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Motor driver ICs
Reversible motor driver
BA6283N / BA6284N / BA6955N
The BA6283N, BA6284N, and BA6955N are reversible-motor drivers with a maximum output current of 1.0 A. Two logic
inputs allow four output modes: forward, reverse, stop (standby), and brake.
The built-in power save circuit suppresses current consumption in the motor stop mode.
Applications
VCRs, audio devices
Features
1) Logic and driver sections have separate ground pins;
this allows the IC to drive speed-variable, reversible
motors by connecting an electronic governor circuit.
2) Built-in power saving circuit suppresses current consumption in stop (standby) mode.
Absolute maximum ratings (Ta = 25C)
3) Interfaces with TTL devices.
4) Built-in thermal shutdown circuit.
Recommended operating conditions (Ta = 25C)
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Motor driver ICs BA6283N / BA6284N / BA6955N
Block diagram
BA6283N
BA6284N
BA6955N
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Motor driver ICs BA6283N / BA6284N / BA6955N
Pin descriptions
BA6283N
BA6284N
BA6955N
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Motor driver ICs BA6283N / BA6284N / BA6955N
Input / output circuits
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Motor driver ICs BA6283N / BA6284N / BA6955N
Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 9V, and VM = 9V)
Input / output truth table
Application example
BA6283N
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Motor driver ICs BA6283N / BA6284N / BA6955N
BA6284N
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Motor driver ICs BA6283N / BA6284N / BA6955N
Operation notes
(1) The quality of these products have been carefully
checked; however, use of the products with applied voltages, 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 physical safety measures.
(2) GND potential
The potential for pin 1 must be kept lower than the potentials of the other pins regardless of the circumstances.
(3) Input pins
Voltage should never be applied to the input pins when
the V
CC voltage is not applied to the IC. Similarly, when
CC is applied, the voltage on each input pin should be
V
less than V
CC 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 fluctuate. 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 components, 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. T o 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 environment. 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 ratings 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.
(10) Rush current
There are no circuits built into these ICs that prevent rush
currents. Therefore, it is recommended to place a current
limiting resistor or other physical countermeasure.
(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) Input pins (F
IN and RIN pins have thermal characteristics. Take
The F
IN and RIN) thermal characteristics
these thermal characteristics into consideration when
using the IC.
(13) Thermal shutdown circuit (TSD)
When the junction temperature reaches approximately
170C (Typ.) during operation, the driver outputs are all
turned off.
There is an approximate 20C (T yp.) thermal hysteresis.
(14) Motor noise
To eliminate motor noise, connect a capacitor between
OUT1 and GND and between OUT2 and GND. Alternatively, connect a capacitor between OUT1 and OUT2,
and also a diode between OUT1 and GND and between
OUT2 and GND (see the figure below).
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Motor driver ICs BA6283N / BA6284N / BA6955N
Electrical characteristic curves
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Motor driver ICs BA6283N / BA6284N / BA6955N
External dimensions (Units: mm)
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