Features * * * * * * * * * 10 kV - ESD Protection Two Comparators with Common Reference Tight Threshold Tolerance Constant Threshold NPN Output Interference and Damage-protection According to VDE 0839 and ISO/CD 7637 EMI Protection Reversal Polarity Protection Load-dump Protection Description The bipolar U4793B is designed to monitor overload or a short circuit in automotive or industrial applications. The threshold is tied to V4,6 = VS - VT where VT = 44.5 mV. It is independent of the supply voltage, VS. If the voltage drop across shunt resistor, Rsh, exceeds this value, the output is turned on, otherwise the output is turned off. Current Monitor IC U4793B Without supply voltage or open input Pin 8, the output is turned off. The output breakdown voltage is determined by the Z-diodes Z3 and Z5 with a typical value of VZ = 22 V. An unused comparator input must be connected to Pin 7. Block Diagram Figure 1. Schematic and Application Circuit VS V Batt 2 R sh 7 Z 2 + - 4 5 OUT1 3 OUT2 & Z5 0.6 VS R sh + 8 + - & 6 Z3 1 Load R1 150 W Rev. 4557A-AUTO-11/02 1 Pin Configuration Figure 2. Pinning DIP8/SO8 GND VS OUT2 IN1 1 2 3 4 8 7 6 5 Input switch VRef IN2 OUT1 Pin Description Pin Symbol 1 GND 2 VS 3 OUT2 4 IN1 5 OUT1 6 IN2 Function Reference point, ground Supply voltage Output 2 Input 1 Output 1 Input 2 7 VRef 8 Input switch Reference voltage Input switch Absolute Maximum Ratings Parameters Symbol Value Unit VS 16.5 V Current consumption t = 2 ms, measured at Pin 1 (GND) Pin 1 I1 1.5 A Output current I3,5 20 mA -V4,6 6 V Tamb = 125C,DIP8 SO8 Ptot 220 150 mW mW Tamb = 95C, DIP8 SO8 Ptot 420 360 mW mW Tamb = 60C, DIP8 SO8 Ptot 690 560 mW mW Ambient temperature range Tamb -40 to +125 C Storage temperature range Tstg -55 to +125 C Tj 150 C Symbol Value Unit RthJA RthJA 110 160 K/W K/W Supply voltage Pin 2, 7 Pin 3, 5 Input voltage reference point Pin 7 Pin 4, 6 Power dissipation Junction temperature Thermal Resistance Parameters Junction ambient 2 DIP8 SO8 U4793B 4557A-AUTO-11/02 U4793B Electrical Characteristics VS = 9 V to 15 V, Tamb = -40C to +125C, unless otherwise specified (see Figure 1) No. 1 Parameters Supply voltage 1.2 Internal Z-diode Z2 1.3 Current consumption 1.5 2 2.1 2.2 3 Output saturation voltage 3.5 3.6 3.7 3.8 3.9 3.10 4 Typ. Max. Unit Type* 2, 7 VS 9 15 V A 2 VZ 20 V A I1 3.5 4.8 I1 2.8 I1 2.0 1 6.0 mA C VS = 12 V measured Tamb = 25C 1 3.4 6.0 mA A VS = 12 V measured Tamb = 125C 1 2.6 3.2 mA C VS = 9 V, I3,5 = 10 mA Tamb = 25C 3, 5 0.5 V A 3, 5 V A Vsat VZ 21 -VT 42 44 46 mV C -VT 43 44.5 46 mV A -VT 44.5 46 47.5 mV C V/K C Control Signal Control signal threshold I3,5 = 1 mA, figure 3 Tamb = -40C 4, 6 I3,5 = 1 mA, figure 3 Tamb = 25C 4, 6 I3,5 = 1 mA, figure 3 Tamb = 125C 4, 6 Temperature coefficient of control signal threshold Input currents Pins connected to 12 V Input currents Pins connected to 12 V TC Tamb = -40C 15 II 100 II 60 Tamb = 125C II Tamb = -40C Tamb = 25C Tamb = 25C 4, 6 190 nA C 150 nA A 30 110 nA C II 5.5 7.0 A C 100 II 4.0 5.5 A A Tamb = 125C II 3.0 4.5 A C Switch identification Tamb = -40C V8 0.47 VS 0.69 VS V C V8 0.47 VS 0.69 VS V A V8 0.47 VS 0.69 VS V C 8 5.0 Threshold 4.1 4.2 Min. VS = 12 V measured Tamb = -40C Output Z-diodes Z3, Z5 3.3 3.4 Symbol Output 3.1 3.2 Pin Supply 1.1 1.4 Test Conditions Threshold voltage 4.3 Switch identification Tamb = 25C Switch identification Tamb = 125C 8 0.6 VS *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 3 4557A-AUTO-11/02 Electrical Characteristics (Continued) VS = 9 V to 15 V, Tamb = -40C to +125C, unless otherwise specified (see Figure 1) No. 5 5.1 5.2 5.3 5.4 5.5 5.6 Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type* Switch Delay (RL = 10 kW connected from Pin 3 or Pin 5 to VBatt) Delay time Switch-on High to low Delay time Switch-off Low to high Tamb = -40C td(on) 3 4 6 s C Tamb = 25C td(on) 4 6 8 s C td(on) 5 7 9 s C td(off) 16 24 32 s C Tamb = 25C td(off) 18 30 50 s A Tamb = 125C td(off) 30 50 70 s C Tamb = 125C 3, 5 Tamb = -40C *) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter Figure 3. Timing Diagram V 4,6 (V) 12.00 11.90 V0 (V) t d(off) t d(on) 12 6 0 10 20 30 40 50 60 t (ms) Figure 4. Threshold Voltage = f (VBatt and Temperature) -V T ( mV ) 48 47 Tamb = 125C 46 95C 45 25C 44 -40C 43 42 41 40 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 V Batt ( V ) 4 U4793B 4557A-AUTO-11/02 U4793B Ordering Information Extended Type Number Package Remarks U4793B DIP8 - U4793B-FP SO8 - Package Information Package DIP8 Dimensions in mm 7.77 7.47 9.8 9.5 1.64 1.44 4.8 max 6.4 max 0.5 min 3.3 0.58 0.48 0.36 max 9.8 8.2 2.54 7.62 8 5 technical drawings according to DIN specifications 1 4 Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.8 5 technical drawings according to DIN specifications 1 4 5 4557A-AUTO-11/02 Atmel Headquarters Atmel Operations Corporate Headquarters Memory 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 487-2600 Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland TEL (41) 26-426-5555 FAX (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France TEL (33) 2-40-18-18-18 FAX (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France TEL (33) 4-42-53-60-00 FAX (33) 4-42-53-60-01 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany TEL (49) 71-31-67-0 FAX (49) 71-31-67-2340 1150 East Cheyenne Mtn. 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