BA6219BFP-Y(2005) 데이터 시트보기 (PDF) - ROHM Semiconductor
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BA6219BFP-Y Datasheet PDF : 9 Pages
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●IC Operation
BA6920FP-Y(BA6219BFP-Y)
1) I/O mode of input block FIN (IN1) and RIN (IN2)
A pin where control signals are input. Each mode operates as explained below.
When the FIN (IN1) is set to high and RIN (IN2) is set to low, the forward rotation mode will be set and a current will flow from OUT1 to
OUT2. When the FIN (IN1) is set to low and RIN (IN2) is set to high, the reverse rotation mode will be set and a current will flow from
OUT2 to OUT1. When both FIN (IN1) and RIN (IN2) are set to high, the brake mode will be set. At that time, the output transistor on the
high side will be turned off to stop the supply of the motor drive current while the output transistor on the low side will be turned on to
absorb the motor back EMF to brake the motor. When both FIN (IN1) and RIN (IN2) are set to low, OUT1 and OUT2 will be both open
potential and the motor will stop.
2) High output voltage setting function
With this function, the output voltage can be set through the high output voltage setting pin in order to control the rotation speed of the
motor. If the high output voltage is set to a lower value, the power consumption of the IC will become high. Consider the power
dissipation (Pd) of the IC under actual operating conditions, and implement thermal designing with a sufficient margin.
2-1. BA6219BF-Y (See Fig.14)
{High output voltage is expressed by the following equation.
VoutH (high output voltage) = VR + {VF(Q5) + VF (Q6) + VF (Q7) - VF (Q2) -VF (Q3) - VF (Q4)} Q1
≒VR +ΔVF
Q2
(VF is the base-emitter voltage in the forward direction)
Although ΔVF depends on the output current, Vo is almost VR.
Q3
Q5
The maximum value VoutHmax of high output voltage that can be set is as follows.
VoutHmax < VCC1 - Vsat (Q1) - VF (Q2) - VF (Q3) - VF (Q4)
Q6
≒VCC1 - 2.5 V
Q7
{Relation of VCC1, VCC2, and VR
VCC1, VCC2, and VR should be set as follows.
VR < VCC2 - Vsat (Q3) + VF (Q3) + VF (Q2) - {VF (Q5) + (Q6) + (Q7)}
VR
Fig.14
≒VCC2 - 1 V
Operating Conditions
High output voltage
VCC1
VCC2
Q4
OUT
Pin
Voltage
Unit
VCC1
8 ～ 18
V
VCC2
8 ～ 18
V
VR
Shown above
-
VR (VREF) voltage
2-2. BA6920FP-Y (See Fig. 16)
{High output voltage is expressed by the following equation:
VoutH (high output voltage) = Vref voltage + {VF (Q2) + VF( Q3)} - {VF(Q4) + VF (Q5)}
≒Vref voltage +ΔVF
(VF is the base-emitter voltage in the forward direction)
Although ΔVF depends on the output current, Vo is almost VR.
The VOH is beyond control if the Vref value is higher than the above, and determined
by the voltage condition of VCC and VM.
For example, when Vref = VCC = VM,
VOH≒VCC - Vsat (Q1) - VF (Q4) -VF (Q5)
≒VCC - 1.7 V
{Relation of VCC, VM, and VREF
VCC1, VCC2, and VR should be set as follows.
VREF < VM - Vsat (Q5) + VF (Q5) + VF (Q4) - {VF (Q2) + (Q3)}
≒ VM - 0.3 V
Operating conditions
pin
Voltage
Unit
VCC
6.5 ～ 34
V
VM
6.5 ～ 34
V
VREF
Shown above
-
Output Voltage Control Range
Fig.15
VCC
VM
Q1
Q4
Q2
Q5
Q3
VREF
OUT
Fig.16
3 ) Selection of forward or reverse rotation
To change the rotation direction of the motor in operation, be sure to brake or open the motor current on time.
In the above case,
Braking: The braking time or over. The braking time is defined as the time of setting the output low level voltage to the GND
potential or below, when the brake operates.
Opening: A period of 1 ms or over is recommended.
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