TDF1778 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 DESCRIPTION The 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 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. MULTIWATT11 ORDERING NUMBER : TDF1778SP PIN CONNECTION 1 2 3 4 5 6 7 8 9 10 11 April 1993 - Output 1 - VCC - Output 2 - N.C. - Strobe - Ground - Input 2 - Sense output - Alarm output - Reset input - Input 1 1/10 TDF1778 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol VCC VI , Vreset Vstrobe Parameter Value Unit 35 V (60 V/10 ms) V Input Voltage (pins 7, 10 and 11) – 30 to + 50 V Strobe Input Voltage – 0.5 to VCC V Supply Voltage IO Output Current Internally Limited A Ptot Power Dissipation Internally Limited W Toper Operating Ambient Temperature Range – 40 to + 85 °C + 150 °C Tj Junction Temperature THERMAL DATA Symbol Value Unit Rth(j–c) Junction-case Thermal Resistance Max. 3 °C/W R th(j–a) Junction-ambient Thermal Resistance Max. 40 °C/W 2/10 Parameter TDF1778 ELECTRICAL CHARACTERISTICS (VCC = + 24V, – 40oC < Tj < + 85oC, unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit VCC Power Supply Voltage 8 – 32 V ICC Power Supply Current (pin 6), I01 = I02 = 2A – – 20 mA VIL VIH Logic Input Voltage (pins 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 High Level Logic Output Voltage (pins 8, 9) I(8) = I(9) = – 30 µA 2.4 4 – – 0.4 – – 1.5 1.8 – 400 1000 Switch–off Output Voltage (inductive load) 40 – 44 – 48 Available Output Current (pins 1, 3), V(7) High, V(11) High, VCC – VO = 32V, Tj = 25°C 100 – – VOH VOL VCC – VO1 VCC – VO2 IOL VCC – VO1 VCC – VO2 IO1, IO2 V Low Level Logic Output Voltage (pins 8, 9) I(8) = I(9) = 2 mA Output Saturation Voltage (V(7) high, V(11) high, IO = 2A) Low Level Input Current (pins 1, 3) V(7) Low, V(11) Low, VO = 0V V V µA V mA IOalarm Available ”Alarm” Output Current, V(9) = + 4V 4 8 – mA IOsense Available ”Sense” Output Current, V(8) = + 4V 4 8 – mA IIHsense Output Sensing High Level Input Current (pins 1, 3) VI = + 2V VIHsense High Level ”Sense” Input Voltage (pins 1, 3) – 1 2 mA 0.8 1.9 2.5 V 3/10 TDF1778 4/10 TDF1778 OPEN LOAD DETECTION Open l oad detection is possi ble during the hachur ed aeras. SHORT CIRCUIT CONDITIONS WAVEFORMS WITH AUTOMATIC RESET/RESET = 0 5/10 TDF1778 SHORT CIRCUIT WAVEFORMS WITH CONTROLLED RESET/RESET = 1 DEMAGNETIZATION UNDER INDUCTIVE LOAD 6/10 TDF1778 TYPICAL APPLICATION TYPICAL APPLICATION WITH TDF1778 TWO INDUCTIVE LOADS 2 A - 24 V Load : LC = 80 mH, R C = 12 Ω R max = VCC/1 mA MAIN FEATURES This application protected against short circuits. The load disconnection is detected when inputs E1 and E2 are low and the sense output is high. When thermal protectionis activatedthe pin 9 islow. Inputs and outputs are TTL comptable. 7/10 TDF1778 TDF1778 HIGH CURRENT APPLICATION WITH INDUCTIVE LOAD 24 V - 4 A Load : LC = 80 mH, TC = 6 Ω Rmax = VCC/2 mA MAIN FEATURES This application has the same features as the dual 2 A -12 V application. 8/10 TDF1778 MULTIWATT11 PACKAGE MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 D 0.063 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 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 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 0.713 0.114 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 9/10 TDF1778 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 MULTIWATT is a Registered Trademark of the SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 10/10