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U6432B Datasheet(PDF) 4 Page - ATMEL Corporation |
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U6432B Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 9 page 4 4725C–AUTO–10/06 U6432B 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 R 2 and R4 limits the current pulses in the IC. 4.2 Pin 2, Supply Voltage, V S 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 V S 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 Ω. 4.4 Pins 4 and 5, Oscillator The flashing frequency, f 1, is determined by the R1C1 components as given by the formula below (see Figure 2-1 on page 2): where C 1 ≤47 µF, R1 = 6.8 kΩ to 510 kΩ In case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage fre- quency f 2 with f2 ≈ 2.2 × f 1. 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 V S/shunt to pin 6 is recommended. 4.6 Pin 7 4.6.1 Control Signal Threshold (49-mV Comparator) The detection point for lamp failure can be calculated from the control signal threshold, typically 49 mV with V S = 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. f 1 1 R 1 C 1 × 1.5 × -------------------------------------Hz ≈ |
Similar Part No. - U6432B_06 |
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Similar Description - U6432B_06 |
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