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U6433B
Flasher, 18-mW Shunt, Frequency Doubling Disabling
Description
The design of the U6433B is similar to that of U6043B, both devices have the same excellent EMC (Electro Magnetic Capability) and protection features. 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 frequency doubling. This feature is especially important with respect to the US automotive industry. During direction mode the U6433B works like other flashers, i.e., frequency doubling in the case of lamp outage.
Features
D Temperature and voltage compensated frequency D Warning indication of lamp failure by means of frequency doubling can be disabled D Voltage dependence of the car indicator lamps compensated for lamp failure D Relay output with high current carrying capacity and low saturation voltage D Minimum lamp load for flasher operationy 1 W D Load-dump protection D Very low susceptibility to EMI D Protection according to ISO/TR 7637/1 level 4
Block Diagram
6 G5 + K1 - + K4 - VS - 8 mV 4 + K5 - G4 5 K3 G2 VS - 4 V K2 VS - 49 mV 2 VS
C1 4.7 mF
D1 23 V
R1 82 kW
49 a
VS-6 V 3 7
VS - 8 V 8 1
Shunt VS
18 m W
R3
470 W
R4
R2 PL>1 W 1.5 kW
94 9289
Figure 1. Application circuit as a car flasher
Ordering Information
Extended Type Number U6433B-FP Package SO8 Remarks
Rev. A5, 11-Apr-01
1 (5)
U6433B
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND VS REL OSC OSC VS LD SI IC ground Supply voltage Relay driver Oscillator Oscillator Supply voltage Lamp failure detection Start input (49a)
Figure 2. Pinning OSC 4 5 OSC
13298
Function
GND 1 8 SI
VS
2
7
LD
U6433B
REL 3 6 Vs
Functional Description
Pin 1, GND The integrated circuit is protected against damage via resistor R4 to ground (-31) in the case of battery reversal. An integrated protection circuit together with external resistances R2 and R4 limits the current pulses in the IC. 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. 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 automotive relay with a minimum coil resistance of 60 W. Pin 4 and 5 Oscillator Flashing frequency, f1, is determined by the R1C1 components as follows (see figure 1): f1 [ where R1 1 C1 1.5 Hz
Pin 7, Lamp outage detection 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 = 12 V. With a measuring resistance of R3 = 18 mW, the frequency change-over is reached at a lamp load of 21 W + 11.4 W. The variation of the control signal threshold supply voltage takes into account the PTC characteristic of filament lamps. Control Signal Threshold 2 (8-mV Comparator K4) A voltage drop at R3 between 49 mV and 8 mV shunt resistor lets the flasher work in frequency doubling mode. If the voltage drop decreases to a value below VR3MAX = 8 mV, frequency doubling is disabled. This can be achieved either with a switch which by-passes the shunt resistor (e.g., a special 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 one to Pin 2. Flasher operation starts with a lamp load of PL y 1 W. 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 u 5 kW 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 1 W is required.
C1 47 mF R1 + 6.8 kW to 510 kW
In the case of a lamp outage (see 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) 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.
2 (5)
Rev. A5, 11-Apr-01
U6433B
Absolute Maximum Ratings
Reference point Pin 1 Parameters Supply voltage Surge forward current Pins 2 and 6 tp = 0.1 ms Pins 2 and 6 tp = 300 ms Pins 2 and 6 tp = 300 ms Pin 8 Pin 3 SO 8 SO 8 Symbol VS IFSM IO Ptot Tj Tamb Tstg Value 18 1.5 1.0 30.0 0.3 340 560 150 -40 to +105 -55 to +150 Unit V A A mA A mW mW _C _C _C
Output current Power dissipation
Tamb = 95_C Tamb = 60_C
Junction temperature Ambient temperature range Storage temperature range
Thermal Resistance
Parameters Junction ambient SO8 Symbol RthJA Value 160 Unit K/W
Electrical Characteristics
Typical values under normal operation of the application circuit shown in figure 1, VS = 12 V (Pins 2 and 6). Tamb = 25_C, reference point ground (-31), unless otherwise specified. Parameters Supply voltage range Supply current, dark phase Supply current, bright phase Relay output, saturation voltage Relay output reverse current Relay coil resistance Start delay Frequency determining resistor Frequency determining capacitor Frequency tolerance Normal flashing, basic frequency f1 not including the tolerances of the external components R1 and C1 First bright phase Test conditions / Pin Pins 2 and 6 Pins 2 and 6 Pins 2 and 6 IO = 150 mA, VS = 9 V Symbol VS IS IS VO Pin 3 Pin 3 IO RL ton R1 C1 f1 -5 6.8 60 10 510 47 +5 0.1 mA W ms kW mF % Min. 9 4.5 7.0 Typ. Max. 16.5 8 11 1.0 Unit V mA mA V
Rev. A5, 11-Apr-01
3 (5)
U6433B
Electrical Characteristics (continued)
Typical values under normal operation of the application circuit shown in figure 1, VS = 12 V (Pins 2 and 6). Tamb = 25_C, reference point ground (-31), unless otherwise specified. Parameters Bright period Bright period Frequency increase Control signal threshold 1 Test conditions / Pin Basic frequency f1, VS = 9 - 15 V Control frequency f2, VS = 9 - 15 V Lamp failure, VS = 9 - 15 V VS = 15 V VS = 9 V VS = 12 V 49a to GND Symbol f1 f2 f2 Pin 7 VR3 VR3 Rp PL 1 Min. 47 37 2.15 50 43 47 2 f1 53 45 49 Typ. Max. 53 45 2.3 57 47 51 10 5 f1 Unit % % Hz
mV mV kW W
Control signal threshold 2 Leakage resistance Lamp load
Package Information
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 13034
1
4
4 (5)
Rev. A5, 11-Apr-01
U6433B
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany 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. Atmel Germany GmbH 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. Atmel Germany GmbH 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 Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers 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. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A5, 11-Apr-01
5 (5)

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