DRV10975_15 Datasheet, PDF (45/57 Pages) Texas Instruments – DRV10975 12-V, Three-Phase, Sensorless BLDC Motor Driver

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10 Application and Implementation
DRV10975
SLVSCP2 – JANUARY 2015
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.
10.1 Application Information
DRV10975 is used in sensorless 3-phase BLDC motor control. The driver provides a high performance, high
reliability, flexible and simple solution for appliance fan, pump, and HVAC applications. The following design
shows a common application of the DRV10975.
10.2 Typical Application
0.1 µF
1 _VCP
3.3 V/5 V
0.1 µF ^{2 CPP}
3 _CPN
39
4 SW
5 SWGND
1 µF
6 VREG
7 V1P8
1 µF
8 GND
9 V3P3
10 ^SCL
11 ^SDA
Interface to
12 ^FG
Configuration
VCC ²⁴
VCC ²³
W ²²
W 21
V 20
V 19
U 18
U 17
PGND 16
PGND ₁₅
DIR ₁₄
SPEED ₁₃
VCC
10 µF
M
Figure 39. Typical Application Schematic
10.2.1 Design Requirements
Table 10 provides design input parameters and motor parameters for system design.
Table 10. Recommended Application Range
Motor voltage
Motor velocity constant
Phase to phase, measured while motor is coasting
Motor resistance
1 phase, measured ph-ph and divide by 2
Motor electrical constant
1 phase; inductance divided by resistance, measured ph-ph is
equal to 1 ph
Operating closed loop speed Electrical frequency
Operating current
PGND, GND
Absolute maximum current During start-up or lock condition
MIN
6.5
0.001
0.3
100
1
0.1
TYP MAX UNIT
12
18 V
1.4 V/Hz
12 Ω
5000 µs
1000 Hz
1.5 A
2A
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