ROHM BA612

Standard ICs
5-channel high current driver
BA612
The BA612 is a high-current driver IC, and contains an array of five Darlington transistors, each with input resistance.
Input and output can be directed in the same direction using DIP Pin 14, with the layout optimized to facilitate mounting.
Applications
•Hammer
solenoid drivers
Relay drivers
LED drivers
•1)Features
5-circuit Darlington transistor array.
2) Large current (up to 400mA) can be driven.
3) Input and output pins are aligned in the same direction, for easy mounting.
4) High current transfer ratio.
5) Can be coupled with MOS ICs.
•Block diagram
N.C.
1
14
N.C.
IN1
2
13
OUT1
IN2
3
12
OUT2
IN3
4
11
OUT3
IN4
5
10
OUT4
IN5
6
9
OUT5
GND
7
8
N.C.
Sub
1
Standard ICs
BA612
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
VCC
24
V
Power dissipation
Pd
550∗
mW
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
Collector current
IC
450
mA
Input pin voltage withstanding ( + )
VIN +
24
V
Input pin voltage withstanding ( – )
VIN –
– 0.5
V
∗ Reduced by 5.5mW for each increase in Ta of 1°C over 25°C
•Internal circuit configuration
13
12
Q1
R1
3
11
Q3
R1
4
Q5
R1
10
Q7
R1
5
9
Q2
R2
R3
Q4
R2
Q6
R2
R3
Q9
Q8
R2
R3
R1
6
2
Q10
R2
R3
R3
7
R1 = 25kΩ
R2 = 25kΩ
R3 = 2kΩ
Fig.1
•Electrical characteristics (unless otherwise noted, Ta = 25°C)
Parameter
Usage voltage range
Symbol Min. Typ.
Max. Unit
VCC
—
—
20
V
IL
—
—
100
µA
Output current (1 circuit)
IOUT
—
—
400
Output current (5 circuits)
IOUT
Output leakage current
Collector saturation voltage
Fig.3
Conditions
—
—
VCC = 26V, VIN = 0V
Fig.10
mA
When only 1 circuit is on
Fig.11
—
DC per circuit when all 5 circuits are on at once
VCE (sat)
—
—
2.0
V
IOUT = 400mA, VIN = 17V
DC current transfer ratio
hFE
2000
—
—
—
—
Input current
IIN
—
0.6
1.0
mA
2
Measurement
circuit
VIN = 17V, IOUT = 0mA
—
Fig.11
—
Fig.11
Standard ICs
BA612
MAXIMUM OUTPUT CURRENT: IOUT (mA)
POWER DISSIPATION: Pd (mW)
1000
800
600
550
400
200
0
75
– 25
0
40
125
80
120
500
400
All 5 circuits on at once
Repetition: 1Hz min.
300
200
Ta = 25°C
100
Ta = 50°C
0
0
160
20
AMBIENT TEMPERATURE: Ta (°C)
40
60
80
100
OUTPUT SATURATION VOLTAGE: VO (sat) (V)
•Electrical characteristic curves
4.0
3.2
2.4
1.6
0.8
0
0
DUTY CYCLE: (%)
Fig.2 Power dissipation vs. ambient
temperature
VIN = 17V
200
400
OUTPUT CURRENT: IOUT (mA)
Fig.3 Output current vs. duty cycle
Fig.4 Output saturation voltage vs.
output current
OUTPUT VOLTAGE: VOUT (V)
28
+ 75
20
+ 100
+ 50
+ 25
12
0
— 25
— 50°C
4
0
0
2
4
6
8
6
When IO = 20mA
4
INPUT VOLTAGE: VIN (V)
3
VO = 2.0V
IO = 400mA
104
IO = 200mA
103
– 40 – 20
0
20
40
60
80
100
AMBIENT TEMPERATURE: Ta (°C)
Fig.8 DC current amplification ratio vs.
ambient temperature (@)
(when VO = 2V)
OUTPUT SATURATION VOLTAGE: VO (sat) (V)
DC FOWARD CURRENT TRANSFER RAT10: hFE
Fig.5 Output voltage vs. input voltage
(temperature characteristic)
105
3
VO = 1.5V
IO = 400mA
104
IO = 200mA
2
0
10
105
8
GAIN CURRENT: hFE
INPUT THRESHOLD VOLTAGE: Vth (V)
10
36
103
– 40
0
40
80
120
– 40 – 20
0
20
40
60
80
AMBIENT TEMPERATURE: Ta (°C)
AMBIENT TEMPERATURE: Ta (°C)
Fig.6 Input threshold voltage vs.
ambient temperature
Fig.7 DC current amplification ratio vs.
ambient temperature (!)
(when VO = 1.5V)
2.0
1.6
IO = 400mA
1.2
IO = 200mA
0.8
IO
0.4
0
VIN
17V
– 40
VO (sat)
0
40
80
120
AMBIENT TEMPERATURE: Ta (°C)
Fig.9 Output saturation voltage vs.
ambient temperature
3
Standard ICs
BA612
•Measurement circuit
•Application example
VCC 26V
VCC
IL
OUT
IN
BA612
BA612 1 5 circuit
7
PMOS
GATE
Fig.10
Fig.12
OUT
IN
BA612
IIN
VIN
IOUT
17V
7
VOUT (sat)
Fig.11
•External dimensions (Units: mm)
3.2 ± 0.2
1
7
6.5 ± 0.3
8
0.51Min.
4.25 ± 0.3
19.4 ± 0.3
14
7.62
0.3 ± 0.1
2.54
0.5 ± 0.1 0° ~ 15°
DIP14
4
Connections should be made as shown in Figure 12 if
inductive load is being driven.
A clamp diode has to be added in series with the load
to suppress surges in the inductive load.