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U644B
Flasher, 18-mW Shunt, Extremly Low Current Consumption
Description
The bipolar integrated circuit, U644B, is used in relaycontrolled automotive flashers where a high level EMC is required. Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode. If the flasher module provides an 4-pin connector the control pin of U644B (Pin 6) can be used to operate the IC in an extremly low-current mode.
Features
D Frequency doubling indicates lamp outage D Frequency independent of temperature and voltage
change
D Minimum lamp load for flasher operation: D Very low susceptibility to EMI
1 W
D Relay driver output with high current-carrying
capacity and low saturation voltage
D Protection according to ISO TR7637/1 level 4 D Control input (Kl 15)
Ordering Information
Extended Type Number U644B U644B-FP Package DIP8 SO8 Remarks
Block Diagram
R5 10 kW 30 2 Measuring comparator K 1 V S - 49 mV 4 K1 20 kW 20 kW 7 6 15
C1
R4 Shunt
18 mW
K2 R1 Pulse generator 49 a Comparator K 2
2 kW 3 20 kW 8 Relay R3 49 a 3.3 kW 13 kW 30 V 1 GND R2 220 W GND -31
5
K3 49 a Comparator K 3 20 kW
12707
Figure 1. Application circuit as a car flasher with control input Resistor R1, R2 and R3: 1/4 Watt R2 for protection against continuous reversed polarity: 1 Watt
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U644B
+V S +49 2 Measuring comparator K 1 V S - 49 mV 4 K1 20 kW 20 k 7 6
C1
R4 Shunt
18 mW
K2 R1 Pulse generator 49 a Comparator K 2
2 kW 3 20 kW 8 Relay R3 49 a 3.3 kW 13 kW 30 V 1 GND R2 220 W GND -31
5
K3 49 a Comparator K 3 20 kW
12708
Figure 2. Application circuit as a car flasher without control input Resistor R1, R2 and R3: 1/4 Watt R2 for protection against continuous reversed polarity: 1 Watt
Application Note
In figure 1, the control input (Pin 6) is used to enable or disable U644B. If the ignition is switched off, the current consumption is less than 50 mA. In figure 2, Pin 6 is bridged to Pin 2, so U644B works like U6043B. Note that the resistor values of R2 and R3 are different from the U6043B (see application circuit).
Pin Description
Pin 1 2 3 4 5 6 7 8 Symbol GND VS REL OSC OSC VS LD SI Function IC ground Supply voltage VS Relay driver C1 Oscillator R1 Oscillator Supply voltage / or control input Lamp failure detection Start input (49a)
GND 1 2 8 SI
VS
7
LD
U644B
REL 3 4 6 Vs
OSC
5
OSC
13297
Figure 3. Pinning
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U644B
Functional Description
Pin 1, GND The integrated circuit is protected against damage via resistor R2 to ground (-31) in the case of battery reversal. An integrated protection circuit and the external resistances R1 and R2 limit the ac-current pulse in the IC. Pin 2, Supply voltage, VS - Power Connected directly to battery (Kl 30). 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. An integrated overvoltage detection disables the output at VS 20 V to protect the lamps during jump start Pin 7, Lamp outage detection The lamp current is monitored via an external shunt resistor R4 and an internal comparator K1 with its reference voltage of typ. 49 mV (VS = 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 / (VS = 12 V): Ilamp = 1.75 A Nominal current of 2 lamps: 2 x 21 W / (VS = 12 V): Ilamp = 3.5 A. The detection threshold is recommended to be set in the middle of the current range: Ioutage 2.7 A Thus the shunt resistor is calculated as: Rsh = VT (K1) / Ioutage Rsh = 49 mV/2.7 A = 18 mW. 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 the case of shortet lamps.
[
[
Pin 4 and 5 Oscillator Flashing frequency, f1, is determined by the R1C1 components as follows (see figure 1): 1 f1 Hz R 1 C 1 1.5 where
[ C 47 mF R + 6.8 kW to 510 kW
1 1
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, control input When the IC is powered by the battery Pin 6 is the control input to switch the IC to zero current consumption during stand-by.
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 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.
u
Absolute Maximum Ratings
Reference point Pin 1 Parameters Supply voltage Surge forward current tP = 0.1 ms tP = 300 ms tP = 300 ms Pin 2 Pin 2 Pin 2 Pin 8 Pin 3 DIP8 SO8 DIP8 SO8 Symbol VS IFSM IFSM IFSM IO Ptot Ptot Ptot Ptot Value 18 1.5 1.0 50 0.3 230 300 690 560 Unit V A A mA A mW mW mW mW
Output current Power dissipation
Tamb = 120C Tamb = 105C Tamb = 60C Tamb = 60C
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U644B
Absolute Maximum Ratings (continued)
Parameters Junction temperature Ambient temperature range Storage temperature range Symbol Tj Tamb Tamb Tstg Value 150 -40 to +120 -40 to +105 -55 to +150 Unit C C C C
DIP8 SO8
Thermal Resistance
Parameters Junction ambient DIP8 SO8 Symbol RthJA RthJA Value 110 160 Unit K/W K/W
Electrical Characteristics
Typical values under normal operation in application circuit figure 1, VS (+49, Pin 2) = 12 V. Reference point ground (-31), Tamb = 25C unless otherwise specified Parameters Supply voltage range Supply current Test Conditions / Pin Pin 2 Dark phase or stand-by Pin 2 Bright phase Pin 2 IO = 300 mA Pin 3 Symbol VS (+49) IS IS VO IO RL 60 19.0 Min. Typ. 8 to 18 5 6 Max. 7 10 1.3 0.1 Unit V mA mA V mA
Supply current Relay output, saturation voltage Relay output, Pin 3 reverse current Relay coil resistance Relay output overvoltage detection (relay disabled) Start delay (first bright phase) Frequency determining resistor Frequency determining capacitor Frequency tolerance (normal flashing, basic frequency f1 not including the tolerance of the external components R1 and C1) Bright period (basic frequency f1) Bright period (control frequency f2) Frequency increase (lamp failure) Control signal threshold Vs = 18 V Pin 7 Vs = 8 V Pin 7 Vs = 13.5 V Pin 7 Resistance between 49a to ground for stand-by Lamp load
W
20.2 22.5 10 V ms kW
ton R1 C1 f1 f1 f2 f2 VR3 VR3 VR3 RP PL -6.5 6.8
510 47 + 6.5
mF
%
45 35 2.1 f1 53 40.5 47.5 1
57 43.6 51 2
55 45 2.4 f1 61 46.6 54.5 5.6
% % Hz mV mV mV kW W
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U644B
Package Information
Package DIP8
Dimensions in mm
9.8 9.5 1.64 1.44 7.77 7.47
4.8 max 6.4 max 0.5 min 0.58 0.48 7.62 8 5 2.54 3.3 0.36 max 9.8 8.2
technical drawings according to DIN specifications 13021
1
4
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10
5.2 4.8 3.7
0.2 3.8 6.15 5.85
technical drawings according to DIN specifications 13034
8
5
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U644B
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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