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BA6222 Datasheet(PDF) 6 Page - Rohm

Part No. BA6222
Description  Reversible motor drivers (up to 2A series)
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
Logo ROHM - Rohm

BA6222 Datasheet(HTML) 6 Page - Rohm

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Technical Note
6/10
BA6219BFP-Y, BA6222
www.rohm.com
2009.04 - Rev.A
c
2009 ROHM Co., Ltd. All rights reserved.
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 hundreds ohm 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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