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BA6956AN

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
Technical Note
10/17
BA6956AN,BA6287F,BA6285FS,BA6285AFP-Y,BA6920FP-Y
www.rohm.com
2011.05 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
●Block diagram and pin configuration
BA6920FP-Y
Fig.33 BA6920FP-Y
Table 5 BA6920FP-Y
Pin Name Function
1 NC NC
2 NC NC
3 NC NC
4 NC NC
5 OUT2 Driver output
6 RNF Power ground
7 NC NC
8 GND GND
9 OUT1 Driver output
10 NC NC
11 NC NC
12 NC NC
13 NC NC
14 NC NC
15 NC NC
16 VM Power supply (driver stage)
17 VCC Power supply (small signal)
18 FIN Control input (forward)
19 PS Power save enable pin
20 RIN Control input (reverse)
21 VREF Reference voltage setting pin
22 NC NC
23 NC NC
24 NC NC
25 NC NC
FIN GND GND
C2
C1
R1
M
C3
17
16
9
18
20
CTRL
TSD
FIN
RIN
VM
VCC
OUT1
6
RNF
19
POWER
SAVE
8
FIN
GND
5
OUT2
21
VREF
R2
R3
Fig.34 BA6920FP-Y (HSOP25)
NC
NC
GND
NC
NC
OUT2
RNF
NC
GND
OUT1
NC
NC
NC
NC
NC
NC
GND
NC
NC
VREF
RIN
PS
FIN
VCC
VM
NC
NC
Technical Note
11/17
BA6956AN,BA6287F,BA6285FS,BA6285AFP-Y,BA6920FP-Y
www.rohm.com
2011.05 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
●External application components
1) Resistor for the current limitation, R1
This is a current limiting resistor for collector loss reduction and at the time of short-circuited output. It depends on the
power supply voltage used, etc., but choose resistance of about 5 to 10Ω. In addition, set resistance with utmost care
to voltage drop caused by inrush current that flows when the motor is started.
2) Resistors and zener diode for the output high voltage setting, R2, R3 and ZD
These are the resistors and zener diode used when output high voltage is set. As for the voltage, only ( V
SAT
+ V
F
)
lower than the VREF pin voltage for BA6287F, BA6285FS and BA6285AFP-Y. (Reference values; V
SAT
≈ 0.25V, V
F
≈
0.75V) Zener diode ZD is recommended to be used instead of resistor R3 when the power supply voltage is unstable
for BA6956AN and BA6920FP-Y.
3) Stabilization capacitor for the power supply line, C1
Please connect the capacitor of 1μF to 100μF for the stabilization of the power supply line, and confirm the motor
operation.
4) Phase compensating capacitor, C2, C3
Noise is generated in output pins or oscillation results in accord with the set mounting state such as power supply
circuit, motor characteristics, PCB pattern artwork, etc. As noise oscillation measures, connect 0.01μF to 0.1μF
capacitors.
●Functional descriptions
1) Operation modes
Table 6 Logic table
IN1 IN2 OUT1 OUT2 Operation
L L OPEN* OPEN* Stop (idling)
H L H L Forward (OUT1 > OUT2)
L H L H Reverse (OUT1 < OUT2)
H H L L Brake (stop)
* OPEN is the off state of all output transistors. Please note that this is the state of the connected diodes, which differs from that of the mechanical relay.
** Output OUT1 and OUT2 become OPEN regardless of the input logic of FIN and RIN when switching to the power save mode with the POWERSAVE pin.
a) Stand-by mode
