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DRV8305-Q1_16 Datasheet, PDF (19/54 Pages) Texas Instruments – Three-Phase Automotive Gate Driver
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DRV8305-Q1
SLVSD12A – MAY 2015 – REVISED MARCH 2016
The method of freewheeling can be selected through an SPI register (COMM_OPTION). Diode freewheeling
is when the phase current is carried by the body diode of the external power MOSFET during periods when
the MOSFET is reverse biased (current moving from source to drain). In active freewheeling, the power
MOSFET is enabled during periods when the MOSFET is reverse biased. This allows the system to improve
efficiency due to the typically lower impedance of the MOSFET conduction channel as compared to the body
diode. Table 4 shows the truth table for active freewheeling. Table 5) shows the truth table for diode
freewheeling.
STATE
AB
AB_CB
CB
CB_CA
CA
CA_BA
BA
BA_BC
BC
BC_AC
AC
AC_AB
Align
Stop
INLA:INHB:INLB:INHC
0110
0101
0100
1101
1100
1001
1000
1011
1010
0011
0010
0111
1110
0000
Table 4. 1-PWM Active Freewheeling
GHA
PWM
PWM
LOW
LOW
LOW
LOW
LOW
LOW
LOW
PWM
PWM
PWM
PWM
LOW
GLA
!PWM
!PWM
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
!PWM
!PWM
!PWM
!PWM
LOW
GHB
LOW
LOW
LOW
LOW
LOW
PWM
PWM
PWM
PWM
PWM
LOW
LOW
LOW
LOW
GLB
HIGH
HIGH
HIGH
HIGH
LOW
!PWM
!PWM
!PWM
!PWM
!PWM
LOW
HIGH
HIGH
LOW
GHC
LOW
PWM
PWM
PWM
PWM
PWM
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
GLC
LOW
!PWM
!PWM
!PWM
!PWM
!PWM
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
STATE
AB
AB_CB
CB
CB_CA
CA
CA_BA
BA
BA_BC
BC
BC_AC
AC
AC_AB
Align
Stop
INLA:INHB:INLB:INHC
0110
0101
0100
1101
1100
1001
1000
1011
1010
0011
0010
0111
1110
0000
Table 5. 1-PWM Diode Freewheeling
GHA
PWM
PWM
LOW
LOW
LOW
LOW
LOW
LOW
LOW
PWM
PWM
PWM
PWM
LOW
GLA
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
LOW
GHB
LOW
LOW
LOW
LOW
LOW
PWM
PWM
PWM
PWM
PWM
LOW
LOW
LOW
LOW
GLB
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
LOW
GHC
LOW
PWM
PWM
PWM
PWM
PWM
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
GLC
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
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