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BA6859AFP Datasheet(PDF) 11 Page - Rohm

Part # BA6859AFP
Description  Three-phase motor driver for CD-ROMs
PDF  15 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA6859AFP Datasheet(HTML) 11 Page - Rohm

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858
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IC
BA6858AFP / BA6858AFM / BA6859AFP /
Motor driver ICs
BA6859AFP-Y / BA6859AFM / BA6859AFS
(2)
Torque command
The RNF pin voltage with respect to the torque command (EC) is as follows:
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)
(3)
Reverse rotation detection function
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.



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