Learn More About Brushed DC Motors With The BOOST-DRV8848

Other Parts Discussed in Post: BOOSTXL-DRV8301, BOOST-DRV8711, BOOST-DRV8848

The number of different motors in the world is mind boggling. We showed you some of the more exotic ones in a previous post, but this barely scratches the surface.

Whatever your motor type, we want you to get your motor up and running without all the fuss of complicated motor system design. Although we can’t cover every motor out there, we are doing our best to catch the majority. One of the ways we have been doing this is by introducing a series of Motor Driver BoosterPacks (BOOSTXL-DRV8301, BOOST-DRV8711) for rapid prototyping and evaluation on TI’s LaunchPad ecosystem.

Figure 1: BOOSTXL-DRV8301 (BLDC)

Figure 2: BOOST-DRV8711 (Stepper)

Now, we’re rounding out the family with the BOOST-DRV8848, a dual brushed DC motor BoosterPack featuring the DRV8848.

Figure 3: BOOST-DRV8848 (Brushed DC)

The BOOST-DRV8848 is a 4-18V brushed DC motor drive stage based on our new DRV8848. This design contains everything needed to drive dual brushed DC motors with support for a parallel mode to double the output current capability to a single brushed DC motor.

Figure 4: BOOST-DRV8848 pinout

Figure 5: BOOST-DRV8848 schematic

The BOOST-DRV8848 utilizes the DRV8848 to minimize BOM component count for your motor drive system. The DRV8848 requires only two external capacitors (C1 and C3) for operation. The low value filtering capacitor (C2) and current sense resistors (R3 and R4) are optional depending on your system requirements. The DRV8848 integrates the dual H-bridges, digital control logic, and a suite of protection features including power supply undervoltage, overcurrent and thermal shutdown.

The BOOST-DRV8848 allows you to control each H-bridge through the AIN/BIN signals. The AIN and BIN signals determine whether the H-bridge is high impedance, driving forward/reverse or driving low. The onboard potentiometer allows you to adjust the DRV8848 VREF voltage. The VREF voltage directly sets the current regulation limit of the DRV8848. You can refer to the DRV8848 datasheet for more details on the implementation of the current regulation scheme. The nSLEEP signal allows you to place the DRV8848 in a low current sleep mode and nFAULT indicates when the device is in a fault condition. Two terminal block headers allow you to easily connect your external power supply and motors.

All of these combine to create an intelligent motor drive system that fits in the palm of your hand!

For more information, you can visit the TI Motor Driver Forums or check out the TI Motor Drive & Control Home Page. If you would like to Build You Own BoosterPack, check out ti.com/byob!