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BA6219BFP-Y датащи(PDF) 6 Page - Rohm

номер детали BA6219BFP-Y
подробное описание детали  2.0A or More Reversible Motor Drivers (Single Motor)
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BA6219BFP-Y датащи(HTML) 6 Page - Rohm

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Technical Note
6/10
www.rohm.com
2011.05 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
BA6219BFP-Y,BA6222
2) Output high voltage setting
This function optionally sets output voltage by the output high voltage setting pin and controls the motor rotating speed.
However, when the output high voltage is set to a low level, consumption at IC increases. Carry out thermal design with
sufficient margin incorporated with the power dissipation (Pd) under the actual application condition taken into account.
a) BA6219BFP-Y
The circuit diagram associated with the output high voltage setting
VR pin is as per shown on the right. The maximum output voltage
VOMAX is expressed by:
VOMAX = VCC1 - ( VSAT(Q1) + VF(Q2) + VF(Q3) + VF(Q4) )
In addition, the relation of VR voltage to output voltage at VOMAX or lower is
expressed by:
VOH = VR + ( VF(Q5) + VF(Q6) + VF(Q7) ) - ( VF(Q2) + VF(Q3) + VF(Q4) )
VOH = VR + ΔVF ≈ VR
ΔVF depends on the output current but is nearly VOH=VR. (Reference values; VSAT ≈ 0.25V, VF ≈ 0.75V)
b) BA6222
As the relationship between the output high voltage setting pin VR
voltage and output high voltage VOH is expressed by:
VOH ≈ 4 x VR + VOFS
In such event, VOFS means the offset voltage, which varies in accord with
output current and chip temperature.
The VR voltage region can be classified into three categories in accord
with the output state:
(A) Output high voltage 0V offset region
(B) Fourfold gain region
(C) Output voltage saturated region
Using this function with the VR pin connected to a load which has output impedance of several hundred ohms may
result in oscillation. In such event, connect a capacitor of 3300pF or higher to about 0.1μF across VR and GND
and make sure that the motor is free of oscillation.
c)
Power supply voltage range of VR voltage
When output voltage control pin (VR) is used:
VR < VCC1 - ( VSAT(Q1) + VF(Q5) + VF(Q6) + VF(Q7) )
VR ≈ VCC1 - 2.5V
VR < VCC2 - ( VSAT(Q3) - VF(Q3) - VF(Q2) ) - ( VF(Q5) + VF(Q6) + VF(Q7) )
VR ≈ VCC2 - 1V
The output voltage control function does not operate in the region
outside this range. In addition, when the VR pin is not used, use
by shorting VR to VCC1.
3) 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.
OUT
VCC2
VR
VCC1
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Fig. 17
VOH
VR
BA6219BFP-Y
BA6222
VCC1 - 3VF - VSAT
(A)
(B)
(C)
Fig. 18
VOH
VR
Control range
Saturation range
Fig. 19


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