U2043B telefunken semiconductors rev. a2, 28-nov-97 1 (6) flasher, 30-m shunt, pilot lamp to gnd or v batt description the integrated circuit U2043B is used in relay-controlled automotive flashers where a high emc level is required. a lamp outage is indicated by frequency doubling during hazard mode as well as direction mode. the pilot lamp can be connected either to v batt or gnd. features temperature and voltage compensated frequency warning indication of lamp failure by means of frequency doubling minimum lamp load for flasher operation 10 w relay output with high current carrying capacity and low saturation voltage low susceptibility to emi ordering information extended type number package remarks U2043B dip8 U2043Bfp so8 block diagram v 6 81 mv 23 v pulse generator ic ground 3.8 k 3.3 k relay 7 3 8 + v s + 49 r 3 100 r 1 49 a 4 5 k 1 k 3 c 1 r 1 6 2 13283 49 acomparator 21 w 21 w 5 w 21 w 21 w 5 w gnd 31 r 2 indicator lamps measuring comparator shunt 30 m v 6 5 v 1 pilot lamp 5 w pilot lamps figure 1.
U2043B telefunken semiconductors rev. a2, 28-nov-97 2 (6) pin description pin symbol function 1 gnd ic ground 2 v s supply voltage v s 3 rel relay driver 4 osc c 1 oscillator 5 osc r 1 oscillator 6 v s supply voltage v s 7 ld lamp failure detection 8 si start input (49a) 1 2 3 4 8 7 6 5 gnd vs rel osc osc vs ld 12749 si U2043B figure 2. pinning functional description pin 1 , gnd the integrated circuit is protected against damage via resistor r 4 to ground (31) in the case of battery reversal. an integrated protection circuit together with external resistances r 2 and r 4 limits the current pulses in the ic. pin 2 , supply voltage, v s - power the arrangement of the supply connections to pin 2 must be so as to ensure that, on the connection printed circuit board (pcb), the resistance of v s to pin 6 is lower than that to pin 2. 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 . pin 4 and 5 oscillator flashing frequency, f 1 , is determined by the r 1 c 1 compo- nents as follows (see figure 1): f 1 1 r 1 c 1 1.5 hz where c 1 47 f r 1 6.8 k to 510 k in the case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage frequency f 2 with f 2 2.2 f 1 . duty cycle in normal flashing mode: 50% duty cycle in lamp outage mode: 40% (bright phase) pin 6 , supply voltage, sense for accurate monitoring via the shunt resistor, a mini- mized layer resistance from point v s / shunt to pin 6 is recommended. pin 7 , lamp outage detection the lamp current is monitored via an external shunt resistor r 3 and an internal comparator k1 with its reference voltage of typ. 81 mv (v s = 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): i lamp = 1.75 a nominal current of 2 lamps: 2 x 21 w / (v s = 12 v): i lamp = 3.5 a. the detection threshold is recommended to be set in the middle of the current range: i outage 2.7 a thus the shunt resistor is calculated as: r 3 = v t (k1) / i outage r 3 = 81 mv/2.7 a = 30 m . comparator k1`s reference voltage is matched to the characteristics of filament lamps (see acontrol signal thresholdo 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 shorted lamps. pin 8 , start input start condition for flashing: the voltage at pin 8 has to be less than v s 5 v (flasher switch closed). humidity and dirt may decrease the resistance between 49 a and gnd. if this leakage resistance is 5 k the ic is still kept in its off-condition. in this case the voltage at pin 8 is greater than v s 5 v. during the bright phase the voltage at pin 8 is above the k2 threshold, during the dark phase it is below the k3 threshold. for proper start conditions a minimum lamp wattage of 10 w is required.
U2043B telefunken semiconductors rev. a2, 28-nov-97 3 (6) absolute maximum ratings reference point pin 1 parameters symbol value unit supply voltage pins 2, 6 v s 16.5 v surge forward current t p = 0.1 ms pins 2, 6 t p = 2 ms pins 2, 6 t p = 2 ms pin 8 i fsm i fsm i fsm 1.5 1.0 50 a a ma output current pin 3 i o 0.3 a power dissipation t amb = 95 c dip8 so8 p tot p tot 420 340 mw mw t amb = 60 c dip8 so8 p tot p tot 690 560 mw mw junction temperature t j 150 c ambient temperature range t amb 40 to +95 c storage temperature range t stg 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, v s (+49, pins 2 and 6) = 12 v. reference point ground (31), t amb = 25 c, unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit supply voltage range pins 2, 6 v s (+49) 9 to 15 v supply current dark phase or stand-by pins 2, 6 i s 4.5 8 ma supply current bright phase pins 2, 6 i s 7.0 11 ma relay output saturation voltage i o = 150 ma, v s = 9 v pin 3 v o 1.0 v relay output reverse current pin 3 i o 0.1 ma relay coil resistance r l 60 start delay first bright phase t on 10 ms frequency determining resistor r 1 6.8 510 k frequency determining capacitor c 1 47 f
U2043B telefunken semiconductors rev. a2, 28-nov-97 4 (6) electrical characteristics (continued) parameters test conditions / pins symbol min. typ. max. unit frequency tolerance normal flashing, basic fre- quency f 1 not including the tolerance of the external components r 1 and c 1 f 1 5 +5 % bright period basic frequency f 1 f 1 47 53 % bright period control frequency f 2 f 2 37 45 % frequency increase lamp outage f 2 2.15 f 1 2.3 f 1 hz control signal threshold v s = 15 v pin 7 v s = 9 v v s = 12 v v r3 v r3 v r3 85 66 76 91 71 81 97 76 87 mv mv mv leakage resistance 49a to gnd r p 2 5 k lamp load p l 10 w
U2043B telefunken semiconductors rev. a2, 28-nov-97 5 (6) package information 13039 9.9 max package dip8 dimensions in mm 1.64 1.44 4.5 3.9 0.5 min 2.5 0.58 0.48 7.62 2.54 6.4 max 0.39 max 9.75 8.15 7.82 7.42 85 14 technical drawings according to din specifications 13034 technical drawings according to din specifications package so8 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 85 85
U2043B telefunken semiconductors rev. a2, 28-nov-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
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