Is drv8332 sufficient for 350W 48V hubmotor?

Sungbin Suh

Other Parts Discussed in Thread: DRV8332, DRV8302, CSD18536KCS

Hi. I am going to make an electric tricycle for my project.

I already designed drv8332 schematic for the hub motor 350W 48V.

I believed it will be sufficient for my motor specs. Recently, I started to doubt if it won't get over heat with the motor spec.

By calculations, there is about 7.29A continuous with full load(350W) in the circuit. As the drv8332 data sheet, they cover up to 8A continuous.

it is almost 0.7A less than maximum current. However, (by the way, I won't drive my vehicle over 90% Throttle(<315W).

Technically, it will be about 6.5A continuous. is it safe?

Or do i have to go with drv8302 + CSD18536KCS (mosfets) due to heat dissipation?

CSD18536KCS

over 8 years ago

0 Rick Duncan over 8 years ago

TI__Guru** 114905 points

Hi Sungbin,

The DRV8302 plus MOSFETS would be a better choice in my opinion.

The reason is that the system operation depends on the placement of the DRV8332 and the amount of heatsink available. You are approaching the recommended limits of operation. These limits do not consider heat sources from the surrounding devices, such as the motor, additional circuits, etc. If there are local heat sources that increase the device ambient this could make operation marginal.

0 Sungbin Suh over 8 years ago in reply to Rick Duncan

Prodigy 30 points

Thank you for replying.

Then, What if I use 250W 48V (5A), would it be safe? I probably use less than that though.

0 Rick Duncan over 8 years ago in reply to Sungbin Suh

TI__Guru** 114905 points

Hi Sungbin,

5A should work without issues. As mentioned the position of the DRV8332 and other heat sources may have an impact.

0 Sungbin Suh over 8 years ago in reply to Rick Duncan

Prodigy 30 points

Hi Rick,

Thank you for replying. Would you be able to supply me with a Eagle CAD library of DRV8332? I attempted to make my own library but unfortunately something with the design is preventing connections. Also, I already downloaded one library that TI provided and our motor driver was not in there.

~Sungbin

0 Rick Duncan over 8 years ago in reply to Sungbin Suh

TI__Guru** 114905 points

Hi Sungbin,

A generic schematic and footprint are available under the Quality and Packaging tab of the product folder.

The direct link is LINK

Look for the .bxl file and instructions to the right.

Motor drivers

Motor drivers forum

Is drv8332 sufficient for 350W 48V hubmotor?