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MP6505 Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP6505 Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 12 page MP6505-SINGLE-PHASE BRUSHLESS DC MOTOR DRIVER MP6505 Rev.1.0 www.MonolithicPower.com 10 3/14/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 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: 6 OSC P 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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