DRV8860PWPR datasheet(30/45 Pages) TI2

30 / 45 page

Local

Bulk Capacitor

Parasitic Wire

Inductance

Motor

Driver

Power Supply

Motor Drive System

GND

IC Bypass

Capacitor

DRV8860, DRV8860A

SLRS065E – SEPTEMBER 2013 – REVISED NOVEMBER 2015

www.ti.com

10 Power Supply Recommendations

The DRV8860 is designed to operate from an input voltage supply (VM) range between 8 and 38 V. A 0.1-µF

ceramic capacitor rated for VM must be placed as close as possible to the VM pin. In addition to the local

decoupling cap, additional bulk capacitance is required and must be sized accordingly to the application

requirements.

Bulk capacitance sizing is an important factor in motor drive system design. It is dependent on a variety of factors

including:

•

Type of power supply

•

Acceptable supply voltage ripple

•

Parasitic inductance in the power supply wiring

•

Type of load

•

Load startup current

The inductance between the power supply and motor drive system will limit the rate current can change from the

power supply. If the local bulk capacitance is too small, the system will respond to excessive current demands or

dumps from the motor with a change in voltage. The user should size the bulk capacitance to meet acceptable

voltage ripple levels.

The datasheet generally provides a recommended value but system level testing is required to determine the

appropriate sized bulk capacitor.

Figure 38. Example Setup of Motor Drive System with External Power Supply

10.1 Power Supply and Logic Sequencing

There is no specific sequence for powering-up the DRV8860. It is okay for digital input signals to be present

before VM is applied. After VM is applied to the DRV8860, it begins operation based on the status of the control

pins.

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