STMICROELECTRONICS TDF1779A

TDF1779A
DUAL 2-A SOURCE DRIVER
..
.
.
.
OUTPUT CURRENT UP TO 2.5 A
WIDE RANGE OF SUPPLY VOLTAGE : + 8 V
TO + 26 V
CAN WITHSTAND OVERVOLTAGES OF AS
HIGH AS 60 V BETWEEN VCC AND GROUND
OUTPUT VOLTAGE CAN SWING TO LOWER
THAN GROUND
”SENSE” AND ”ALARM” OUTPUTS ARE OPEN
COLLECTOR OUTPUTS
DESCRIPTION
The TDF1779A is a dual source driver delivering
hihg outputcurrents and the capabilityto drive highly
inductive loads (Electrovalves, contractors, relays...).
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.
MULTIWATT-11
ORDERING NUMBER : TDE 1779ASP
PIN CONNECTION
12345678910 11 -
Output 1
VCC
Output 2
N.C.
Strobe
Ground
Input 2
Sense output
Alarm output
Reset input
Input 1
Tab is connected to pin 6
April 1993
1/9
TDF1779A
BLOCK DIAGRAM
MAXIMUM RATINGS
Symbol
VCC
VI , Vreset
arameter
Value
Supply Voltage
Input Voltage (Pins 7, 10 and 11)
V
– 30 to + 50
V
– 0.5 to VCC
V
IO
Output Current
Internally Limited
A
Ptot
Power Dissipation
Internally Limited
W
Toper
Operating Ambient temperature Range
– 40 to + 85
°C
Vstrobe
Strobe Input Voltage
Unit
35 V (60 V/10 ms)
THERMAL CHARACTERISTICS
Symbol
2/9
Value
Uni
Rth (j-c)
Junction-case Thermal Resistance
Parameter
Max.
3
°C/W
R th (j-a)
Junction-ambient Thermal Resistance
Max.
40
°C/W
TDF1779A
ELECTRICAL OPERATING CHARACTERISTICS
(VCC = + 24V, –40oC < Tj < + 85oC, unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
VCC
Power Supply Voltage
8
-
26
V
ICC
Power Supply Current (pin 6), IO1 =IO2 = 2A
-
-
20
mA
VIL
VIH
Logic Input Voltage (pin 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) V I = + 0.8V
–5
0
+5
µA
-
Off State Output Voltage (pins 8,9) |(8) = |(9) = 2 mA
-
-
0.4
V
Output Saturation Voltage (V(7) high, V(11) High, IO = 2A)
-
1.5
1.8
V
Low Level Output Current pins 1,3)
V(7) Low, V(11) Low, VO = 0V
-
400
1000
µA
Switch-off Output Voltage (inductive load) Note 1
-
-
45
V
10
-
-
mA
VCC – V01
VCC – V02
IOL
VCC – V01
VCC – V02
IO1, IO2
Available Ouptut Current (pins 1,3), V(7) high, V(11p) high,
VCC – VO = 26V, Tj = 25°C
IO Alarme
Available ”Alarme” Output Current, V(9) = + 4V
4
8
-
mA
IO Sense
Available ”Sense Ouptut Current, V(8) = + 4V
4
8
-
mA
IIH Sense
Output Sensing high Level Input Current (pins 1,3) VI = +2V
-
1
2
mA
Note 1 : An external discharge circuit is required for inductive loads
3/9
TDF1779A
AVAILABLE OUTPUT CURRENT
OUTPUT SATURATION VOLTAGE
AVAILABLE ALARM OR SENSE OUTPUT
CURRENTS
POWER SUPPLY CURRENT
4/9
TDF1779A
5/9
TDF1779A
TYPICAL APPLICATION WITH TDF1779A TWO LOADS 12 V - 2 A
Load : RC = 6 Ω
The external Zener diode must dissipate the power stored in the inductance LC.
R1min = VCC/4 mA, R2min = VCC/4 mA, Rmax = VCC/1 mA.
MAIN FEATURES
This application is protected against for short circuit and overload.
The load disconnection is detected when inputs E1 and E2 are low and the sense output is high.
When thermal protection is actived the pin 9 is low. Inputs are TTL compatible.
Sense output, Alarm output are open collector.
6/9
TDF1779A
TDF1779A HIGHT CURRENT APPLICATION WITH LOAD 12 V - 4 A
Load : RC = 3 Ω
The external Zener diode must dissipate the power stored in the inductance Lc.
R1min = VCC/4 mA, R2min = VCC/4 mA, Rmax = VCC/2 mA.
MAIN FEATURES
This application has the same features as the dual 2 A - 12 V application.
7/9
TDF1779A
MULTIWATT11 PACKAGE MECHANICAL DATA
DIM.
mm
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
5
B
2.65
0.104
C
1.6
0.063
D
0.197
1
E
0.49
0.039
0.55
0.019
0.022
F
0.88
0.95
0.035
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
0.037
0.772
H2
8/9
inch
20.2
L
21.9
22.2
L1
21.7
22.1
L2
17.4
L3
17.25
L4
10.3
L7
2.65
22.5
0.795
0.862
0.874
0.87
22.5
0.854
18.1
0.685
17.5
17.75
0.679
0.689
10.7
10.9
0.406
0.421
2.9
0.104
0.886
0.886
0.713
0.699
0.429
0.114
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
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
TDF1779A
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
MULTIWATT11 is a Registered Trademark of the SGS-THOMSON Microelectronics
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