U6433B_05 ATMEL | Alldatasheet
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- Temperature and Voltage Compensated Frequency Warning Indication of Lamp Failure by Means of Frequency Doubling can be Disabled Voltage Dependence of the Car Indicator Lamps Compensated for Lamp Failure Relay Output with High Current Carrying Capacity and Low Saturation Voltage Minimum Lamp Load for Flasher Operation ≥ 1W Load-dump Protection Very Low Susceptibility to EMI Protection According to ISO/TR 7637/1 Level 4 1. Description The design of the U6433B is similar to th at of U6043B, both devices have the same excellent EMC (Elect ro Magnetic Capability) and pr otection featur es. The U6433B includes an additional 8-mV comparator and a logical connection with the frequency doubling stage. This combination can be used for a hazard switch which bypasses the external shunt resistor to disable the f requency doubling. This feature is especially important with respect to the US automotive industry. During direction mode the U6433B works like other flashers, that is, frequency doubling in the case of lamp outage. Flasher, 18-mΩ Shunt, Frequency Doubling Disabling U6433B Rev. 4810B–AUTO–10/05
4810B–AUTO–10/05 U6433B Figure 1-1. Block Diagram VS - 49 mV G2+ VS 8173 23 V 470 Ω 4.7 µF 82 kΩ VS - 4 V VS 49 a Shunt 18 mΩ 1.5 kΩPL >1 W VS - 8 mV VS - 6 V VS - 8 V
4810B–AUTO–10/05 U6433B 2. Pin Configuration Figure 2-1. Pinning SO8 GND REL OSC SI LD VS OSC U6433B VS Table 2-1. 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
7 LD Lamp failure detection
8 SI Start input (49a)
4810B–AUTO–10/05 U6433B 3. Functional Description
3.1 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 R4 limits the current pulses in the IC.
3.2 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 con- nection printed circuit board (PCB), the resistance of V S to pin 6 is lower than that to pin 2.
3.3 Pin 3, Relay Control Output (Driver)
The relay control output is a high-side driver with a low saturation voltage and is capable of driv- ing a typical automotive relay with a minimum coil resistance of 60Ω.
3.4 Pins 4 and 5, Oscillator
The flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1-1 on page 2): where C1 ≤ 47 µF R1 + 6.8 kΩ to 510 kΩ In the case of a lamp outage (s ee pin 7) the oscillator frequency is switched to the lamp outage frequency f2 with f2 ≈ 2.2 × f1. Duty cycle in normal flashing mode: 50% Duty cycle in lamp outage mode: 40% (bright phase)
3.5 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.
3.6 Pin 7, Lamp Outage Detection
3.6.1 Control Signal Threshold 1 (49-mV Comparator K1)
The detection point for lamp failure can be calculated from the control signal threshold, typically 49 mV with VS = 12V. With a measuring resistance of R3 = 18 mΩ, the frequency change-over is reached at a lamp load of 21W + 11.4W. The variation of the control signal threshold supply volt- age takes into account the PTC characteristic of filament lamps.
4810B–AUTO–10/05 U6433B
3.6.2 Control Signal Threshold 2 (8-mV Comparator K4)
A voltage drop between 49 mV to 8 mV at R 3 shunt resistor lets the flasher work in frequency doubling mode. If the voltage drop decreases to a value below V R3MAX = 8 mV, frequency doubling is disabled. This can be achieved either with a switch which bypasses the shunt resistor (for example, a spe- cial hazard warning switch) or with a small lamp load. The arrangement of the supply connections to pins 2 and 6 must ensure that, on the connection PCB, the layer resistance from VS to pin 6 is lower than the resistance to pin 2. Flasher operation starts with a lamp load of PL ≥ 1W.
3.7 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 49a and GND. If this leakage resistance is > 5 k Ω, 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 K2 threshold; during the dark phase it is below the K3 threshold. For proper start conditions, a minimum lamp wattage of 1W is required. 4. 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 Symbol Value Unit Supply voltage, pins 2 and 6 V S 18 V Surge forward current tp = 0.1 ms, pins 2 and 6 tp = 300 ms, pins 2 and 6 tp = 300 ms, pin 8 IFSM 1.5 1.0 30.0 A A mA Output current, pin 3 I O 0.3 A Power dissipation Tamb = 95°C, SO8 Tamb = 60°C, SO8 Ptot 340 560 mW mW Junction temperature T j 150 °C Ambient temperature range T amb –40 to +105 °C Storage temperature range T stg –55 to +150 °C 5. Thermal Resistance Parameters Symbol Value Unit Junction ambient SO8 R thJA 160 K/W
4810B–AUTO–10/05 U6433B 6. Electrical Characteristics Typical values under normal operation of the application circuit shown in Figure 1-1 on page 2, VS = 12V (pins 2 and 6). Tamb = 25°C, reference point ground (–31), unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit Supply voltage range Pins 2 and 6 V S 9 16.5 V Supply current, dark phase Pins 2 and 6 I S 4.5 8 mA Supply current, bright phase Pins 2 and 6 I S 7.0 11 mA Relay output, saturation voltage IO = 150 mA, VS = 9V, pin 3 VO 1.0 V Relay output reverse current Pin 3 I O 0.1 mA Relay coil resistance R L 60 Ω Start delay First bright phase t on 10 ms Frequency determining resistor R 1 6.8 510 k Ω Frequency determining capacitor C 1 47 µF Frequency tolerance Normal flashing, basic frequency f1 not including the tolerances of the external components R1 and C1 ∆f1 –5 +5 % Bright period Basic frequency f 1, VS = 9V to 15V ∆f1 47 53 % Bright period Control frequency f 2, VS = 9V to 15V ∆f2 37 45 % Frequency increase Lamp failure, V S = 9V to 15V f 2 2.15 × f1 2.3 × f1 Hz Control signal threshold 1 VS = 15V, pin 7 VS = 9V VS = 12V VR3 mV Control signal threshold 2 V R3 21 0 m V Leakage resistance 49a to GND R p 5k Ω Lamp load PL 1W
4810B–AUTO–10/05 U6433B 8. Package Information 9. Revision History 7. Ordering Information Extended Type Number Package Remarks U6433B-MFPY SO8 Tubed, Pb-free U6433B-MFPG3Y SO8 Taped and reeled, Pb-free 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 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 4810B-AUTO-08/05
- Put datasheet in a new template
- Updated text to new style guide
- First page: Pb-free logo added
- Page 7: Ordering Information changed
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