solution for applications

requiring high speed operation or very fast startup

time for three phase brushless-DC motors. The device

provide three half-bridge gate drivers, each capable

of driving high-side and low-side N-channel power

MOSFETs. The device generates correct gate drive

voltages using an internal charge pump and enhances

the high-side MOSFETs using a bootstrap circuit. A

trickle charge pump is included to support 100% duty

cycle. The gate drive architecture supports peak gate

drive currents up to 1-A source and 2-A sink. The

MCT8329A can operate from a single power supply

and supports a wide input supply range of 4.5 to 60 V.

Sensorless trapezoidal control is highly configurable

through register settings in a non-volatile EEPROM

(MCT8329A1I) ranging from motor start-up behavior

to closed loop operation, which allows the device

to operate stand-alone once it has been configured.

Motor current is sensed using an integrated current

sensing amplifier supporting single external shunt

resistor. The device receives a speed command

through a PWM input or analog voltage or variable

frequency square wave or I

2

C command. There are a

large number of protection features integrated into the

MCT8329A, intended to protect the device, motor, and

system against fault events.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

MCT8329A1IREERVQFN (36)5.00 mm × 4.00 mm

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

the end of the data sheet.

MCT8329A

3-Phase Pre-Driver

LDO Regulator

Integrated Current

Sense Ampli



er

EEPROM

Sensorless

Trap

DIRECTION

BRAKE

I

2

C

Op



onal during

opera



on; I

2

C speed,

diagnos



cs, or on-

the-



y con



gura



on

PWM, analog,frequency

or commanded over I

2

C

SPEED

FG

Speed feecback

nFAULT

DACOUTx

Real-



me variable

monitoring, 12-bit DAC

A

B

C

4.5 to 60-V

A

LDO out

3.3-V, up to 80-mA

Bootstrap Architecture

Charge pump

N-Channel

MOSFETs

Gate

Drive

Current

sense

Simplified Schematic

MCT8329A

SLLSFQ3 – JANUARY 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.

Product specificaties