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TDF1778
DUAL 2-A SOURCE DRIVER
TDF1778April 1993
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
DESCRIPTIONThe 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 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 CONNECTION1/10
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
TDF17782/10
ELECTRICAL CHARACTERISTICS (VCC = + 24V, – 40o C < Tj < + 85o C, unless otherwise specified)
TDF17783/10
TDF17784/10
OPEN LOAD DETECTION
SHORT CIRCUIT CONDITIONS WAVEFORMS WITH AUTOMATIC RESET/RESET = 0
TDF17785/10
DEMAGNETIZATION UNDER INDUCTIVE LOAD
SHORT CIRCUIT WAVEFORMS WITH CONTROLLED RESET/RESET = 1
TDF17786/10
