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Partno	Mfg	Dc	Qty	Available	Descript
TDF1779A	STM	N/a	234	avai	DUAL 2-A SOURCE DRIVER

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TDF1779A
DUAL 2-A SOURCE DRIVER
TDF1779A
April 1993
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 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 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.
PIN CONNECTION
1/9
BLOCK DIAGRAM
MAXIMUM RATINGS
THERMAL CHARACTERISTICS
TDF1779A
2/9
ELECTRICAL OPERATING CHARACTERISTICS
(VCC = + 24V, –40o C < Tj < + 85o C, unless otherwise specified)
TDF1779A
3/9
AVAILABLE OUTPUT CURRENT OUTPUT SATURATION VOLTAGE
AVAILABLE ALARM OR SENSE OUTPUT
CURRENTS
POWER SUPPLY CURRENT
TDF1779A
4/9
TDF1779A
5/9
TYPICAL APPLICATION WITH TDF1779A TWO LOADS 12 V - 2 A
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.
TDF1779A
6/9

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