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L9305A
DUAL HIGH CURRENT RELAY DRIVER
.HI .HYSTERESI .I .I .I .SI
GH OUTPUT CURRENT S INPUT COMPARATOR WITH WIDE RANGE COMMON MODE OPERATION AND GROUND COMPATIBLE INPUTS NPUT COMPARATOR HYSTERESIS NTERNAL THERMAL PROTECTION WITH HYSTERESIS NTERNAL OUTPUT OVERVOLTAGE CLAMPING NGLE SUPPLY VOLTAGE (3.5V up to 18V)
Powerdip (8 + 8) ORDERING NUMBER : L9305A
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. BLOCK DIAGRAM
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.
January 1992
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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 V5 V7 IZS VI VI Tj, Tstg Ptot Io Supply Voltage Driver Supply Voltage Supply Zener Clamp Current (DC) (PULSED) (**) Comparator Input Voltage Range Differential Input Voltage Junction and Storage Temperature Power Dissipation at Tamb = 85C Output Current Parameter Value (*) 20 26 30 80 - 0.2 to 24 24 - 55 to 150 928 Int. limited Unit V V mA mA V V C mW
(*) 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 R th j-pins Rth j-amb Parameter Thermal Resistance Junction to pins Thermal Resistance Junction to Ambient Max. Max. Value 15 70 Unit C/W C/W
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L9305A
ELECTRICAL CHARACTERISTICS (V5 = 14.4V, Tamb = 25C ; refer to block diagram unless otherwise specified)
Symbol V5 IS "st.by" ISON VCZ VZS VIH IB IOS CMR ISC ICD VCSAT Parameter Supply Voltage Supply Current Supply Current VI + - VI - 70mV VI - VI
- +
Test Conditions
Min. 3.5
Typ. 5 18
Max. 18* 8 30 27 27 70
Unit V mA mA V V mV A nA V A A mA mA V
> 70mV 20 20 20
Output Clamping Voltage (for IOUT = 1A each channel) Supply Voltage Clamp Comparator Hysteresis Input Bias Current Input Offset Current Input Common Mode Range IZS = 10mA VI - VI = 200mVpp f = 1kHz V V
+ + + -
= V = 0V = V - = 0V 0 Vout = 16.5V Vout = 6V DC Pulsed (**)
+
-
0.2 20
1 200 V5 - 1.6 0.85 2.5 300 600 1
V5 = 3.5V to 18V
-
Output Short Circuit Current for VI - VI 70mV Each Channel Driver Transistor Capability Current VI - VI 70mV VI - VI 70mV ICD = 100mA ICOUT = 1.2A
- + - +
On Status Saturation Voltage
IOL
Output Leakage Current
VI
+
- VI 70mV
-
250
A
* 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
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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). 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.
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L9305A
POWERDIP16 PACKAGE MECHANICAL DATA
DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.30 1.27 8.80 2.54 17.78 7.10 5.10 0.130 0.050 0.38 0.51 0.85 0.50 0.50 20.0 0.346 0.100 0.700 0.280 0.201 0.015 1.40 mm TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.787 0.055 inch TYP. MAX.
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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. (c) 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.
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