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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 1 W Low Susceptibility to EMI Extremely Low Standby Current of 10 A Protection According to ISO/TR 7637/1 Level 4 with External Capacitor (C2)
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-mW Shunt U6432B
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1
Block Diagram
Figure 1. Car Flasher Application
VS
6
G5
2
K3
+ -
V S-57 mV
VS
D1 21 V T1 C2 10 F
G3 C1 4.7 F
K2
+ 6.2 V D2
+ R1 82 kW G4 5 4 -
K1
V S-57 mV
G2
G1
T2 V S-6 V
49 a 3 Shunt VS R3 18 mW R4 5.1 kW R6 470 W 7 8 1
R2 1.2 kW
PL >1 W
2
U6432B
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U6432B
Pin Configuration
Figure 2. Pinning
GND VS REL 1 2 8 7 SI LD
U6432B
3 4 6 5 VS OSC
OSC
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 Relay driver Oscillator Oscillator Supply voltage Lamp failure detection Start input (49a)
3
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Functional Description
Pin 1, GND
The U6432B 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. 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. 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 W. The flashing frequency, f1, is determined by the R1C1 components as given by the formula below (see Figure 1):
1 f 1 ---------------------------------- Hz R 1 C 1 1.5
Pin 2, Supply Voltage, VS power Pin 3, Relay Control Output (Driver) Pin 4 and 5, Oscillator
where C1 47 F, R1 = 6.8 kW to 510 kW In 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 Pin 7
Control Signal Threshold (49 mV Comparator)
For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt to Pin 6 is recommended.
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. 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 by-passes the shunt resistor (e.g., a special hazard warning switch) or with a small lamp load. Flasher operation starts with a lamp load of PL 1 W.
Control Signal Threshold 2 (15-mV Comparator)
4
U6432B
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U6432B
Pin 8, Start Input
Start condition for flashing: * * Voltage at Pin 8 (see Figure 1) V8 VS - (VBE(T1) + VZ(D2)) The resistor R2 betwen V S and Pin 8 provides an extremly 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
Condition for standby:
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 electrolythic capacitor C 2 = 10 F (25 V) between Pin 1 and 2 - mounted close to the IC - is highly recommended.
Absolute Maximum Ratings
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 +105 -55 to +150 mW mW mW mW C C C Pin 2 and 6 Pin 2 and 6 Pin 8 Pin 3 IFSM IFSM IFSM IO 1.5 1.0 30 0.3 A A mA A Pin 2 and 6 Symbol VS Value 18 Unit V
5
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Electrical Characteristics
Tamb = 25C; typical values under normal operation in application circuit Figure 1, VS = 12 V (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 Normal flashing, basic frequency f1 not including the tolerances of the external components R1 and C1 Basic frequency f1 VS = 9 to 15 V Control frequency f2 VS = 9 to 15 V Lamp failure, VS = 9 to 15 V VS = 15 V VS = 9 V VS = 12 V, Pin 7 First bright phase Test Conditions Pin 2 and 6 Pins 2 and 6 Pins 2 and 6 Pins 2 and 6 IO = 150 mA VS = 9 V, Pin 3 Pin 3 Symbol VS IS IS IS VO IO RL ton R1 C1 Df1 Df1 Df2 f2 VR3 VR3 PL 1 -5 6.8 60 10 510 47 +5 7.0 Min. 9 4.5 Typ. Max. 16.5 8 10 11 1.0 0.1 Unit V mA mA mA V mA W ms kW F %
Bright period Bright period Frequency increase Control signal threshold 1 Control signal threshold 2 Lamp load
47 37 2.15 f1 50 43 47 53 45 49
53 45 2.3 f1 57 47 51 15
% % Hz mV mV W
6
U6432B
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U6432B
Ordering Information
Extended Type Number U6432B U6432B-FP Package DIP8 SO8 Remarks - -
Package Information
DIP8
7
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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
8
U6432B
4725A-AUTO-06/03
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4725A-AUTO-06/03 xM
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