TDF1778
April 1993
DUAL 2-A SOURCE DRIVER
.
OUTPUT CURRENT UP TO 2.5 A
.
WIDE RANGE OF SUPPLY VOLTAGES : + 8 to
+ 32 V
.
CAN WITHSTAND OVERVOLTAGES OF AS
HIGH AS 60 V BETWEEN V
CC
AND GROUND
.
INTERNAL ZENER DIODE PROVIDES FAST
SWITCHING OF INDUCTIVE LOADS
.
OUTPUT VOLTAGE CAN BE LOWER THAN
GROUND
DESCRIPTION
The TDF1778 is a dual source driver delivering high
output currents and capable to drive any type of
loads (Electrovalves, contactors, lamps).
This device is essentially blow-out proof, each out-
put is protected against short-circuits. If internal dis-
sipation becomes too high, drivers will shut down to
prevent excessive heating. An "ALARM" output is
provided to indicate the action of the thermal protec-
tion. To reactivate the power outputs, the reset input
must be forced to low state.
"SENSE" information of both power outputs are
ORed together and then processed internally.
A "STROBE" input is also provided to offer the pos-
sibility of disabling the power outputs.
MULTIWATT11
ORDERING NUMBER : TDF1778SP
PIN CONNECTION
1
- Output 1
2
- VCC
3
- Output 2
4
- N.C.
5
- Strobe
6
- Ground
7
- Input 2
8
- Sense output
9
- Alarm output
10 - Reset input
11 - Input 1
1/10
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
35 V (60 V/10 ms)
V
V
I
, V
reset
Input Voltage (pins 7, 10 and 11)
30 to + 50
V
V
strobe
Strobe Input Voltage
0.5 to V
CC
V
I
O
Output Current
Internally Limited
A
P
tot
Power Dissipation
Internally Limited
W
T
oper
Operating Ambient Temperature Range
40 to + 85
C
T
j
Junction Temperature
+ 150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th(jc)
Junction-case Thermal Resistance
Max.
3
C/W
R
th(ja)
Junction-ambient Thermal Resistance
Max.
40
C/W
TDF1778
2/10
ELECTRICAL CHARACTERISTICS (V
CC
= + 24V, 40
o
C < T
j
< + 85
o
C, unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
CC
Power Supply Voltage
8
32
V
I
CC
Power Supply Current (pin 6), I
01
= I
02
= 2A
20
mA
V
IL
V
IH
Logic Input Voltage (pins 7, 10, 11)
2
0.8
V
V
I
Logic Input Threshold (pin 5)
0.8
V
I
IH
High Level Input Current (pins 7, 10, 11) V
I
= + 2V
20
50
A
I
IL
Low Level Input Current (pins 7, 10, 11) V
I
= + 0.8V
5
0
+ 5
A
V
OH
High Level Logic Output Voltage (pins 8, 9)
I(8) = I(9) = 30
A
2.4
4
V
V
OL
Low Level Logic Output Voltage (pins 8, 9)
I(8) = I(9) = 2 mA
0.4
V
V
CC
V
O1
V
CC
V
O2
Output Saturation Voltage (V(7) high, V(11) high, I
O
= 2A)
1.5
1.8
V
I
OL
Low Level Input Current (pins 1, 3)
V(7) Low, V(11) Low, V
O
= 0V
400
1000
A
V
CC
V
O1
V
CC
V
O2
Switchoff Output Voltage (inductive load)
40
44
48
V
I
O1
, I
O2
Available Output Current (pins 1, 3), V(7) High, V(11) High,
V
CC
V
O
= 32V, T
j
= 25
C
100
mA
I
Oalarm
Available "Alarm" Output Current, V(9) = + 4V
4
8
mA
I
Osense
Available "Sense" Output Current, V(8) = + 4V
4
8
mA
I
IHsense
Output Sensing High Level Input Current (pins 1, 3) V
I
= + 2V
1
2
mA
V
IHsense
High Level "Sense" Input Voltage (pins 1, 3)
0.8
1.9
2.5
V
TDF1778
3/10
PDF 
ZIP
