BA6849 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6849

3-phase motor driver for CD-ROMs

ROHM Semiconductor 

Motor driver ICs

BA6849FP / BA6849FP-Y / BA6849FM / BA6849FS

(2) Torque command

The RNF pin voltage with respect to the torque command

(EC) is as follows:

(3) Reverse rotation detection function

The I / O gain (GEC) from the EC pin to the RNF pin (output

current) is determined by the RNF detector resistor.

GEC = 0.255 / RNF [A / V]

The torque limit current ITL is given by:

ITL = 0.35 / RNF [A]

The reverse detection circuit construction is shown in

Fig.11.

(1) Forward (EC < 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 (EC > ECR)

The phase relationship between the signals H2) and

H3) is opposite that for forward operation, and the re-

verse rotation detection circuit operates. The output

goes OFF, and becomes open circuit.

871

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