453

Motor driver ICs

Reversible motor driver

BA6289F / BA6417F

The BA6289F and BA6417F are reversible-motor drivers, with an output current of 600mA for the former and 1A for the
latter. Two logic inputs allow four output modes: forward, reverse, stop (idling), and brake. A built-in power saving circuit
suppresses current consumption when the motor is in stop mode.

Applications

Compact, low-current DC motors and portable equipment such as camcorders

Features

1) Two logic inputs allow four output modes: forward, re-

verse, stop (idling), and brake.

2) Built-in power saving circuit suppresses the stop

mode current dissipation.

3) Output voltage can be set arbitrarily with the V

ref

pin.

4) Interfaces with TTL devices.
5) Built-in thermal shutdown circuit turns off all circuits

when high IC junction temperature is detected.

Absolute maximum ratings (Ta = 25

Recommended operating conditions

457

Motor driver ICs

BA6289F / BA6417F

Input / output circuits

Operation notes

(1)

The quality of these products have been carefully

checked; however, use of the products with applied volt-
ages, operating temperatures, or other parameters that
exceed the absolute maximum rating given may result in
the damage of the IC and the product it is used in. If the
IC is damaged, the short mode and open modes cannot
be specified, so if the IC is to be used in applications
where parameters may exceed the absolute maximum
ratings, then be sure to incorporate fuses, or other physi-
cal safety measures.
(2)

GND potential

The potential for pin 8 must be kept lower than the poten-
sials ofthe other pins regardless of the circumstances.
(3)

Input pins

Voltage should never be applied to the input pins when
the V

voltage is not applied to the IC. Similarly, when

is applied, the voltage on each input pin should be

less than V

and within the guaranteed range for the

electrical characteristics.
(4)

Back-rush voltage

Depending on the ambient conditions, environment, or
motor characteristics, the back-rush voltage may fluctu-
ate. Be sure to confirm that the back-rush voltage will not
adversely affect the operation of the IC.

(5)

Large current line

Large currents are carried by the motor power supply and
motor ground for these ICs.
Therefore, the layout of the pattern of the PC board and
the constants of certain parameters for external compo-
nents, such as the capacitor between the power supply
and ground, may cause this large output current to flow
back to the input pins, resulting in output oscillation or
other malfunctions. To prevent this, make sure that the
PC board layout and external circuit constants cause no
problems with the characteristics of these ICs.
(6)

Power dissipation

The power dissipation will fluctuate depending on the
mounting conditions of the IC and the ambient environ-
ment. Make sure to carefully check the thermal design of
the application where these ICs will be used.
(7)

Power consumption

The power consumption by the IC varies widely with the
power supply voltage and the output current. Give full
consideration to the power dissipation rating and the
thermal resistance data and transient thermal resistance
data, to provide a thermal design so that none of the rat-
ings for the IC are exceeded.
(8)

ASO

Make sure that the output current and supply voltage do
not exceed the ASO values.
(9)

Precautions for input mode switching

To ensure reliability, it is recommended that the mode
switching for the motor pass once through the open
mode.

458

Motor driver ICs

BA6289F / BA6417F

(10) In-rush current
There are no circuits built into these ICs that prevent in-
rush currents. Therefore, it is recommended to place a
current limiting resistor or other physical countermea-
sure.
(11) Factors regarding the thermal, power supply, and
motor conditions
If the potential of the output pin sways greatly and goes
below the potential of ground, the operation of the IC may
malfunction or be adversely affected. In such a case,
place a diode between the output and ground, or other
measure, to prevent this.
(12) HIGH level output voltage setting pin
The output voltage can be varied by controlling the V

ref

voltage :
V

ref

(PNP)�V

(NPN)+(V

OUT

�V

ref

offset)

The voltage applied to the V

ref

pin should not exceed the

motor supply voltage (pin 2) or the V

voltage. The V

ref

input range over which the HIGH level output voltage can
be controlled according to the above equation is between
0V and (V

�V

SAT

�V

The output may oscillate if the V

ref

voltage is controlled by

a low-impedance circuit. Set the voltage by either provid-
ing an impedance of about 10k

or connecting a capaci-

tor between the V

ref

and GND pins. Because the optimum

impedance and capacitance values depend on such fac-
tors as the type of motor, the PCB pattern, and the load
current, the values must be determined separately for
each application.
(13) Thermal shutdown circuit
When the thermal shutdown circuit is activated at the IC
junction temperature of about 175

C (typical), all driver

outputs are turned OFF. There is a temperature differ-
ence of about 15

C (typical) between the temperatures

at which the circuit is activated and deactivated.

(13) The input pins (pins 4 and 5 have temperature de-
pendent characteristics. Take the temperature effect into
consideration when using the IC.
(14) To eliminate motor noise, connect a capacitor be-
tween OUT1 (pin 1) and GND and between OUT2 (pin 7)
and GND. Alternatively, connect a capacitor between
OUT1 and OUT2, and also a diode between OUT1 and
GND and between OUT2 and GND.

Электронный компонент: BA6289