BA6859AFP View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BA6859AFP

Three-phase motor driver for CD-ROMs

ROHM Semiconductor 

Motor driver ICs

BA6858AFP / BA6858AFM / BA6859AFP /

BA6859AFP-Y / BA6859AFM / BA6859AFS

(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 = 0.35 / 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.13.

(1) Forward (EC < ECR)

The phase relationship between the Hall input signals

H2) and H3) becomes as shown in Fig.11, 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.

858

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