DRV8461SPWPR datasheet(106/117 Pages) TI

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10 Power Supply Recommendations

• The DRV8461 is designed to operate from an input voltage supply (VM) from 4.5 V to 65 V.

• A 0.01-µF ceramic capacitor rated for VM must be placed close to the VM pins of DRV8461.

• In addition, a bulk capacitor must be included on VM.

10.1 Bulk Capacitance

Having appropriate local bulk capacitance is an important factor in motor drive system design. It is generally

beneficial to have more bulk capacitance, while the disadvantages are increased cost and physical size.

The amount of local capacitance needed depends on a variety of factors, including:

• The highest current required by the motor system

• The power supply’s capacitance and ability to source current

• The amount of parasitic inductance between the power supply and motor system

• The acceptable voltage ripple

• The type of motor used (brushed DC, brushless DC, stepper)

• The motor braking method

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. When adequate bulk capacitance is used, the motor voltage

remains stable and high current can be quickly supplied.

The data sheet generally provides a recommended value, but system-level testing is required to determine the

appropriate sized bulk capacitor.

The voltage rating for bulk capacitors should be higher than the operating voltage, to provide margin for cases

when the motor transfers energy to the supply.

Local

Bulk Capacitor

Parasitic Wire

Inductance

Motor

Driver

Power Supply

Motor Drive System

GND

IC Bypass

Capacitor

Figure 10-1. Example Setup of Motor Drive System With External Power Supply

10.2 Power Supplies

The DRV8461 needs only a single supply voltage connected to the VM pins to operate properly.

• The VM pin provides the power supply to the H-Bridges.

• An internal voltage regulator provides a 5V supply (DVDD) for the digital and low-voltage analog circuitry. The

DVDD pin is not recommended to be used as a voltage source for external circuitry.

• An optional external low-voltage supply can be connected to the VCC pin to power the internal circuitry. A

0.1-µF decoupling capacitor should be placed close to the VCC pin to provide a constant voltage during

transient.

DRV8461

SLOSE98 – DECEMBER 2022

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