features ? temperature and supply voltage compensated flashing frequency ? frequency doubling indicates lamp outage ? relay driver output with high current carrying capacity and low saturation voltage ? minimum lamp load for flasher operation: 1 w ? very low susceptibility to emi ? protection according to iso/tr 7637/1 level 4 1. description the bipolar integrated circuit u6043b is used in relay-controlled automotive flashers where a high level emc is required. lamp outage is indicated by frequency doubling during hazard warning as well as direction mode. flasher ic with 18-m shunt u6043b 4726c?auto?02/10
2 4726c?auto?02/10 u6043b 2. block diagram figure 2-1. car flasher application circuit me asu ring comp a r a tor v 6 - 49 mv 20 k 5 k 20 k 5 k 2 3 v p u l s e gener a tor ic gro u nd 20 k 1.5...2.2 k rel a y 7 3 8 1 + v s + 49 r 3 470 r 4 indic a tor l a mp s 49 a 4 5 k 2 k 1 k 3 c 1 r 1 6 2 49 a -comp a r a tor k 3 49 a -comp a r a tor k 2 21 w 21 w 5 w 21 w 21 w 5 w gnd - 3 1 r 2 s h u nt 1 8 m
3 4726c?auto?02/10 u6043b 3. pin configuration figure 3-1. pinning 1 2 3 4 8 7 6 5 gnd v s rel o s c o s c v s ld s i u604 3 b table 3-1. pin description pin symbol function 1 gnd ic ground 2 vs supply voltage 3 rel relay driver 4 osc oscillator 5 osc oscillator 6 vs supply voltage, sense 7 ld lamp outage detection 8 si start input (49a)
4 4726c?auto?02/10 u6043b 4. functional description 4.1 pin 1, gnd the u6043b is protected against damage in case of battery reversal via resistor r 4 to ground (?31). an integrated protection circuit together with external resistances r 2 and r 4 limits the cur- rent pulses in the ic. 4.2 pin 2, supply voltage, v s power the arrangement of the supply connections to pin 2 (and 6) 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. 4.3 pin 3, relay control output (driver) the relay control output is a high-side driver with a low saturation voltage. it is capable of driving a typical automotive relay with a minimum coil resistance of 60 . 4.4 pin 4 and 5, oscillator the flashing frequency, f 1 , is determined by the r 1 c 1 components as given by the following for- mula below (see figure 2-1 ): where c 1 47 f, r 1 = 6.8 k to 510 k in case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage fre- quency 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) 4.5 pin 6, supply voltage, sense for accurate monitoring via the shunt resist or, a minimized layer resistance from point v s /shunt to pin 6 is recommended. 4.6 pin 7, lamp outage detection the lamp current is monitored via an external shunt resistor r sh and an internal comparator k1 with its reference voltage of typically 49 mv (v s = 12v). the outage of one lamp is detected according to the following calculation: nominal current of 1 lamp: 21w/(v s = 12v): i lamp = 1.75a nominal current of 2 lamps: 2 21w/(v s = 12v): i lamp = 3.5a we recommend setting the detection threshold in the middle of the current range: i outage 2.7a thus, the shunt resistor is calculated as: r sh = v t (k1)/i outage r sh = 49 mv/2.7 a = 18 m f 1 1 r 1 c 1 1.5 ------------------------------------ - hz
5 4726c?auto?02/10 u6043b 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 case of shorted lamps. 4.7 pin 8, start input start condition for flashing: the voltage at pin 8 has to be below the k3 threshold (flasher switch closed). humidity and dirt may decrease the resistance between 49 a and gnd. if this leakage resis- tance is > 5 k , the ic is still kept in the 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 abov e the k2 threshold, during the dark phase it is below the k3 threshold. for proper start conditions a minimum lamp wattage of 1w is required.
6 4726c?auto?02/10 u6043b 5. absolute maximum ratings reference point pin 1 parameters symbol value unit supply voltage pin 2 and 6 v s 16.5 v surge forward current t p = 0.1 ms t p = 300 ms t p = 300 ms pin 2 and 6 pin 2 and 6 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 = 95c t amb = 60c dip8 so8 dip8 so8 p tot p tot p tot p tot 420 340 690 560 mw mw 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 6. thermal resistance parameters symbol value unit junction ambient dip8 so8 r thja r thja 110 160 k/w k/w 7. electrical characteristics typical values under normal operation in application circuit (see figure 2-1 ), v s (+49, pin 2 and 6) = 12v. reference point ground (?31), t amb = 25c, unless otherwise specified. parameters test conditions symbol min. typ. max. unit supply voltage range pin 2 and 6 v s 915v supply current dark phase, pin 2 and 6 bright phase, pin 2 and 6 i s i s 4.5 7.0 8 11 ma ma relay control output: saturation voltage reverse current pin 3 i o = 150 ma, v s = 9v v o i o 1.0 0.1 v ma start delay (delay time) first bright phase t on 10 ms frequency tolerance normal flashing f 1 ?5 +5 % bright period basic frequency f 1 control frequency f 2 f 1 f 2 47 37 53 45 % % frequency increase lamp outage f 2 2.15 f 1 2.3 f 1 hz control signal threshold v s = 15v, pin 7 v s = 9v, pin 7 v s = 12v, pin 7 v rs v rs v rs 50 43 47 53 45 49 57 47 52 mv mv mv leakage resistance 49a to gnd r p 45k lamp load p l 1w
7 4726c?auto?02/10 u6043b 9. package information 8. ordering information extended type number package remarks u6043b-my dip8 pb-free U6043B-MFPY so8 tubed, pb-free u6043b-mfpg3y so8 taped and reeled, pb-free package: dip8 dimensions in mm specifications according to din technical drawings 9.8 max. 2.54 nom. 0.3 0.36 max. b 0.4 a a b 1.54 0.65 8 4 1 5 9.6 0.1 7.62 0.15 3.6 0.1 4.2 0.3 1.8 6.7 2.5 1.2 0.3 0.53 0.05 6.3 0.1 8.75 0.8 3 x 2.54 = 7.62 nom. issue: 1; 16.01.02 drawing-no.: 6.543-5040.01-4
8 4726c?auto?02/10 u6043b package: so 8 dimensions in mm specifications according to din technical drawings issue: 1; 15.08.06 drawing-no.: 6.541-5031.01-4 14 85 0.2 5 0.2 3.8 0.1 6 0.2 3.7 0.1 4.9 0.1 3.81 0.4 1.27 0.1 +0.15 1.4
9 4726c?auto?02/10 u6043b 10. revision history please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 4726c-auto-02/10 ? section 7 ?electrical characteristics? on page 5 changed 4726b-auto-11/05 ? put datasheet in a new template ? first page: pb-free logo added ? page 6: ordering information changed
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