L9305A DUAL HIGH CURRENT RELAY DRIVER .. .. . . HIGH OUTPUT CURRENT HYSTERESIS INPUT COMPARATOR WITH WIDE RANGE COMMON MODE OPERATION AND GROUND COMPATIBLE INPUTS INPUT COMPARATOR HYSTERESIS INTERNAL THERMAL PROTECTION WITH HYSTERESIS INTERNAL OUTPUT OVERVOLTAGE CLAMPING SINGLE SUPPLY VOLTAGE (3.5V up to 18V) DESCRIPTION The L9305A is a monolithic interface circuit with differentialinput comparator and open collector output able to sink high current specifically to drive relays, lamps, d.c. motors. Particular care has been taken to protect the device against destructive failures - short circuit of outputs to VS, output overvoltages, supply overvoltage. Powerdip (8 + 8) ORDERING NUMBER : L9305A A built in thermal shut-down switches off the device when the IC’s internal dissipationbecomes too great and the chip temperature exceeds a set security threshold. A hysteresis input comparatorincreases the interface’s noise immunity, allowing the correct use also in critical environments as automotive or industrial applications. BLOCK DIAGRAM January 1992 1/6 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. L9305A ABSOLUTE MAXIMUM RATINGS Symbol Parameter V5 Supply Voltage V7 Value Unit (*) 20 V Driver Supply Voltage 26 V IZS Supply Zener Clamp Current (DC) (PULSED) (**) 30 80 mA mA VI Comparator Input Voltage Range – 0.2 to 24 V VI Differential Input Voltage 24 V Tj, Tstg Ptot Io Junction and Storage Temperature Power Dissipation at Tamb = 85°C Output Current – 55 to 150 °C 928 mW Int. limited (*) The maximum allowed supply voltage without series resistors is limited by the built-in zener protection diodes (**) Ton ≤ 2.5 ms ; repetition time ≥ 30 ms. PIN CONNECTION (top view) THERMAL DATA Symbol 2/6 Value Unit R th j-pins Thermal Resistance Junction to pins Parameter Max. 15 °C/W Rth j-amb Thermal Resistance Junction to Ambient Max. 70 °C/W L9305A ELECTRICAL CHARACTERISTICS (V5 = 14.4V, Tamb = 25°C ; refer to block diagram unless otherwise specified) Symbol Parameter Test Conditions V5 Supply Voltage IS ”st.by” Supply Current VI + – VI – ≥ 70mV ISON Supply Current VI – VI VCZ Output Clamping Voltage (for IOUT = 1A each channel) VZS Supply Voltage Clamp IZS = 10mA VIH Comparator Hysteresis VI – VI = 200mVpp f = 1kHz IB Input Bias Current IOS CMR – + Max. Unit 18* V 5 8 mA 18 30 mA 20 27 V 20 27 V 20 70 mV > 70mV + – V + = V = 0V 0.2 1 µA Input Offset Current V + = V – = 0V ± 20 ± 200 nA Input Common Mode Range V5 = 3.5V to 18V – Output Short Circuit Current for VI – VI ≥ 70mV Each Channel ICD Driver Transistor Capability IOL Typ. 3.5 ISC VCSAT Min. 0 V5 – 1.6 V A – + Vout = 16.5V Vout = 6V 0.85 2.5 A – + DC Pulsed (**) 300 mA Current VI – VI ≥ 70mV 600 mA + 1 V – 250 µA On Status Saturation Voltage VI – VI ≥ 70mV ICD = 100mA ICOUT = 1.2A Output Leakage Current VI – + – VI ≥ 70mV * TON ≤ 2.5 ms ; repetition time ≥ 30 ms. ** The maximum allowed supply voltage without limiting resistors is limited by the built-in protection zener diodes see VCZ, VZS Spec. velues. TEST AND APPLICATION CIRCUIT 3/6 L9305A APPLICATION INFORMATIONS (refer to application circuit) D1 and D2 diodes are required only for reverse polarity protection. If VS may be higher than VZS a resistor RS is necessary to limit the zener current IZS. In order to determine RS value the following equations can be used : VS MAX – VD1 – VZS min 1) < IZS MAX RS 2) VS min – VD1 – RS – ISON MAX > VST min where from Tamb = 25 °C : - VS MAX and VS min are the maximum and minimum values of power supply voltage - VD1 is the forward diode D1 voltage drop - VZS min = 20 V - IZS MAX = 30 mA for d.c. mode and IZS MAX = 80 mA for pulsed mode (see Absolute maximum ratings) - ISOM MAX = 30 mA - VST min = 3.5 V If no RS value can satisfy the system 1), 2) a more powerfull external zener DZ = 18 V is required. Then 1) becomes : Figure 2 : Example of Heatsink Using PC Board Copper (I = 65 mm). 4/6 VS MAX – VD1 – 18 RS < IDZ MAX where IDZ MAX is the maximum allowed DZ current. VA voltage cannot be higher than 20 V otherwise output overvoltage protection may be activated. Morever VA must be less than 16 V if short circuit protection is required. DZ2 = 22 to 24 V is a mandatory for output 7 protection if VS may be higher than 26 V. MOUNTING INSTRUCTION The L9305A is assembled in a new plastic package, the Powerdip, in which 8 pins (from 9 to 16) are attached to the frame and remover the heat produced by the chip. Figure 2 and 3 show two ways of heatsinking. In the first case, a PC board copper area is used as a heatsink I = 65 mm. While in the second case, the device is soldered to an external heatsink. In both examples, the thermal resistance junction-ambient is 35 °C/W. Figure 3 : Example of an External Heatsink. L9305A POWERDIP16 PACKAGE MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.85 b b1 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.40 0.033 0.50 0.38 0.020 0.50 D 0.055 0.015 0.020 20.0 0.787 E 8.80 0.346 e 2.54 0.100 e3 17.78 0.700 F 7.10 0.280 I 5.10 0.201 L Z 3.30 0.130 1.27 0.050 5/6 L9305A 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 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. 6/6