KA3011 データシートの表示（PDF） - Fairchild Semiconductor

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KA3011

3-Phase BLDC Motor Driver

Fairchild Semiconductor 

Application Information

1. TORQUE & OUTPUT CURRENT CONTROL

KA3011BD

Torque AMP

ECR +

−

EC

VM

+

VM

VCS RCS

−

Current Sense AMP

IO

−

+

ECR-EC

Gain

Controller

Driver

M

TSD

• 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]

3 mV

Reverse

Forward

Ecoff− Ecoff+

−50mV

0

0.51[A/V]

50mV

ECR > EC

ECR < EC

Rotation

Forward rotation

Stop after detecting

reverse rotation

ECR -EC

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

2. SHORT BRAKE

VCC

ON

OFF

18

50kΩ

30kΩ

OFF

2

ON

4

7

MOTOR

Pin # 18

Short brake

8

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