KA3016D Ver la hoja de datos (PDF) - Fairchild Semiconductor

Número de pieza

componentes Descripción

Fabricante

KA3016D

SPINDLE MOTOR DRIVER

Fairchild Semiconductor 

CD-ROM PRODUCTS

KA3016D

APPLICATION INFORMATION

1. TORQUE CONTROL & OUTPUT CURRENT CONTROL

Torque AMP

ECR

+

−

EC

VM

+

VM

VCS

RCS

−

ECR-EC

Current Sense AMP

−

+

TSD

Gain

Controller

IO

Driver

M

• By amplifying the voltage difference between EC and ecr from servo IC, the torque sense amp produces the

input (VAMP) for the current sense amp.

• The output current (IO) is converted into the voltage (VCS) through the sense resistor (RCS) and compared with

the VAMP. By the negative feedback loop, the sensed output voltage, VCS is equal to the input VAMP.

Therefore, the output current (IO) is linearly controlled by the input VAMP.

• As a result, the signals, EC and ECR can control the velocity of the Motor by controlling the output current (IO)

of the Driver.

• The range of the torque voltage is as shown below.

VRNF

[V]

Reverse

Forward

Ecoff− Ecoff+

3 mV

−50mV

0

0.51[A/V]

50mV

The input range of ECR, EC is 0.2V ~ 4V.

ECR > EC

ECR < EC

Rotation

Forward rotation

Stop after detecting

reverse rotation

ECR -EC

MIC-99D001

7

January 1999

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