FAN8420D3 datasheet(8/18 Pages) FAIRCHILD

8 / 18 page

FAN8420D3

Rev. 1.0.1

Oct.. 2000.

Application Information

1. Torque Control & Output Current Control

• 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.

−−−−

Torque AMP

ECR

ECR-EC

Current Sense AMP

TSD

Gain

Controller

Driver

RCS

VCS

−

Forward

Ecoff+

Ecoff-

Reverse

Current

[mA]

ECR -EC

Rotation

ECR > Ec

Forward rotation

ECR < Ec

Stop after detecting re-

verse rotation

The input range of ECR and EC is 0.2 V ~ 3.3 V ( RNF = 0.5[

Ω] )

500

700

50mV

-50mV

0.71[A/V]

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