DRV8860_16 Datasheet, PDF (30/41 Pages) Texas Instruments – 8-Channel Serial Interface Low-Side Driver

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.
Power Supply
Parasitic Wire
Inductance
Motor Drive System
VM
+
+
Motor
±
Driver
GND
Local
Bulk Capacitor
IC Bypass
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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