DRV8462: DRV8432 replacement?

Also we have only  PWM control from the MCU to control the H Bridge , not sure  applying PWM to  the HW interface M0 & M1 of DRV8462 would work.

Hi Steve,

Steve Widener said:

Is DRV8462 a replacement option for DRV8432?

Correct, the DRV8462 (in DDV package with exposed thermal PAD on top of IC) can replace the DRV8432.

Steve Widener said:

I feel since DRV8462 is an exclusive stepper motor driver, it wouldn’t work well for Brushed DC motor control.  Is this correct?

DRV8462 is mainly for stepper driving but it has a sister device (DRV8962 (also available in DDV package)) which is a brushed DC driver. The DRV8962 is a quad half-bridge driver with a dedicated input control pin for each half-bridge. If you only have one MCU PWM channel, I can recommend other devices with simpler control schemes that only require one PWM signal. In order to narrow down the options, can you answer the following questions:

What is the load max current and voltage?

Max PWM switching frequency?

Any specific features?

Regards,

Pablo Armet

There are numerous posts recommending replacements for the DRV8432. Perhaps TI could offer a technical document outlining how to upgrade the DRV843. Can I include our requirements in this post?

1. What is the maximum current and voltage for the load? The load can handle a maximum of 8A RMS and 25A (or 21A) peak, and the voltage rating is between 15V and 30V.

2. What is the maximum PWM switching frequency? We control the voice coil using C2000 and an FPGA, requiring a fast and smooth control. We prefer a specification similar to the DRV8432, with a PWM frequency of 500KHz, a dead time of 5ns, and a propagation time of 38ns.

3. We prefer integrated current sensing for current limit and short circuit protection. Direct half-bridge control with manually tuned fast decay and slow decay, as well as brake functionality, is also desired.

Pablo,

Here are the needs:

Max load around 8A (paralleling 2 half bridges) . We are replacing DRV8432 , so max operating voltage needed 52VDC (same as DRV8432).

Dual full bridge needed and ability to configure full bridge in parallel operation mode.

Max frequency same as drv8432 500Khz.

Could you please let me know with what hardware configuration would be needed for DRV8462 to  drive brushed DC motor.

We have only 2 PWM access to the driver from the MCU. No SPI access.  

Best Regards,

Steve

The application is brushed dc motor.

Hello Steve,

Actually on second thought, the DRV8962 in DDV package will be the better option.

The DRV8962 matches all of your need besides the max frequency. The max frequency is 250kHz. Do you plan to drive at exactly 500kHz?

Regards,

Pablo Armet

Hi Pablo/Steve, 

Does Paralleling outputs increase the drive current to 20A.

Regards,
Arun

Thanks Pablo