MP6505DM datasheet(10/12 Pages) MPS

10 / 12 page

MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER

MP6505 Rev.1.0

www.MonolithicPower.com

3/14/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

APPLICATION INFORMATION

Selecting the Input Capacitor

The input capacitor absorbs excess armature

inductor energy with every commutation. For

typical applications, select CIN≥10µF to provide a

margin of safety for input OVP. Motors with larger

armature inductors require larger input capacitors.

Setting the Frequency

For most applications, use a 100pF capacitor for

the CP capacitor to set the frequency to 30kHz.

fCOSC is determined by:

OSC

f3 10 / C (Hz)





Connecting the Motor

Figure 3 shows that the OUT1 and OUT2

connect to the motor armature: When VIN+

exceeds VIN-, SW1 and SW4 activate and current

flows from OUT1 to OUT2; When VIN- exceeds

VIN+, SW2 and SW3 activate and current flows

from OUT2 to OUT1. The opposing current

directions generate opposing polarities in the

armature

winding.

For

most

applications,

carefully connect OUT1 and OUT2 to the motor

terminators according to the Hall sensor setting

position.

Incorrect

connections

will

cause

abnormal motor function.

Figure 3: Power Stage

DESIGN EXAMPLE

Below is an example design that follows the

application guidelines for the given specifications:

VIN

4.5V to 16V

IOUT(Max)

400mA

fCOSC

30kHz

Figure 4 shows a detailed application schematic.

For more applications, please refer to the related

Evaluation Board Data Sheets.

Figure 4: Detailed Application Schematic

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