DRV11873 Datasheet, PDF (9/16 Pages) Texas Instruments – 12-V, 3-PHASE, SENSORLESS BLDC MOTOR DRIVER

DRV11873
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APPLICATION INFORMATION
SLWS237 – NOVEMBER 2012
DRV11873 only requires 5 external components. A 10-µF or higher ceramic capacitor connected to V_CC and
ground is needed for decoupling purpose. During layout, the strategy of ground copper pour is very important to
enhance the thermal performance. For two or more layers, eight thermal vias are needed. Refer to Figure 1 for
an example of PCB layout. For high speed motors (FS = 1), which need higher start up current, three Schottkey
diodes are needed between phases U, V, W and ground. Each diode anode terminal needs to be connected to
ground and cathode terminal needs to be connected to either U or V or W.
Figure 1. PCB Layout
Copyright © 2012, Texas Instruments Incorporated
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