TDF1779A
Septe mbe r 200 3
DUAL 2-A SOURCE DRIVER
®
.OUTPUT C URREN T UP TO 2.5 A
.WIDE RANGE OF SUPPLY VOLTAGE : + 8 V
T O + 26 V
.CAN WITHSTAND OVERVOLTAGES OF AS
HIGH AS 60 V BETWEEN VCC AN D GR OUND
.OUTPUT VOLTAGE CAN SWING TO LOWER
THAN GR OU ND
."SENSE" AND "ALARM" OUTPUTS ARE OPEN
COLLE CTO R OUTP UTS
DESCRIPTION
The TDF1779A is a dual source driver delivering
hihg output currents and the capability to drive highly
inductive loads (Electrovalves, contractors, re-
lays...).
This device is essentially blow-out proof, each out-
put is prote cted agai nst short-circuits. If inte rnal di s-
sipatio n 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
mu st be forc ed to low s tat e.
"SENSE" information of both power outputs are
O Red to gether an d t hen p roc e ss ed int ernally .
A " STR OBE " inpu t is als o pro vided to offer the po s-
si bility of disa bli ng t he po wer out p ut s.
MULTIWATT-11
ORDERING NUMBER : TDE 1779ASP
Tab is connected to pin 6
1 - Output 1
2-V
CC
3 - Output 2
4 - N.C.
5-Strobe
6 - Ground
7 - Input 2
8 - Sense ou tp ut
9 - Alarm output
10 - Reset input
11 - Input 1
PIN CONNECTION
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BLOCK DIAGRAM
MAXI MU M R AT IN GS
Symbol arameter Value Unit
VCC Supply Voltage 35 V (60 V/10 m s) V
VI, Vreset Input Voltage (Pins 7, 10 and 11) – 30 to + 50 V
Vstrobe Strobe Input Voltage – 0.5 to VCC V
IOOutput Current Internally Limited A
Ptot Power Dissipation Internally Limited W
Toper Operating Ambient temperature Range – 40 to + 85 °C
THERMAL CHARACTERISTICS
Symbol Parameter Value Uni
Rth (j -c) Junction-case Thermal Resistance Max. 3 °C/W
Rth (j-a) Junction-ambient Thermal Resistanc e Max. 40 °C/W
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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 m A
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) VI = + 0.8V – 5 0 + 5 µA
- Off State Output Voltage (pins 8,9) |(8) = |(9) = 2 mA - - 0.4 V
VCC – V01
VCC – V02 Output Saturation Voltage (V(7) high, V(11) High, IO = 2A) - 1.5 1.8 V
IOL Low Level Output Current pins 1,3)
V(7) Low, V(11) Low, VO = 0V - 400 1000 µA
VCC – V01
VCC – V02 Switch-off Output Voltage (inductive load) Note 1 - - 45 V
IO1, IO2 Available Ouptut Current (pins 1,3), V(7) high, V(11p) high,
VCC – V O = 26V, Tj = 25°C10 - - mA
IO A larme Available "Alarme" Output Current, V(9) = + 4V 4 8 - mA
IO Sense Available "Sense Ouptut Current, V(8) = + 4V 4 8 - mA
IIH Sens e Output Sensing high Level Input Current (pins 1,3) VI = +2V - 1 2 mA
Note 1 : An extern al di scha rge circui t is requi red f or i nduct i ve loads
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AVAILABLE OUTPUT CURRENT OUTPUT SATURATION VOLTAGE
AVAILABLE ALARM OR SENSE OUTPUT
CURRENTS POWER SUPPLY CURRENT
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TDF1779A
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TYPICAL APPLICATION WITH TDF1779A TWO LOADS 12 V - 2 A
Load : RC = 6 Ω
The ext ernal Zene r diod e must di ssi pate t he p ower s tored i n t he in duct ance L C.
R1min = V CC/4 mA, R2min = VCC/4 mA, Rmax = VCC/1 mA.
MAIN FEATURES
T his app lic at io n is pr ot ec ted agains t f or sho rt c ir cu it and ove rl oad.
T he lo ad disconnec tion is det ec ted w hen inputs E1 and E2 are low and the s ens e output is hig h.
W hen th er ma l pr otec t ion is a ctiv ed the pin 9 is low. I npu t s are T TL co mp atible.
Se ns e out p ut , Ala rm ou tp ut ar e open co lle ctor .
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TDF1779A HIGHT CURRENT APPLICATION WITH LOAD 12 V - 4 A
Load : RC = 3 Ω
The ext ernal Zene r diod e must di ssi pate t he p ower s tored i n t he in duct ance Lc .
R1min = V CC/4 mA, R2min = VCC/4 mA, Rmax = VCC/2 mA.
MAIN FEATURES
T his app lic at io n has t he s am e feature s as the dual 2 A - 12 V appl ic at io n.
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Multiwatt11 V
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 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 0.713
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 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
OUTLINE AND
MECHANICAL DATA
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