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BA6283N / BA6955N
Motor driver ICs
Reversible motor driver
BA6283N / BA6955N
The BA6283N and BA6955N are reversible-motor drivers with a maximum output current of 1.0A. 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. 3) Interfaces with TTL devices. 4) Built-in thermal shutdown circuit.
!Absolute maximum ratings (Ta = 25C)
Parameter Applied voltage Power dissipation BA6283N BA6955N Symbol VCC Pd Topr Tstg IOUT Limits 18 11501 10802 -20~+75 -55~+150 10003 Unit V mW C C mA
Operating temperature Storage temperature Output current
1 Reduced by 9.2mW for each increase in Ta of 1C over 25C. 2 Reduced by 8.64mW for each increase in Ta of 1C over 25C. 3 Should not exceed Pd or ASO values.
!Recommended operating conditions (Ta = 25C)
Parameter Operating power supply voltage Symbol VCC VM Min. 5.5 5.5 Typ. - - Max. 15 15 Unit V V
BA6283N / BA6955N
Motor driver ICs
!Block diagram
BA6283N
CONTROL LOGIC
TSD
POWER SAVE
1
OUT2
2
RNF
3
OUT1
4
VM
5
GND
6
VCC
7
FIN
8
GND
9
RIN
BA6955N
CONTROL LOGIC
TSD
POWER SAVE
1
VCC
2
FIN
3
GND
4
RIN
5
OUT2
6
RNF
7
OUT1
8
VM
BA6283N / BA6955N
Motor driver ICs
!Pin descriptions BA6283N
Pin No. 1 2 3 4 5 6 7 8 9 Pin name OUT2 RNF OUT1 VM GND VCC FIN GND RIN Motor output Output GND, for connecting resistor for output current detection Motor output Motor power supply GND Power supply Logic input GND Logic input Functions
BA6955N
Pin No. 1 2 3 4 5 6 7 8 Pin name VCC FIN GND RIN OUT2 RNF OUT1 VM Power supply Logic input GND Logic input Motor output Output GND, for connecting resistor for output current detection Motor output Motor power supply Functions
!Input / Output circuit
VCC VM
FIN RIN
12k
11k
4.7k 11k
OUT2 OUT1
10k 20k
RNF
GND
Resistances are typical values
Fig.1
Fig.2
BA6283N / BA6955N
Motor driver ICs
!Electrical characteristics (unless otherwise noted, Ta=25C, VCC=9V, and VM=9V)
Parameter Circuit current1 Circuit current2 Circuit current3 Input high level voltage Input low level voltage Input high level current Output saturation voltage
Not designed for radiation resistance.
Symbol ICC1 ICC2 ICC3 VIH VIL IIH VCE
Min. - - - 2.0 - 50 -
Typ. 30 40 - - - 90 1.0
Max. 43.5 58 15 - 0.8 130 1.5
Unit mA mA A V V A V VIN=2.0V
Conditions Forward or reverse mode Brake mode Standby mode - -
IO=200mA Sum of the high and low side output transistor voltages
!Measuring circuits
Refer to the Input/Output truth table about the output mode.
ICC
Circuit current : ICC
VCC VIF
VIR
VM
Fig.3
Input high level voltage, Input low level voltage : VIF, VIR
IIH
IIH
Refer to the Input/Output truth table about the output mode. Input high level current
VCC VIF
A V
A VM V VIR
: IIH at VIF=2V, IIH at VIR=2V
Fig.4
BA6283N / BA6955N
Motor driver ICs
VCE : Sum of the high and low side output transistor voltage. IO flows from High to Low Level output pins.
