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U6432B Datasheet(PDF) 5 Page - ATMEL Corporation |
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U6432B Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 9 page 5 4725C–AUTO–10/06 U6432B 4.6.2 Control Signal Threshold 2 (15-mV Comparator) A voltage drop at the shunt resistor R 3 between 49 mV and 15 mV lets the flasher work in fre- quency doubling mode. If the voltage drop decreases to a value below V R3MAX = 15 mV, frequency doubling is disabled. This can be achieved either with a switch which bypasses the shunt resistor (for example, a spe- cial hazard warning switch) or with a small lamp load. Flasher operation starts with a lamp load of P L ≥ 1W. 4.7 Pin 8, Start Input Start condition for flashing: • Voltage at pin 8 (see Figure 2-1 on page 2) •V 8 ≤VS – (VBE(T1) + VZ(D2)) Condition for standby: The resistor R 2 between VS and pin 8 provides an extremely low standby current (IS ≤10 µA). The leakage current depends on the pull-up resistor R 2 according to the following formula: I Leak ≈ (V BE(T1) + VZ(D2))/R2 5. Application Hint In order to achieve a high-level immunity against “electrical interference by conduction and cou- pling” according to ISO/TR 7637/1 test level 4, an electrolytic capacitor C 2 =10 µF (25V) between pin 1 and 2 – mounted close to the IC – is highly recommended. |
Similar Part No. - U6432B_06 |
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Similar Description - U6432B_06 |
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