DRV8353FS datasheet(68/83 Pages) TI2

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10 Power Supply Recommendations

The DRV835xF family of devices are designed to operate from an input voltage supply (VM) range between 9 V

and 75 V. A 0.1-µF ceramic capacitor rated for VM must be placed as near to the device as possible. In addition,

a bulk capacitor must be included on the VM pin but can be shared with the bulk bypass capacitance for the

external power MOSFETs. Additional bulk capacitance is required to bypass the external half-bridge MOSFETs

and should be sized according to the application requirements.

10.1 Bulk Capacitance Sizing

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

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

amount of local capacitance depends on a variety of factors including:

• The highest current required by the motor system

• The power supply's type, capacitance, and ability to source current

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

• The acceptable supply voltage ripple

• Type of motor (brushed DC, brushless DC, stepper)

• The motor startup and braking methods

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

stays stable and high current can be quickly supplied.

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

appropriate sized bulk capacitor.

Local

Bulk Capacitor

Parasitic Wire

Inductance

Motor Driver

Power Supply

Motor Drive System

GND

IC Bypass

Capacitor

Figure 10-1. Motor Drive Supply Parasitics Example

DRV8350F, DRV8353F

SLVSFV1B – AUGUST 2018 – REVISED AUGUST 2021

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DRV8353FS Datasheet(PDF) 68 Page - Texas Instruments