ROHM BA6951FS Technical data

Reversible Motor Drivers for Brush Motors

0.5A or Less Reversible
Motor Driver (Single Motor)

BA6950FS

0.8A Reversible
Motor Driver (Single Motor)

BA6951FS

●Description

These drivers are reversible motor drivers that can directly drive brush motor which require forward and reverse rotations.
Four modes of output setting are available by the use of input logic (2 inputs); forward, reverse, stop (idling), and braking. In
addition, since voltage applied to motors varies in accord with the control terminal, motor rotating speed can be optionally
set and by the built-in current feedback amplifier, the motor can be driven at a constant speed.

●Features

1) Four-mode outputs of forward, reverse, stop (idling), and braking are enabled in compliance with two inputs

2) Motors can be driven at a constant speed by a current feedback amplifier

3) Built-in thermal shutdown circuit

4) Built-in current limiting function (BA6951FS)

●Applications

Audio-visual equipment; PC peripherals; Car audios; Car navigation systems; OA equipments

●Absolute maximum ratings (Ta=25℃, All voltages are with respect to ground)

Parameter Symbol

Supply voltage VCC 8 V

Supply voltage VB 18 V

Output current I

Operating temperature T

Storage temperature T

Power dissipation Pd 0.813*2 W

OMAX

OPR

STG

BA6950FS BA6951FS

0.4*1 0.8*1 A

-20 ~ 75 ℃

-55 ~ 150

Ratings

Unit

℃

No.11008ECT01

Junction temperature T

*1 Do not, exceed Pd or ASO.
*2 SSOP-A16 package. Mounted on a 70mm x 70mm x 1.6mm FR4 glass-epoxy board with less than 3% copper foil.
Derated at 6.4mW/℃ above 25℃.

●Operating conditions (Ta=25℃)

Parameter Symbol Ratings Unit

Supply voltage VCC 3 ~ 6 V

Supply voltage VB 3 ~ 16 V

VTCL voltage V

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150

jmax

0 ~ (VCC-1.8) V

CTL

1/10

℃

2011.05 - Rev.C

BA6950FS, BA6951FS

●Electrical characteristics (BA6950FS, unless otherwise specified, Ta=25℃ and VCC=4.8V, VB=4.8V)

Parameter Symbol

Supply current 1 I

Supply current 2 I

Supply current 3 I

Input threshold voltage H V

Input threshold voltage L V

Input bias current I

CTL amplifier offset voltage V

CTLOFS

CTL amplifier gain V

CTL output mirror ratio 1 I

CTL output mirror ratio 2 I

CTLR1

CTLR2

CS amplifier offset voltage CS

CS output mirror ratio 1 I

CS output mirror ratio 2 I

Min. Typ. Max.

- 4.0 6.0 mA FWD/REV mode, VCTL=0V

CC1

- 0.7 1.5 mA Standby mode, VCTL=0V

CC2

- 0 1 µA VCC=0V

BOFF

2.0 - VCC V

R/F H

0 - 0.8 V

R/F L

- 80 135 µA FIN=2V, RIN=2V

R/F H

-5 0 5 mV VCTL-RC, VCTL=0V, 1V

40 46 52 µA/V ΔI

CTLGA

0.85 1.00 1.15 ratio I

0.90 1.00 1.10 ratio I

-5 0 5 mV CS1-CS2, CS1=0V, 0.1V

OFS

0.85 1.00 1.15 ratio I

CSR1

0.90 1.00 1.10 ratio I

CSR2

Limits

Unit Conditions

, VCTL=2V, 1V

RT1

, IRC=20µA

RT1/IRC

, IRC=200µA

RT1/IRC

, ICS=20µA

RT2/ICS2

, ICS=200µA

RT2/ICS2

Output high voltage VH 2.0 4.6 - V M1, M2, VCTL=0.2V

Technical Note

Output saturation voltage H VOH - 0.09 0.3 V IO=50mA, RT1=VCC

Output saturation voltage L VOL - 0.07 0.2 V IO=50mA, RT1=VCC

●Electrical characteristics (BA6951FS, unless otherwise specified, Ta=25℃ and VCC=4.8V, VB=4.8V)

Parameter Symbol

Supply current 1 I

Supply current 2 I

Supply current 3 I

Input threshold voltage H V

Input threshold voltage L V

Input bias current I

CTL amplifier offset voltage V

CTLOFS

CTL amplifier gain V

CTL output mirror ratio 1 I

CTL output mirror ratio 2 I

CTLR1

CTLR2

CS amplifier offset voltage CS

CS output mirror ratio 1 I

CS output mirror ratio 2 I

TL-R

offset voltage TL-R

AOFS

Min. Typ. Max.

