SGS Thomson Microelectronics TDF1779A Datasheet
.OUTPUT CURRENT UP TO2.5A
.WIDE RANGE OF SUPPLY VOLTAGE : + 8 V
TO + 26 V
.CAN WITHSTAND OVERVOLTAGES OF AS
HIGHAS 60 VBETWEEN V
ANDGROUND
CC
.OUTPUT VOLTAGECAN SWING TO LOWER
THAN GROUND
.”SENSE” AND”ALARM”OUTPUTSAREOPEN
COLLECTOROUTPUTS
DESCRIPTION
The TDF1779A is a dual source driver delivering
hihgoutputcurrentsandthecapabilitytodrivehighly
inductive loads (Electrovalves, contractors, relays...).
This deviceis essentiallyblow-outproof,each output isprotectedagainstshort-circuits.Ifinternaldissipationbecomestoohigh,driverswillshutdownto
prevent excessive heating. An ”ALARM” output is
providedto indicatetheactionofthethermalprotection.Toreactivatethepoweroutputs,theresetinput
mustbe forcedtolow state.
”SENSE” information of both power outputs are
ORedtogetherand thenprocessedinternally.
A ”STROBE”input isalsoprovidedtoofferthepossibilityof disablingthe power outputs.
TDF1779A
DUAL 2-A SOURCE DRIVER
MULTIWATT-11
ORDERINGNUMBER : TDE 1779ASP
PIN CONNE CTION
April1993
Tab isconnected to pin 6
1 - Output 1
2-V
CC
3 - Output 2
4 - N.C.
5 - Strobe
6 - Ground
7 - Input2
8 - Senseoutput
9 - Alarm output
10 - Resetinput
11 - Input1
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TDF1779A
BLOCK DIAGRAM
MAXIMUM RATINGS
Symbol arameter Value Unit
V
CC
V
I,Vreset
V
strobe
I
O
P
T
oper
tot
Supply Voltage 35 V (60 V/10 ms) V
Input Voltage (Pins 7, 10 and 11) – 30 to + 50 V
Strobe Input Voltage – 0.5 to V
CC
Output Current Internally Limited A
Power Dissipation Internally Limited W
Operating Ambient temperature Range – 40 to + 85 °C
THERMAL CHARACTERISTICS
Symbol Parameter Value Uni
R
R
th (j-c)
th (j-a)
Junction-case Thermal Resistance Max. 3 °C/W
Junction-ambient Thermal Resistance Max. 40 °C/W
V
2/9
TDF1779A
ELECTRICAL OPERATING CHARACTERISTICS
= + 24V, –40oC<Tj<+85oC, unless otherwise specified)
(V
CC
Symbol Parameter Min. Typ. Max. Unit
V
CC
I
CC
V
IL
V
IH
V
I
I
IH
I
IL
- Off State Output Voltage (pins 8,9) |(8) = |(9) = 2 mA - - 0.4 V
V
CC–V01
VCC–V
I
OL
V
CC–V01
VCC–V
I
1, I
O
I
O Alarme
I
O Sense
I
IH Sense
Note1 : Anexternal discharge circuit isrequiredfor inductive loads
Power Supply Voltage 8 - 26 V
Power Supply Current (pin 6), IO1=IO2=2A - - 20 mA
Logic Input Voltage (pin 7,10,11) -
2
-
Logic Input Threshold (pin 5) - 0.8 - V
High Level Input Current (pins 7,10,11) VI= + 2V - 20 50 µA
Low Level Input Current (pins 7,10,11) VI= + 0.8V – 5 0 + 5 µA
Output Saturation Voltage (V(7) high, V(11) High, IO= 2A) - 1.5 1.8 V
02
Low Level Output Current pins 1,3)
V(7) Low, V(11) Low, V
O
=0V
- 400 1000 µA
Switch-off Output Voltage (inductive load) Note 1 - - 45 V
02
Available Ouptut Current (pins 1,3), V(7) high, V(11p) high,
O2
V
CC–VO
= 26V, Tj=25°C
10 - - mA
Available ”Alarme” Output Current, V(9) = + 4V 4 8 - mA
Available ”Sense Ouptut Current, V(8) = + 4V 4 8 - mA
Output Sensing high Level Input Current (pins 1,3) VI= +2V - 1 2 mA
0.8
-
V
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