W49 datasheet(8/11 Pages) CERAMATE

8 / 11 page

WAFER WIN

W49

3-Phase Motor Driver for CD-ROMs

* All specs and applications shown above subject to change without prior notice.

1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU ,

TAOYUAN, TAIWAN

Email: server@ceramate.com.tw

Tel:886-3-3214525

Http: www.ceramate.com.tw

Fax:886-3-3521052

Page 8 of 11

Rev 1.1 May.9, 2002

(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 = 0.255 / 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.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.

W49 Datasheet(PDF) 8 Page - Ceramate Technical