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BA6247FP-Y Datasheet(PDF) 12 Page - Rohm

Part No. BA6247FP-Y
Description  Reversible motor drivers (for two motors series)
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BA6247FP-Y Datasheet(HTML) 12 Page - Rohm

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Technical Note
12/15
BA6246, BA6246N, BA6247FP-Y, BA6239A, BA6238A, BA6238AN
www.rohm.com
2009.04 - Rev.A
c
2009 ROHM Co., Ltd. All rights reserved.
c) BA6238A, BA6238AN
The circuit diagram associated with the output high voltage setting VR pin is as per shown on the right.
The output high and low voltages VOH and VOL are expressed by:
VOH = VR + ( VF(Q5) + VF(Q4) ) - ( VF(Q2) + VF(Q3) )
VOH ≈ VR
VOL = VSAT(Q7) + VF(Q6)
(Reference values; VSAT ≈ 0.1V, VF ≈ 0.7V)
In addition, the relation of VREF voltage to output voltage is expressed by:
VR < VCC1 - VSAT(Q1) - VF(Q4) - VF(Q5)
VR < VCC2 - ( VSAT(Q2) + VF(Q3) ) + (VF(Q2) + VF(Q3)) - ( VF(Q4) + VF(Q5) )
Therefore, when the VREF voltage condition is as follows, the output high voltage is restricted.
VR > VCC1 - VSAT(Q1) - VF(Q4) - VF(Q5)
VR > VCC2 - ( VSAT(Q2) + VF(Q3) ) + (VF(Q2) + VF(Q3)) - ( VF(Q4) + VF(Q5) )
VOH = VCC1 - VSAT(Q1) - VF(Q2) - VF(Q3)
VOH = VCC2 - VSAT(Q2) - VF(Q3)
3) Control input conditions
The input threshold voltage has a positive temperature coefficient and is expressed by:
ΔVIH
= +2.8mV / °C
ΔVIL
= +1.6mV / °C
ΔT
ΔT
The input pin is pulled up at about 15kΩ.
Set input voltage with care not to exceed the maximum input voltage (internal voltage regulator).
BA6246, BA6246N, BA6247FP-Y ··· 6V
BA6239A, BA6238A, BA6238AN ··· 5V
4) Switching of rotating direction (FWD/REV)
When the rotating direction is changed over by the motor rotating condition, switch the direction after the motor is
temporarily brought to the BRAKE condition or OPEN condition. It is recommended to keep the relevant conditions as
follows:
via BRAKE: Longer than braking time*.
(* the time required for the output L terminal to achieve potential below GND when brake is activated.)
via OPEN: The time longer than 1 ms is recommended (BA6246, BA6246N only)
The motor in no drive might be influenced momentarily because the all driver outputs low at the brake.
VCC2
VCC1
VR
Q1
Q2
Q3
Q4
Q5
OUT
GND
Q6
Q7
Fig.37 BA6238A, BA6238AN


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