U6044B Datasheet, PDF (1/7 Pages) TEMIC Semiconductors – Radiator fan controlled timer

TELEFUNKEN Semiconductors
Radiator fan controlled timer
U 6044 B
Description
The bipolar integrated circuit, U 6044 B, 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
cool-off process. In addition, an air-conditioning contact
can switch on the radiator fan at any time.
Features
D Delay time range: 4 s to 20 h
D Cool-off time starts when thermal switch is closed
D RC oscillator determines switching characteristics
D Relay driver with Z-diode
D Debounced input for coolant temperature switch
D Not debounced input for ignition key (Terminal 15)
D Low standby current
D Load dump protection
D RF interference protected
D Protection according to ISO/TR 7637-1 (VDE 0839)
Cases:
DIP 8, SO 8
C₂
OSC 6
R₂
10 mF
C_{1 R1}
510 W
x
V_stab 7
V_{S 8}
V_Batt
Oscillator
Stabilization
Power-on reset
Load dump detection
1
GND
Frequency divider
Debouncing
Monoflop
Logic
Relay control ²
output
Thermal switch
W^R4
300 k
4 Air condition 5
W^R5
300 k
Ignition 3
C₄
C₃
100 nF
1 kRW⁶
1 kW ^R7
100 nF
R₃ 20 kW
94 9232
Terminal 15
x
Figure 1 Block diagram with external circuit
Rev. A1: 12.12.1994
1