DRV10974: Driver

Hi Arvinth,

Thank you for your post! One of the members of the team will respond to you hopefully by the end of next week, however most of the team is out of office right now for the holidays.

Regards,

Anthony Lodi

Hello Anthony, 

Thank you for your update. 

Hi Aravinth,

Thanks for your interest in TI BLDC controllers.

I understand your application is for Fuel Pump.  I will first clarify your list of questions and I will provide another device reference for Fuel Pump application

1: Can we drive this IC with analog input for speed control without microcontroller or any external PWM input?

This device pin "PWM" can be driven with Analog or PWM which has built in auto detect for PWM or Analog

2: As we don’t need microcontroller , can we keep FG pin (motor speed feedback) floating or unconnected?

FG pin has internal pullup to 3.3V (20kOhm). If any higher voltage pull up required then provide through a resistor to limit current.

3: What is role of ADV PIN (lead angle select)? Can we keep it floating?

Motor commutation point can be adjusted to improve the efficiency. This is used to align Phase current with BEMF very well so that effective torque is delivered with lesser current.

You can refer to the data for range of resistor value to provide commutation advance time from 10us to 1000us. If it is left open device uses longest commutation time. This has to be tuned otherwise performance will be poor and thereby causing unreliable controls.

3: Is there evaluation board available for this IC? How can we get this?

EVM available for this device. You can visit the link for more details DRV10974EVM | Buy TI Parts | TI.com

4: Is there any other similar or better 3-Phase Brushless Sinusoidal Sensor less Motor Driver IC available with below requirements?

1. Voltage rating 18V, current 1.5A, integrated MOSFET.
2. 3-Phase Brushless Sinusoidal Sensor less Motor Driver IC
3. without CAN/LIN/SPI/I2C communication, which is cheaper, simpler and with minimal pins.
4. Application: BLDC motor driver for fuel pump.

You can refer to MCT8315A (MCT8316A data sheet, product information and support | TI.com) .  This device requires initial tuning through I2C  and once motor is well tuned we can burn the configuration to internal EEPROM. After that we don't need I2C and speed can be controlled through PWM or Analog.

Please check for startup time, wide operating conditions for your application. Example, MCT8315A can do fast startup in less than 50ms from zero speed to max speed which is essential for fuel pump applications.

Thanks and Best Regards,

Venkatadri S

Hello Venkatadri,

Thanks, you for response!

Few more questions we have to ask regarding suggested. 

MCT8315A part is automotive grade? if not automotive grade please suggest AEC-100 grade.

MCT8315A part can drive fuel pump as per our voltage and current requirement. But we have below query regarding this part as we want to reduce cost and complexity. 

1: Can we operate it without microcontroller and I2C communication? Because for speed control method selection we need to write in EEPROM via I2C communication?

2: What is default speed control method (analog or PWM) once IC is powered without any EEPROM setting? Is there any way to set analog speed control method without using microcontroller and I2C communication even once?

3: What is the purpose of DACOUTx pin? Can we keep this floating or disconnected?

4: Is evaluation board available for this part and how to order it?

5: What is cost for this IC for 500, 1K, 5K volume?

6: This IC has some extra functions like BUCK Out, LDO, Brake, nFault, I2C (Yellow highlighted in below attached image) à can we keep them floating or pulled up/pulled down as we don’t require these functions without affecting motor driving operation?