Description

The bipolar integrated circuit, U6049B, is designed as a radiator fan controlled timer. After the ignition is switched off, the thermal switch of the engine can activate the radiator fan via relay for a preset period to support the cooling process.

Features

• Delay time range: 3.7 s to 20 h

• Cooling time starts when thermal switch is closed

• RC-oscillator determines switching characteristics

• Relay driver with Z-diode

• Debounced input for coolant temperature switch

• Not debounced input for ignition key (Terminal 15)

• Load-dump protection

• RF interference protected

• Protection according to ISO/TR 7637-1 (VDE 0839)