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KA3011 Arkusz danych(PDF) 8 Page - Fairchild Semiconductor

Numer części KA3011
Szczegółowy opis  3-Phase BLDC Motor Driver
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA3011 Arkusz danych(HTML) 8 Page - Fairchild Semiconductor

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KA3011BD
8
Application Information
1. TORQUE & 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.
The input range of ECR, EC is 0.2V ~ 4V.
2. SHORT BRAKE
Pin # 18
Short brake
+
−−−−
+
−−−−
Torque AMP
EC
ECR
VM
ECR-EC
Current Sense AMP
TSD
Gain
Controller
Driver
M
RCS
VCS
+
−
IO
VM
Forward
Ecoff+
Ecoff
−
Reverse
VRNF
[V]
3 mV
0
ECR -EC
Rotation
ECR > EC
Forward rotation
ECR < EC
Stop after detecting
reverse rotation
0.51[A/V]
−50mV
50mV
2
4
7
18
VCC
ON
OFF
30k
Ω
50k
Ω
MOTOR
OFF
ON


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