5

4725C–AUTO–10/06

U6432B

4.6.2

Control Signal Threshold 2 (15-mV Comparator)

A voltage drop at the shunt resistor R

quency doubling mode.

If the voltage drop decreases to a value below V

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

4.7

Pin 8, Start Input

Start condition for flashing:

• Voltage at pin 8 (see Figure 2-1 on page 2)

•V

Condition for standby:

The resistor R

The leakage current depends on the pull-up resistor R

I

(V

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

between pin 1 and 2 – mounted close to the IC – is highly recommended.