BA6664FM 데이터 시트보기 (PDF) - ROHM Semiconductor
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BA6664FM Datasheet PDF : 18 Pages
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BA6859AFP-Y,BA6664FM,BD6671FM
Technical Note
●Operation Explanation
●Torque Command
RNF Forward Offset voltage -
[V]
Offset voltage +
3mV
1.65(ECR)
Fig.11
EC[V]
Rotation direction
EC<ECR
Forward
EC>ECR
Reverse*
*Stops after detecting reverse rotation
The I/O gain GEC from the EC pin to the RNF pin (output current) is determined
by the RNF detection resistor.
①(BA6859AFP-Y)
GEC=0.35/RNF [A/V] ･････(1)
②(BA6664FM)
GECL=0.325/RNF [A/V] (GSW=L)
GECM=0.60/RNF [A/V] (GSW=OPEN)
GECH=1.4/RNF [A/V] (GSW=H)
③(BD6671FM)
GECL=0.175/RNF [A/V] (GSW=L)
GECM=0.35/RNF [A/V] (GSW=M)
GECH=0.70/RNF [A/V] (GSW=H)
④The following torque limit current ITL is obtained (BA6859AFP-Y, BA6664FM)
ITL=0.35/RNF [A]･･･････････････････(2)
⑤(BD6671FM)
ITLL=0.2/RNF [A] (GSW=L)
ITLM=0.4/RNF [A] (GSW=M)
ITLH=0.6/RNF [A] (GSW=H)
The value will become smaller than the computed value due to the wiring
capacity and other factors, if the RNF resistance is 0.5Ω or below.
●Set-up of Motor Rotation Direction and Voltage Range of Torque Control Reference Terminal.
The motor rotation direction determined by the torque control terminal voltage EC and the torque control reference terminal
voltage ECR
Torque control input voltage
EC<ECR
EC>ECR
Io
Forward torque
ITL
Rotation direction
Forward torque
Reverse torque
Reverse torque
0.5
2.5 3.3
5.0
EC[V]
Fig.12
The relation between the input gain and torque limit current expressed as (1) and (2) discussed previously is only valid
when EC and ECR are within a range from 0.5V to 3.3V. Depending on how the torque control reference terminal voltage,
ECR is specified, there may be a case when the output current for the motor does not go up to the torque limit value.
Please be aware of this voltage range when specifying the ECR voltage.
For BA6859AFP-Y, BA6664FM and BD6671FM, 1.6V～2.2V is recommended.
If above conditions are understood, the voltage input range to the EC and ECR terminals can be from 0V to VCC.
●Power Saving
The input circuit specified in I/O circuit 1) BA6859AFP-Y (1) is used for power saving input.
The power saving pin has a temperature characteristic of approximately –5 mV/℃ and also the built-in resistors has a dispersion of 30%.
Keep the input voltage range in mind.
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13/17
2010.06 - Rev.A
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