U644B TEMIC | Alldatasheet
Document overview
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Technical content
Features
/C0068Frequency doubling indicates lamp outage /C0068Frequency independent of temperature and voltage change /C0068Relay driver output with high current-carrying capacity and low saturation voltage /C0068Minimum lamp load for flasher operation: /C00211 W /C0068Very low susceptibility to EMI /C0068Protection according to ISO TR7637/1 level 4 /C0068Control input (Kl 15)
Ordering Information
Extended Type Number Package Remarks U644B DIP8 U644B-FP SO8 Block Diagram V S –49 mV Pulse generator GND 20 k/C0087 3.3 k/C0087 Relay 49 a K 2 K 1 K 3 C 1 R 1 12707 R 3 49 a Comparator K 2 49 a Comparator K 3 2 k/C0087 20 k/C0087 20 k/C0087 20 k/C0087 13 k/C0087 30 V Shunt R 4 GND –31 R 5 10 k/C0087 18 m/C0087 Measuring comparator K1 220 /C0087 R 2 Figure 1. Application circuit as a car flasher with control input
Figure 2. Application circuit as a car flasher without control input consumption is less than 50 /C0109A. different from the U6043B (see application circuit).
1 GND IC ground
2 V S Supply voltage VS
3 REL Relay driver
4 OSC C 1 Oscillator
5 OSC R 1 Oscillator
6 V S Supply voltage / or control input
7 LD Lamp failure detection
8 SI Start input (49a)
Figure 3. Pinning
Rev. A2, 25-Feb-97 3 (6) Functional Description Pin 1, GND The integrated circuit is protected against damage via resistor R 2 to ground (–31) in the case of battery reversal. An integrated protection circuit and the external resistances R 1 and R2 limit the ac-current pulse in the IC. Pin 2, Supply voltage, VS - Power Connected directly to battery (Kl 30). Pin 3, Relay control output (driver) The relay control output is a high-side driver with a low saturation voltage and capable to drive a typical automo- tive relay with a minimum coil resistance of 60 /C0087. An integrated overvoltage detection disables the output at V S /C0091 20 V to protect the lamps during jump start Pin 4 and 5 Oscillator Flashing frequency, f1, is determined by the R1C 1 components as follows (see figure 1): f1 /C00911 R 1 /C0032C 1 /C00321.5 Hz where C 1 /C0020 47 /C0109F R 1 /C0043 6.8 k/C0087 to 510 k/C0087 In the case of a lamp outage (see Pin 7) the oscillator frequency is switched to the lamp outage frequency f2 with f2 /C0091 2.2 f1. Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode: 40% (bright phase) Pin 6, Supply voltage, control input When the IC is powered by the battery Pin 6 is the control input to switch the IC to zero current consumption during stand-by. Pin 7, Lamp outage detection The lamp current is monitored via an external shunt resistor R 4 and an internal comparator K1 with its reference voltage of typ. 49 mV (VS = 12 V). The outage of one lamp out of two lamps is detected according to the following calculation: Nominal current of 1 lamp: 21 W / (V S = 12 V): Ilamp = 1.75 A Nominal current of 2 lamps: 2 x 21 W / (VS = 12 V): Ilamp = 3.5 A. The detection threshold is recommended to be set in the middle of the current range: I outage /C0091 2.7 A Thus the shunt resistor is calculated as: R sh = VT (K1) / Ioutage R sh = 49 mV/2.7 A = 18 m/C0087. Comparator K1‘s reference voltage is matched to the characteristics of filament lamps (see “control signal threshold” in the data part). The combination of shunt resistor and resistance of wire harness prevents Pin 7 from a too high voltage in the case of shortet lamps. Pin 8, Start input Start condition for flashing: the voltage at Pin 8 has to be below K3 threshold (flasher switch closed). Humidity and dirt may decrease the resistance between 49 a and GND. If this leakage resistance is /C0117 5 k/C0087 the IC is still kept in its off-condition. In this case the voltage at Pin 8 is between the thresholds of comparators K2 and K3. During the bright phase the voltage at pin 8 is above the threshold, during the dark phase it is below the K3 threshold. For proper start conditions a minimum lamp wattage of 1 W is required. Absolute Maximum Ratings Reference point Pin 1 Parameters Symbol Value Unit Supply voltage Pin 2 V S 18 V Surge forward current tP = 0.1 ms Pin 2 tP = 300 ms Pin 2 tP = 300 ms Pin 8 IFSM IFSM IFSM 1.5 1.0 A A mA Output current Pin 3 IO 0.3 A Power dissipation Tamb = 120°C DIP8 Tamb = 105°C SO8 Tamb = 60°C DIP8 Tamb = 60°C SO8 Ptot Ptot Ptot Ptot 230 300 690 560 mW mW mW mW
Rev. A2, 25-Feb-97 4 (6) Absolute Maximum Ratings (continued) Parameters Symbol Value Unit Junction temperature Tj 150 °C Ambient temperature range DIP8 SO8 Tamb Tamb –40 to +120 –40 to +105 Storage temperature range Tstg –55 to +150 °C Thermal Resistance Parameters Symbol Value Unit Junction ambient DIP8 SO8 R thJA R thJA 110 160 K/W K/W
Electrical Characteristics
Typical values under normal operation in application circuit figure 1, VS (+49, Pin 2) = 12 V . Reference point ground (–31), Tamb = 25°C unless otherwise specified Parameters Test Conditions / Pin Symbol Min. Typ. Max. Unit Supply voltage range Pin 2 V S (+49) 8 to 18 V Supply current Dark phase or stand-by Pin 2 IS 5 7 mA Supply current Bright phase Pin 2 IS 6 10 mA Relay output, saturation voltage IO = 300 mA Pin 3 V O 1.3 V Relay output, reverse current Pin 3 IO 0.1 mA Relay coil resistance R L 60 /C0087 Relay output overvoltage detection (relay disabled) 19.0 20.2 22.5 V Start delay (first bright phase) ton 10 ms Frequency determining resistor R 1 6.8 510 k/C0087 Frequency determining capacitor C 1 47 /C0109F Frequency tolerance (normal flashing, basic frequency f1 not including the tolerance of the external compo- nents R1 and C1) Δf1 –6.5 + 6.5 % Bright period (basic frequency f1) Δf1 45 55 % Bright period (control frequency f2) Δf2 35 45 % Frequency increase (lamp failure) f2 2.1/C0032f1 2.4/C0032f1 Hz Control signal thresholdV s = 18 V Pin 7 V s = 8 V Pin 7 V s = 13.5 V Pin 7 V R3 V R3 V R3 40.5 47.5 43.6 46.6 54.5 mV mV mV Resistance between 49a to ground for stand-by R P 2 5.6 k/C0087 Lamp load PL 1 W
Rev. A2, 25-Feb-97 5 (6)
Package Information
9.8 9.5 Dimensions in mm 1.64 1.44 4.8 max 0.5 min 3.3 0.58 0.48 7.62 2.54 6.4 max 0.36 max 9.8 8.2 7.77 7.47 technical drawings according to DIN specifications 13034 technical drawings according to DIN specifications Dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2
Rev. A2, 25-Feb-97 6 (6) Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423