DRV10983-Q1 Datasheet, PDF (26/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

DRV10983-Q1
SLVSD14 – JUNE 2017
www.ti.com
Clock
Drive
Current
IPDclk
VW
WV
UV
VU
WU
UW
U
N
V
S
W
IPDCurrThr
Search the Minimum Time
Permanent
Magnet Position
Saturation Position of the
Magnetic Field
Smallest
Inductance
Figure 17. IPD Function
Minimum
Time
8.4.3.5.2.2 IPD Release Mode
Two options are available for stopping the voltage applied to the motor when the current threshold is reached. If
IPDRlsMd = 0, the recirculate mode is selected. The low-side (S6) MOSFET remains on to allow the current to
recirculate between the MOSFET (S6) and body diode (S2) (see Figure 18). If IPDRlsMd = 1, the tri-state mode
is selected. Both the high-side (S1) and low-side (S6) MOSFETs are turned off and the current flies back across
the body diodes into the power supply (see Figure 19).
In the high-impedance state, the phase current has a faster settle-down time, but that could result in a surge on
V_CC. Manage this with appropriate selection of either a clamp circuit or by providing sufficient capacitance
between V_CC and GND. If the voltage surge cannot be contained and if it is unacceptable for the application, then
select the recirculate mode. When selecting the recirculate mode, select the IPDClk[1:0] bits to give the current in
the motor windings enough time to decay to 0.
S1
S3
S5
U1
M
S2
S4
S6
S1
S3
S5
U1
M
S2
S4
S6
Driving
Brake (Recirculate)
Figure 18. IPD Release Mode 0
26
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