VCC
VIF
VIR
V VOR
V VOF
VM
Fig.5
!Circuit operations (1) Input section (FIN, RIN) Control signals are input from these pins. Input circuit can be controlled with TTL or over voltage input. Operation in each mode is show below. Output current flows from OUT1 to OUT2 (forward mode) when FIN is High and RIN is Low, and from OUT2 to OUT1 (reverse mode) when RIN is Low and RIN is High. Putting FIN and RIN both High result in the brake mode. In this mode, the high-side output transistor is turned off to shut down the motor driving current and the low-side output transistor is turned on to absorb the counter-electromotive force of the motor. When FIN and RIN are both Low, both OUT1 and OUT2 are left open and the motor stops. In this mode the power save circuit turn to active, and whole the IC circuit off cause the circuit current to minimize. Input / output truth table
FIN H L H L RIN L H H L OUT1 H L L OPEN OUT2 L H L OPEN Mode Forward Reverse Brake Standby
(2) Output section (OUT1, OUT2) Two logic inputs control the motor by changing the status of the bridge-configured transistors. (3) Power supply section (VCC, VM) VCC is a logic Power supply terminal, and VM is a Motor Power supply terminal. (4) Thermal shut down (TSD) When the IC internal temperature rises by the accident motor locked, the thermal shut down circuit is activated and all the outputs turn off with regardless of input mode. Then, the temperature fulls and the thermal shut down circuit is disactirated, the output returns with regard of the input mode. This circuit is activated when the IC junction temperature rises above 175C (Typ.) and disabled when it is 150C (Typ.). (5) Power save circuit When FIN and RIN are both Low, all the IC circuit turns off and it decrease the IC consumption current.
BA6283N / BA6955N
Motor driver ICs
(6) Ground (GND, RNF) Attached the current detection resistors at the RNF terminal, the current flowing in the motor can be detected. Also attached the electronic governor, the speed-variable reversible motors can be constructed.
!Application example BA6238N
CONTROL LOGIC
TSD
POWER SAVE
M
VCC LOGIC CONTROL IC
Fig.6
BA6283N / BA6955N
Motor driver ICs
BA6955N
CONTROL LOGIC
TSD
POWER SAVE
LOGIC CONTROL IC
M
VCC
Fig.7
!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 GND pin must be kept lower than the potentials of the other pins regardless of the circumstances. (3) Input pins Voltage should never be supplied to the input pins when the VCC voltage is not applied to the IC. Similarly, when VCC is applied, the voltage on each input pin should be less than VCC 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.
BA6283N / BA6955N
Motor driver ICs
(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. 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 mounted 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 ratting 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 countermeasure, to prevent this. (12) Input pins (FIN and RIN) thermal characteristics The FIN and RIN pins have thermal characteristics. Take 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 (Typ.) 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).
OUT1 OUT2 OUT1 OUT2
BA6283N / BA6955N
Motor driver ICs
!Electrical characteristic curves
OUTPUT HIGH VOLTAGE : VOH (V)
POWER DISSIPATION : Pd (mw)
CIRCUIT CURRENT : ICC (mA)
Curcuit current 2 Inputs FIN : H RIN : H
40
VCC VCC-0.5 VCC-1.0 VCC-1.5 VCC-2.0 VCC-2.5 VCC-3.0 0
Inputs FIN : H RIN : L Outputs : OUT1 VCC=9V VM=9V
BA6283N 1000
30
BA6955N 500
20
Curcuit current 1 Inputs FIN : H RIN : L
10
0
0
25
50
75
100
125
150
0
0
4
8
12
16
20
0.2
0.4
0.6
0.8
1.0
AMBIENT TEMPERATURE : Ta (C)
SUPPLY VOLTAGE : VCC (V)
OUTPUT CURRENT : IOH (A)
Fig.8 Package thermal derating characteristics
Fig.9 Circuit current vs. power supply voltage
Fig.10 Output high level voltage vs. output current
OUTPUT HIGH VOLTAGE : VOL (V)
1.0 0.8 0.6 0.4 0.2 0
Inputs FIN : L RIN : H Outputs : OUT1 VCC=9V VM=9V
0
0.2
0.4
0.6
0.8
1.0
OUTPUT CURRENT : IOL (A)
Fig.11 Output low level voltage vs. output current
!External dimensions (Units : mm)
BA6283N
BA6955N
5.80.2
10.50.5
5.80.2
21.80.2
2.80.2
19.30.2
2.80.2
10.50.5
1.2
3.50.5
1.2
3.50.5
1 2.54
8 0.6 0.8 1.3 0.30.1
1 2.54
9 0.6 0.8 1.3 0.30.1
SIP9
SIP8

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