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Features
* Temperature and Voltage Compensated Frequency * Warning Indication of Lamp Failure by Means of Frequency Doubling only in Direction * * * * * * *
Mode Voltage Dependence of the Car Indicator Lamps also Compensated for Lamp Failure Relay Output with High Current-carrying Capacity and Low Saturation Voltage Load-dump Protection Minimum Lamp Load for Flasher Operation 1W Low Susceptibility to EMI Extremely Low Standby Current of 10 A Protection According to ISO/TR 7637/1 Level 4 with External Capacitor (C2)
1. Description
The U6432B is an advanced automotive flasher IC which provides low standby current. Its basic function is equal to Atmel's flasher IC U6043B but low current consumption and frequency doubling disabling make outstanding differences.
Low-power Flasher IC with 18-m Shunt U6432B
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2. Block Diagram
Figure 2-1. Car Flasher Application
2
K3
VS
6
G5
+ -
V S-57 mV
VS
D1 21 V T1 C2 10 F
G3 C1 4.7 F
K2
+ 6.2 V D2
+ R1 82 k G4 5 4 -
K1
V S-57 mV
G2
G1
T2 V S-6 V
49 a 3 Shunt VS R3 18 m R4 5.1 k R6 470 7 8 1
R2 1.2 k
PL >1 W
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U6432B
3. Pin Configuration
Figure 3-1. Pinning
GND VS REL 1 2 8 7 SI LD
U6432B
3 4 6 5 VS OSC
OSC
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 Relay driver Oscillator Oscillator Supply voltage Lamp failure detection Start input (49a)
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4. Functional Description
4.1 Pin 1, GND
The U6432B is protected against damage in case of battery reversal via resistor R 4 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 (and 6) 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
Pins 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.
4.6
4.6.1
Pin 7
Control Signal Threshold (49-mV Comparator) 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 m, the frequency change-over is reached at a lamp load of 21W + 11.4W. The variation of the control signal threshold supply voltage takes into account the PTC characteristic of filament lamps.
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U6432B
4.6.2 Control Signal Threshold 2 (15-mV Comparator) A voltage drop at the shunt resistor R3 between 49 mV and 15 mV lets the flasher work in frequency doubling mode. If the voltage drop decreases to a value below VR3MAX = 15 mV, frequency doubling is disabled. This can be achieved either with a switch which bypasses the shunt resistor (for example, a special hazard warning switch) or with a small lamp load. Flasher operation starts with a lamp load of PL 1W.
4.7
Pin 8, Start Input
Start condition for flashing: * Voltage at pin 8 (see Figure 2-1 on page 2) * V8 VS - (VBE(T1) + VZ(D2)) Condition for standby: The resistor R2 between VS and pin 8 provides an extremely low standby current (IS 10 A). The leakage current depends on the pull-up resistor R2 according to the following formula: ILeak (VBE(T1) + VZ(D2)) / R2
5. Application Hint
In order to achieve a high-level immunity against "electrical interference by conduction and coupling" according to ISO/TR 7637/1 test level 4, an electrolytic capacitor C2 = 10 F (25V) between pin 1 and 2 - mounted close to the IC - is highly recommended.
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6. 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 SO8 SO8 Ptot Ptot TJ Tamb Tstg 340 560 150 -40 to +105 -55 to +150 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 30 0.3 A A mA A Pins 2 and 6 Symbol VS Value 18 Unit V
7. Electrical Characteristics
Tamb = 25 C; typical values under normal operation in application circuit Figure 2-1 on page 2, VS = 12V (pins 2 and 6); reference point ground (-31), unless otherwise specified. Parameters Supply voltage range Supply current, dark phase Supply current, stand-by 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 Bright period Bright period Frequency increase Control signal threshold 1 Control signal threshold 2 Lamp load Normal flashing, basic frequency f1 not including the tolerances of the external components R1 and C1 Basic frequency f1 VS = 9V to 15V Control frequency f2 VS = 9V to 15V Lamp failure, VS = 9V to 15V VS = 15V VS = 9V VS = 12V, Pin 7 First bright phase Test Conditions Pins 2 and 6 Pins 2 and 6 Pins 2 and 6 Pins 2 and 6 IO = 150 mA VS = 9V, pin 3 Pin 3 Symbol VS IS IS IS VO IO RL ton R1 C1 f1 f1 f2 f2 VR3 VR3 PL 1 -5 47 37 2.15 x f1 50 43 47 53 45 49 6.8 60 10 510 47 +5 53 45 2.3 x f1 57 47 51 15 7.0 Min. 9 4.5 Typ. Max. 16.5 8 10 11 1.0 0.1 Unit V mA A mA V mA ms k F % % % Hz mV mV W
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8. Ordering Information
Extended Type Number U6432B-MFPY U6432B-MFPG3Y Package SO8 SO8 Remarks Tubed, Pb-free Taped and reeled, Pb-free
9. Package Information
Package: SO 8 Dimensions in mm 4.90.1 50.2 3.70.1
0.2
0.1+0.15
1.4
0.4 1.27 3.81
3.80.1 60.2
8
5
technical drawings according to DIN specifications
1 Drawing-No.: 6.541-5031.01-4 Issue: 1; 15.08.06
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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. 4725C-AUTO-10/06 History * Put datasheet in a new template * Pb-free logo on page 1 deleted * Section 7 "Electrical Characteristics" on page 6 changed * * * * Put datasheet in a new template Updated text to new style guide First page: Pb-free logo added Page 6: Ordering Information changed
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4725C-AUTO-10/06

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