871
Motor driver ICs BA6849FP / BA6849FP-Y / BA6849FM / BA6849FS
(2) Torque command
The R
NF pin voltage with respect to the torque command
(E
C) is as follows:
The I / O gain (G
EC) from the EC pin to the RNF pin (output
current) is determined by the R
NF detector resistor.
G
EC = 0.255 / RNF [A / V]
The torque limit current I
TL is given by:
I
TL = 0.35 / RNF [A]
(3) Reverse rotation detection function
The reverse detection circuit construction is shown in
Fig.11.
(1) Forward (E
C < ECR)
The phase relationship between the Hall input signals
H2
and H3
becomes as shown in Fig.9, and the re-
verse rotation detection circuit does not operate.
(2) Reverse (E
C > ECR)
The phase relationship between the signals H
2
and
H
3
is opposite that for forward operation, and the re-
verse rotation detection circuit operates. The output
goes OFF, and becomes open circuit.
