FAN8420D3 查看數據表（PDF） - Fairchild Semiconductor

零件编号

产品描述 (功能)

生产厂家

FAN8420D3

3-Phase BLDC Motor Driver

Fairchild Semiconductor 

FAN8420D3

Application Information

1. Torque Control & Output Current Control

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.

Current

[mA]

700

500

Reverse

Forward

Ecoff- Ecoff+

ECR > Ec

ECR < Ec

0.71[A/V]

6

-50mV 0

50mV

ECR -EC

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

Rotation

Forward rotation

Stop after detecting re-

verse rotation

8

Rev. 1.0.1

Oct.. 2000.

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