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PDF BA6950FS Data sheet ( Hoja de datos )
| Número de pieza | BA6950FS | |
| Descripción | Reversible motor driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Motor driver ICs
Reversible motor driver
BA6950FS
The BA6950FS is a reversible-motor driver suited for brush motors. Two logic inputs allow four output modes: forward,
reverse, stop (standby), and brake. The rotational speed of motor can be set arbitrarily by changing the voltage applied
to the motor with control pins. The IC can also drive a motor at a constant speed by using a built-in current feedback
amplifier.
FApplications
VCRs, audio equipment
FFeatures
1) Two logic inputs allow four output modes: forward, re-
verse, stop (standby), and brake.
2) Motor speed variable with voltage control signals.
FAbsolute maximum ratings (Ta = 25_C)
3) Built-in current feedback amplifier allows constant
motor speed.
4) Control gain can be set arbitrarily by using external
resistors.
5) Built-in thermal shutdown circuit.
FRecommended operating conditions (Ta = 25_C)
484
1 page  
Motor driver ICs
FApplication example
BA6950FS
Fig.4
FOperation notes
(1) Thermal shutdown circuit
The thermal shutdown (TSD) circuit turns off all driver
outputs when the IC junction temperature rises above
175_C (Typ.). The temperature difference between the
activation and deactivation settings is about 20_C.
STemperature setting of TSD
(2) Control logic and control signal input pins
Voltage should never be applied to the control logic input
pins (pins 5 and 10) or the control signal input pin (pin 2)
when the VCC voltage is not applied to the IC. Similarly,
the voltage on each input pin should not exceed any ap-
plied VCC voltage.
(3) PCB arrangement
When changing the rotational direction of a motor, a large
current of up to a few hundred milliamperes can flow be-
tween the motor power supply (pin 6) and RNF (pin 8).
Depending on the application, this large output current
may flow back to input pins, resulting in output oscillation
or other malfunctions. Make sure that your design does
not allow a common impedance between the large cur-
rent output lines and the input section. Suppress the
power supply impedance to low levels, otherwise output
oscillation may occur.
(4) Package power
The power dissipated by the IC varies widely with the
supply voltage and the output current. Give full consider-
ation to the package power dissipation rating when set-
ting the supply voltage and the output current.
(5) The input pins (pins 5 and 10) have temperature-
dependent characteristics. Take the temperature effect
into consideration when using the IC.
(6) To eliminate motor noise, connect a capacitor be-
tween M1 (pin 7) and GND and between M2 (pin 9) and
GND.
488
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BA6950FS.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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