STMICROELECTRONICS TDF1778

TDF1778
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 VCC 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 output is protected against short-circuits. If internal dissipation becomes too high, drivers will shut down to
prevent excessive heating. An ”ALARM” output is
provided to indicate the action of the thermal protection. 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 possibility of disabling the power outputs.
MULTIWATT11
ORDERING NUMBER : TDF1778SP
PIN CONNECTION
1
2
3
4
5
6
7
8
9
10
11
April 1993
- Output 1
- VCC
- Output 2
- N.C.
- Strobe
- Ground
- Input 2
- Sense output
- Alarm output
- Reset input
- Input 1
1/10
TDF1778
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VI , Vreset
Vstrobe
Parameter
Value
Unit
35 V (60 V/10 ms)
V
Input Voltage (pins 7, 10 and 11)
– 30 to + 50
V
Strobe Input Voltage
– 0.5 to VCC
V
Supply Voltage
IO
Output Current
Internally Limited
A
Ptot
Power Dissipation
Internally Limited
W
Toper
Operating Ambient Temperature Range
– 40 to + 85
°C
+ 150
°C
Tj
Junction Temperature
THERMAL DATA
Symbol
Value
Unit
Rth(j–c)
Junction-case Thermal Resistance
Max.
3
°C/W
R th(j–a)
Junction-ambient Thermal Resistance
Max.
40
°C/W
2/10
Parameter
TDF1778
ELECTRICAL CHARACTERISTICS (VCC = + 24V, – 40oC < Tj < + 85oC, unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
VCC
Power Supply Voltage
8
–
32
V
ICC
Power Supply Current (pin 6), I01 = I02 = 2A
–
–
20
mA
VIL
VIH
Logic Input Voltage (pins 7, 10, 11)
–
2
–
–
0.8
–
V
VI
Logic Input Threshold (pin 5)
–
0.8
–
V
IIH
High Level Input Current (pins 7, 10, 11) VI = + 2V
–
20
50
µA
IIL
Low Level Input Current (pins 7, 10, 11) VI = + 0.8V
–5
0
+5
µA
High Level Logic Output Voltage (pins 8, 9)
I(8) = I(9) = – 30 µA
2.4
4
–
–
0.4
–
–
1.5
1.8
–
400
1000
Switch–off Output Voltage (inductive load)
40
–
44
–
48
Available Output Current (pins 1, 3), V(7) High, V(11) High,
VCC – VO = 32V, Tj = 25°C
100
–
–
VOH
VOL
VCC – VO1
VCC – VO2
IOL
VCC – VO1
VCC – VO2
IO1, IO2
V
Low Level Logic Output Voltage (pins 8, 9)
I(8) = I(9) = 2 mA
Output Saturation Voltage (V(7) high, V(11) high, IO = 2A)
Low Level Input Current (pins 1, 3)
V(7) Low, V(11) Low, VO = 0V
V
V
µA
V
mA
IOalarm
Available ”Alarm” Output Current, V(9) = + 4V
4
8
–
mA
IOsense
Available ”Sense” Output Current, V(8) = + 4V
4
8
–
mA
IIHsense
Output Sensing High Level Input Current (pins 1, 3) VI = + 2V
VIHsense
High Level ”Sense” Input Voltage (pins 1, 3)
–
1
2
mA
0.8
1.9
2.5
V
3/10
TDF1778
4/10
TDF1778
OPEN LOAD DETECTION
Open l oad detection is possi ble during the hachur ed aeras.
SHORT CIRCUIT CONDITIONS WAVEFORMS WITH AUTOMATIC RESET/RESET = 0
5/10
TDF1778
SHORT CIRCUIT WAVEFORMS WITH CONTROLLED RESET/RESET = 1
DEMAGNETIZATION UNDER INDUCTIVE LOAD
6/10
TDF1778
TYPICAL APPLICATION
TYPICAL APPLICATION WITH TDF1778 TWO INDUCTIVE LOADS 2 A - 24 V
Load : LC = 80 mH, R C = 12 Ω
R max = VCC/1 mA
MAIN FEATURES
This application protected against short circuits.
The load disconnection is detected when inputs E1
and E2 are low and the sense output is high.
When thermal protectionis activatedthe pin 9 islow.
Inputs and outputs are TTL comptable.
7/10
TDF1778
TDF1778 HIGH CURRENT APPLICATION WITH INDUCTIVE LOAD 24 V - 4 A
Load : LC = 80 mH, TC = 6 Ω
Rmax = VCC/2 mA
MAIN FEATURES
This application has the same features as the dual 2 A -12 V application.
8/10
TDF1778
MULTIWATT11 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
5
0.197
B
2.65
0.104
C
1.6
D
0.063
1
0.039
E
0.49
0.55
0.019
0.022
F
0.88
0.95
0.035
0.037
G
1.45
1.7
1.95
0.057
0.067
0.077
G1
16.75
17
17.25
0.659
0.669
0.679
H1
19.6
0.772
H2
20.2
0.795
L
21.9
22.2
22.5
0.862
0.874
0.886
L1
21.7
22.1
22.5
0.854
0.87
0.886
L2
17.4
18.1
0.685
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
M
4.25
4.55
4.85
0.167
0.179
0.191
M1
4.73
5.08
5.43
0.186
0.200
0.214
0.713
0.114
S
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
9/10
TDF1778
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
MULTIWATT  is a Registered Trademark of the SGS-THOMSON Microelectronics
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A.
10/10