DRV10866_15 Datasheet, PDF (10/22 Pages) Texas Instruments – 5V, 3Phase, Sensorless BLDC Motor Driver

DRV10866
SBVS206A – NOVEMBER 2012 – REVISED MARCH 2015
8 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
DRV10866 only requires three external components. The device needs a 2.2-μF or higher ceramic capacitor
connected to VCC and ground for decoupling. During layout, the strategy of ground copper pour is very important
to enhance the thermal performance. For two or more layers, use eight thermal vias. Refer to Layout Example for
an example of the PCB layout. If there is no COM pin on the motor, one can be simulated. Use three resistors
connected in a wye formation, one connected to U, one to V, and one to W. Connect the resistor ends opposite
of the phases together. This center point is COM. To find the proper resistor value, start with a value of 10 kΩ
and continue to decrease by 1 kΩ until the motor runs properly.
8.2 Typical Application
100 kΩ
1 FG
2 COM
PWM 10
CS 9
3.8 kΩ
PWM_IN
V_CC
3 VCC
FGS 8
2.2 µF
4U
V7
5 GND
W6
M
Figure 4. Typical Application Schematic
8.2.1 Design Requirements
For this design example, use the parameters listed in Table 2 as the input parameters.
Table 2. Recommended Application Range
Motor voltage
VCC capacitor
Operating current
Absolute max current
Place as close to the pin as possible
Running with normal load at rated speed
During start-up and locked motor condition
MIN
TYP
1.6
2.2
MAX
5.5
500
650
UNIT
V
µF
mA
mA
10
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