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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: 1W Very Low Susceptibility to EMI Protection According to ISO/TR 7637/1 Level 4
Flasher IC with 30-m Shunt U643B
1. Description
The bipolar integrated circuit U643B 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.
Rev. 4727B-AUTO-09/05
2. Block Diagram
Figure 2-1. Car Flasher Application Circuit, Resistor R1 and R2: 0.25W; R4 for Protection Against Continuous Reversed Polarity: 0.5W
+ VS + 49 6 C1 4 K1 Measuring comparator K 1 V 6-81 mV 20 k 5 k 7 2 R3 Shunt 30 m
K2 R1 Pulse generator 3 49 a-Comparator K 2 20 k 49 a-Comparator K 3 K3 5 20 k 23 V 5 k IC Ground 1 R4 470 5 W 21 W 21 W 21 W 21 W 5 W Indicator lamps GND - 31 8 Relay R2 49 a 1.5...2.2 k
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U643B
3. Pin Configuration
Figure 3-1. Pinning
GND
1
8
SI
VS
2
7
LD
U643B
REL 3 6 VS OSC
OSC
4
5
Table 3-1.
Pin 1 2 3 4 5 6 7 8
Pin Description
Symbol GND VS REL OSC OSC VS LD SI Function IC ground Supply voltage VS Relay driver C1 Oscillator R1 Oscillator Supply voltage VS Lamp failure detection Start input (49a)
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4. Functional Description
4.1 Pin 1, GND
The U643B is protected against damage in case of battery reversal via resistor R4 to ground (-31). An integrated protection circuit together with external resistances R2 and R4 limits the current pulses in the IC.
4.2
Pin 2, Supply Voltage, VS 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 VS 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, f1, is determined by the R1C1 components as given by the formula below (see Figure 2-1 on page 2):
1 f 1 ------------------------------------ Hz R 1 x C 1 x 1.5
where C1 47 F, R1 = 6.8 k to 510 k In case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage frequency f2 with f2 2.2 x f1. 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 resistor, a minimized layer resistance from point VS/shunt to pin 6 is recommended.
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4.6 Pin 7, Lamp Outage Detection
The lamp current is monitored via an external shunt resistor R3 and an internal comparator K1 with its reference voltage of typically 81 mV (VS = 12V). The outage of one lamp is detected according to the following calculation: Nominal current of 1 lamp: 21W / (VS = 12V): Ilamp = 1.75A Nominal current of 2 lamps: 2 x 21W / (VS = 12V): Ilamp = 3.5A. The detection threshold should be set in the middle of the current range: Ioutage 2.7A Thus, the shunt resistor is calculated as: R3 = VT (K1) / Ioutage R3 = 81 mV/2.7A = 30 m Comparator K1's reference voltage is matched to the characteristics of filament lamps (see Control Signal Threshold in "Electrical Characteristics" on page 6). The combination of shunt resistor and resistance of wire harness prevents pin 7 from a too high voltage in the case of shorted lamps.
4.7
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 49a and GND. If this leakage resistance is > 5 k, the IC still remains 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 above 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.
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5. Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Reference point pin 1 Parameters Supply voltage Surge Forward Current tP = 0.1 ms tP = 300 ms tP = 300 ms Output current Power Dissipation Tamb = 95C Tamb = 60C Junction temperature Ambient temperature range Storage temperature range DIP 8 SO8 DIP 8 SO8 Ptot Ptot Ptot Ptot TJ Tamb Tstg 420 340 690 560 150 -40 to +95 -55 to +150 mW mW mW mW C C C Pins 2 and 6 Pins 2 and 6 Pin 8 Pin 3 IFSM IFSM IFSM IO 1.5 1.0 50 0.3 A A mA A Pins 2 and 6 Symbol VS Value 16.5 Unit V
6. Thermal Resistance
Parameters Junction ambient DIP8 SO8 Symbol RthJA RthJA Value 110 160 Unit K/W K/W
7. Electrical Characteristics
Typical values under normal operation in application circuit (see Figure 2-1 on page 2), VS (+49, pin 2 and 6) = 12V. Reference point ground (-31), Tamb = 25C, unless otherwise specified. Parameters Supply voltage range Supply current Relay output: Saturation voltage Reverse current Start delay Frequency tolerance Bright period Frequency increase Control signal threshold Leakage resistance Lamp load Basic frequency f1 Control frequency f2 Lamp outage VS = 15V, pin 7 VS = 9V, pin 7 VS = 12V, pin 7 49a to GND First bright phase Test Conditions Pins 2 and 6 Pins 2 and 6 Dark phase Bright phase Pin 3 IO = 150 mA, VS = 9V with resistance = 60 Symbol VS (+49) IS IS Min. Typ. 9 to 15 4.5 7.0 8 11 Max. Unit V mA mA
VO IO ton f1 f1 f2 f2 VR3 VR3 VR3 RP PL 1 -5 47 37 2.15 f1 85 66 76 91 71 81 4
1.0 0.1 10 +5 53 45 2.3 f1 97 76 87 5
V mA ms % % % Hz mV mV mV k W
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8. Ordering Information
Extended Type Number U643B-MY U643B-MFPY U643B-MFPG3Y Package DIP8 SO8 SO8 Remarks Pb-free Tubed, Pb-free Taped and reeled, Pb-free
9. Package Information
9.1 DIP8
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9.2
SO8
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7
technical drawings according to DIN specifications
1
4
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 * * * * Put datasheet in a new template Updated text to new style guide First page: Pb-free logo added Page 6: Ordering Information changed
4727B-AUTO-09/05
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4727B-AUTO-09/05

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