- 4.0 6.0 mA FWD/REV mode, VCTL=0V

CC1

- 0.7 1.5 mA Standby mode, VCTL=0V

CC2

- 0 1 µA VCC=0V

BOFF

2.0 - VCC V

R/F H

0 - 0.8 V

R/F L

- 80 135 µA FIN=2V, RIN=2V

R/F H

-5 0 5 mV VCTL-RC, VCTL=0V, 1V

40 46 52 µA/V ΔI

CTLGA

0.85 1.00 1.15 ratio I

0.90 1.00 1.10 ratio I

-5 0 5 mV ATC-CS, ATC=0V, 0.1V

OFS

0.85 1.00 1.15 ratio I

CSR1

0.90 1.00 1.10 ratio I

CSR2

6 18 30 mV TL=0.3V, R

AOFS

Limits

Unit Conditions

, VCTL=2V, 1V

RT1

, IRC=20µA

RT1/IRC

, IRC=200µA

RT1/IRC

, ICS=20µA

RT2/ICS

, ICS=200µA

RT2/ICS

ATC

Output high voltage VH 1.85 2.20 2.55 V M1, M2, VCTL=1.0V

=1.0Ω

Output saturation voltage H VOH - 0.28 0.56 V IO=300mA, RT1=VCC

Output saturation voltage L VOL - 0.32 0.64 V IO=300mA, RT1=VCC

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2011.05 - Rev.C

BA6950FS, BA6951FS

Technical Note

●Electrical characteristic curves (Reference data)

5

4

3

2

Supply Current: Icc1 [mA] _

1

34 56

Supply Voltag e: Vcc [V]

Fig.1 Supply current 1 (Forward) Fig.2 Supply current 2 (Standby) Fig.3 Supply current 3
(BA6950FS) (BA6950FS)

5

-20° C
25°C
75°C

0.9

0.8

0.7

-20°C

0.6

Circuit Current: Icc2 [mA] _

0.5

0.4
34 56

Supply Vol tage: Vc c [V]

0.9

25°C
75°C

0.4

0.3

0.2

0.1

Circuit Current: Icc3 [µA] _

0.0
34 56

Supply Vol tage: VB [ V]

400

-20°C
25°C
75°C

4

3

2

Supply Current: Icc1 [mA] _

1

34 56

Supply Voltag e: Vcc [V]

Fig.4 Supply current 1 (Forward) Fig.5 Supply current 2 (Standby) Fig.6 Input bias current
(BA6951FS) (BA6951FS)

5.0

-20° C
25°C
75°C

4.8

4.6

4.4

-20° C
25°C
75°C

4.2

Output High Voltage: VOH [V] _

4.0
0 0.1 0.2 0.3 0.4

Output Current: Iout [A]

Fig.7 Output saturation voltage H Fig.8 Output saturation voltage L Fig.9 Input threshold voltage
(BA6950FS) (BA6950FS)

0.8

0.7

-20°C

0.6

Circuit Current: Icc2 [mA] _

0.5

0.4
34 56

Supply Vol tage: Vc c [V]

1.0

0.8

0.6

0.4

0.2

Output Low Voltage: VOL [V] _

0.0
0 0.1 0.2 0.3 0.4

Output Current: Iout [A]

25°C
75°C

75°C
25°C

-25° C

300

200

100

Input Bias Current: IR/F H [µA] _

0

012345

Input Vol tage: VR/F [V]

5.0

4.0

3.0

2.0

1.0

Output High Voltage: VOH [V] _

0.0
01234

Input Vol tage: VR/F [V]

-25° C
25°C
75°C

75°C
25°C

-25°C

5.0

4.8

4.6

4.4

-20° C
25°C
75°C

1.0

75°C

0.8

0.6

0.4

25°C

-25° C

4.2

Output High Voltage: VOH [V] _

0.2

Output Low Voltage: VOL [V] _

1.5

ii) Mounted on ROHM standard PCB

(70mm x 70mm x 1.6mm FR4 g lass-epox y board)

i) Package only

1.0

ii) 0.813W

Pd [W]

0.5

i) 0.625W

4.0
0 0.2 0.4 0.6 0.8

Output Current: Iout [A]

Fig.10 Output saturation voltage H Fig.11 Output saturation voltage L Fig.12 Thermal derating curve
(BA6951FS) (BA6951FS) (SSOP-A16)

0.0
0 0.2 0.4 0.6 0.8

Output Current: Iout [A]

0.0
0 25 50 75 100 125 150

AMBIEN T TEMPER ATURE [°C ]

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2011.05 - Rev.C

BA6950FS, BA6951FS

●Block diagram and pin configuration

BA6950FS

VCC

12

C5 C6

FIN

10

RIN

5

GND

VCTL

1

2

Table 1 BA6950FS

Pin Name Function

1 GND GND

2 VCTL Control input

3 RC Control gain setting

4 PCT CTL amp phase compensation

5 RIN Control input (reverse)

6 VB Power supply (driver stage)

7 M1 Driver output

8 ATC Current sense pin

9 M2 Driver output

10 FIN Control input (forward)

11 PC Phase compensation

12 VCC Power supply (small signal)

13 CS1 CS amp gain setting

14 CS2 CS amp gain setting

15 RT2 CTL amp gain setting

16 RT1 CTL amp gain setting

CTRL

3

R1 C1

CTRL

AMP

4

VCC

CS

AMP

14

RT2 RT1 CS2 PCT RC

R4

Fig.13 BA6950FS

TSD

PRE

DRIVER

x4

8 15 16

CS1

13

ATC

R5

R2

R3

PC

11

C2

GND

VCTL

RC

PCT

RIN

VB

M1

ATC

Fig.14 BA6950FS (SSOP-A16)

6

7

9

RT1
RT2
CS2

CS1
VCC
PC

FIN
M2

Technical Note

VB

M1

C3

M

M2

C4

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2011.05 - Rev.C