U243B-FP
Key Features
- 1 Rt Ct 1.5 (Hz) where f1 is the frequency in normal flashing operation (basic frequency)
- The control frequency f2 is typically 2.2 times the value of f1 and is the frequency in the case of lamp failure
- The bright periods for f1 and f2 are internally set in the IC and are 50% for f1 and 40% for f2
- The resistors R1 and R2 are needed to protect the circuit against possible damage
- An integrated Z-diode in addition to these external resistors limits the impulse current in the integrated circuit to ≤ 1.5 A
- Connecting the circuit with the wrong polarity leads to current limitation by R1, R2 and the resistance of the coil of the relay
- A current of about 150 mA would then flow over R1, so that for unlimited protection against continuous reve
