MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER

MP6505 Rev.1.0

www.MonolithicPower.com

10

3/14/2012

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© 2012 MPS. All Rights Reserved.

APPLICATION INFORMATION

Selecting the Input Capacitor

The input capacitor absorbs excess armature

inductor energy with every commutation. For

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

6

OSC

P

f3 10 / C (Hz)





Connecting the Motor

Figure 3 shows that the OUT1 and OUT2

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:

4.5V to 16V

400mA

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