TDF1779A (R) 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 MULTIWATT-11 DESCRIPTION The TDF1779A is a dual source driver delivering hihg output currents and the capability to drive highly inductive loads (Electrovalves, contractors, relays...). 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. ORDERING NUMBER : TDE 1779ASP PIN CONNECTION 1 2 3 4 5 6 7 8 9 10 11 - Output 1 VCC Output 2 N.C. Strobe Ground Input 2 Sense output Alarm output Reset input Input 1 Tab is connected to pin 6 September 2003 1/9 TDF1779A BLOCK DIAGRAM MAXIMUM RATINGS Symbol VCC VI, Vreset Vstrobe IO Ptot Toper arameter Value Supply Voltage Input Voltage (Pins 7, 10 and 11) Strobe Input Voltage Unit 35 V (60 V/10 ms) V - 30 to + 50 V - 0.5 to VCC V Output Current Internally Limited A Power Dissipation Internally Limited W - 40 to + 85 C Operating Ambient temperature Range THERMAL CHARACTERISTICS Symbol 2/9 Value Uni Rth (j-c) Junction-case Thermal Resistance Parameter Max. 3 C/W Rth (j-a) Junction-ambient Thermal Resistance Max. 40 C/W TDF1779A 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 mA VIL VIH Logic Input Voltage (pin 7,10,11) 2 - 0.8 - V V VI Logic Input Threshold (pin 5) - 0.8 - IIH High Level Input Current (pins 7,10,11) VI = + 2V - 20 50 A IIL Low Level Input Current (pins 7,10,11) VI = + 0.8V -5 0 +5 A - Off State Output Voltage (pins 8,9) |(8) = |(9) = 2 mA - - 0.4 V Output Saturation Voltage (V(7) high, V(11) High, IO = 2A) - 1.5 1.8 V Low Level Output Current pins 1,3) V(7) Low, V(11) Low, VO = 0V - 400 1000 A Switch-off Output Voltage (inductive load) Note 1 - - 45 V 10 - - mA VCC - V01 VCC - V02 IOL VCC - V01 VCC - V02 IO1, IO2 Available Ouptut Current (pins 1,3), V(7) high, V(11p) high, VCC - VO = 26V, Tj = 25C IO Alarme Available "Alarme" Output Current, V(9) = + 4V 4 8 - mA IO Sense Available "Sense Ouptut Current, V(8) = + 4V 4 8 - mA IIH Sense Output Sensing high Level Input Current (pins 1,3) VI = +2V - 1 2 mA Note 1 : An external discharge circuit is required for inductive loads 3/9 TDF1779A AVAILABLE OUTPUT CURRENT OUTPUT SATURATION VOLTAGE AVAILABLE ALARM OR SENSE OUTPUT CURRENTS POWER SUPPLY CURRENT 4/9 TDF1779A 5/9 TDF1779A TYPICAL APPLICATION WITH TDF1779A TWO LOADS 12 V - 2 A Load : RC = 6 The external Zener diode must dissipate the power stored in the inductance LC. R1min = VCC/4 mA, R2min = VCC/4 mA, Rmax = VCC/1 mA. 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. 6/9 TDF1779A TDF1779A HIGHT CURRENT APPLICATION WITH LOAD 12 V - 4 A Load : RC = 3 The external Zener diode must dissipate the power stored in the inductance Lc. R1min = VCC/4 mA, R2min = VCC/4 mA, Rmax = VCC/2 mA. MAIN FEATURES This application has the same features as the dual 2 A - 12 V application. 7/9 TDF1779A mm DIM. MIN. TYP. inch 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 L3 17.25 17.5 17.75 0.679 0.689 0.713 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 0.114 M1 4.73 5.08 5.43 0.186 0.200 0.214 S 1.9 2.6 0.075 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 8/9 OUTLINE AND MECHANICAL DATA 0.102 Multiwatt11 V TDF1779A Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2003 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 9/9