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BA6950FS データシート(PDF) 4 Page - Rohm

部品番号 BA6950FS
部品情報  Reversible motor driver
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BA6950FS データシート(HTML) 4 Page - Rohm

  BA6950FS Datasheet HTML 1Page - Rohm BA6950FS Datasheet HTML 2Page - Rohm BA6950FS Datasheet HTML 3Page - Rohm BA6950FS Datasheet HTML 4Page - Rohm BA6950FS Datasheet HTML 5Page - Rohm BA6950FS Datasheet HTML 6Page - Rohm  
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Motor driver ICs
BA6950FS
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 4.8V, VB = 4.8V)
FCircuit operation
(1)
Input section (FIN, RIN)
Control signals are input from these pins. Current flows
from M2 to M1 (forward mode) when FIN is HIGH and RIN
is LOW, and from M1 to M2 (reverse mode) when RIN is
HIGH and FIN is LOW. Putting FIN and RIN both HIGH re-
sults in the brake mode in which the high-side output
transistor is turned off to shut down the motor driving cur-
rent and the low-side output transistor is turned ON to ab-
sorb the counter-electromotive force of the motor, so that
a brake is put on the motor. When FIN and RIN are both
LOW, both M1 and M2 are left open and the motor stops.
Input / output truth table
(2)
Output section (M1, M2)
Two logic inputs control the motor by changing the status
of bridge-configured transistors.
(3)
Output high level voltage
Values of current, voltage, and HIGH level output voltage
can be set as follows by using external resistors (refer to
the application circuit of Fig. 4).
S I16 pin (IRT1)
I16 pin (IRT1) = V2 pin/R1
S S S 1
S I15 pin (IRT2)
I15 pin (IRT2) = I8 pin
R5/R4
S S S 2
S V16 pin (VRT1)
V16 pin = R3
(I16 pin
)I15 pin))R2
I16 pin
S S S 3
S V7, 9 pin (M1, M2 voltage; high-side voltage)
V7, 9 pin = 4
V16 pin (Typ.)
S S S 4
(4)
Current feedback amplifier
The pin-8 current is increased when the motor rotational
speed is reduced by loading, and the current feedback
amplifier increases the pin-15 current according to equa-
tion 2 . Because the pin-16 voltage then increases ac-
cording to equation 3 , the HIGH level output voltage
also increases according to equation 4 . In this way, the
rotational speed is kept constant by increasing the volt-
age applied to the motor.


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