In stand-by mode, all output power transistors are turned off, and the motor output goes to high impedance.
b) Forward mode
This operating mode is defined as the forward rotation of the motor when the OUT1 pin is high and OUT2 pin is
low. When the motor is connected between the OUT1 and OUT2 pins, the current flows from OUT1 to OUT2.
c) Reverse mode
This operating mode is defined as the reverse rotation of the motor when the OUT1 pin is low and OUT2 pin is
high. When the motor is connected between the OUT1 and OUT2 pins, the current flows from OUT2 to OUT1.
d) Brake mode
This operating mode is used to quickly stop the motor (short circuit brake).
Note) 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.
Technical Note
12/17
BA6956AN,BA6287F,BA6285FS,BA6285AFP-Y,BA6920FP-Y
www.rohm.com
2011.05 - Rev.B
© 2011 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) BA6287F, BA6285FS, BA6285AFP-Y
The circuit diagram associated with the output high voltage setting
VREF pin is as per shown on the right. The output high and low
voltages V
OH
and V
OL
are expressed by:
V
OH
= VREF - ( V
SAT(Q1)
+ V
F(Q2)
)
V
OL
= V
SAT(Q3)
(Reference values; V
SAT
≈ 0.15V, V
F
≈ 0.7V)
In addition, the relation of VREF voltage to output voltage is expressed by:
( V
SAT(Q1)
+ V
F(Q2)
) < VREF < VM - V
SAT(Q2)
+ V
F(Q2)
+ V
SAT(Q1)
Therefore, when the VREF voltage condition is as follows, the
output high voltage is restricted.
VREF > VM - V
SAT(Q2)
+ V
SAT(Q1)
+ V
F(Q2)
V
OH
= VM - V
SAT(Q2)
b) BA6956AN, BA6920FP-Y
The circuit diagram associated with the output high
voltage setting VREF pin is as per shown on the right.
The output high and low voltages V
OH
and V
OL
are
expressed by:
V
OH
= VREF + ( V
F(Q5)
+ V
F(Q4)
) - ( V
F(Q2)
+ V
F(Q3)
)
V
OH
≈ VREF
V
OL
= V
SAT(Q6)
(BA6956AN)
V
OL
= V
SAT(Q7)
+ V
F(Q6)
(BA6920FP-Y)
(Reference values; V
SAT
≈ 0.15V, V
F
≈ 0.7V)
The output high voltage controllable range is expressed by:
VREF < VCC - V
SAT(Q1)
- V
F(Q4)
- V
F(Q5)
VREF < VM - ( V
SAT(Q2)
+ V
F(Q3)
) + ( V
F(Q2)
+ V
F(Q3)
) - ( V
F(Q4)
+ V
F(Q5)
) (BA6956AN)
VREF < VM - V
SAT(Q3)
+ ( V
F(Q2)
+ V
F(Q3)
) - ( V
F(Q4)
+ V
F(Q5)
) (BA6920FP-Y)
When the VREF voltage condition is as follows, the output high voltage is restricted.
VREF > VCC - V
SAT(Q1)
- V
F(Q4)
- V
F(Q5)
VREF > VM - ( V
SAT(Q2)
+ V
F(Q3)
) + ( V
F(Q2)
+ V
F(Q3)
) - ( V
F(Q4)
+ V
F(Q5)
) (BA6956AN)
VREF > VM - V
SAT(Q3)
+ ( V
F(Q2)
+ V
F(Q3)
) - ( V
F(Q4)
+ V
F(Q5)
) (BA6920FP-Y)
V
OH
= VCC - V
SAT(Q1)
- V
F(Q2)
- V
F(Q3)
V
OH
= VM - V
SAT(Q2)
- V
F(Q3)
(BA6956AN)
V
OH
= VM - V
SAT(Q3)
(BA6920FP-Y)
VREF
VM
OUT
RNF
(GND, BA6287F)
Q1
Q2
Q3
Fig.35 BA6287F, BD6285FS, BA6285AFP-Y
VM
VCC
OUT
RNF
VREF
Q1
Q2
Q3
Q4
Q5
Q6
Q7
VM
VCC
OUT
RNF
VREF
Q1
Q2
Q3
Q4
Q5
Q6
Fig.36 BA6956AN Fig.37 BA6920FP-Y
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

BA6956AN

Mfr. #:
Buy BA6956AN
Manufacturer:
ROHM Semiconductor
Description:
Motor / Motion / Ignition Controllers & Drivers RECOMMENDED ALT
Lifecycle:
New from this manufacturer.
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