TELEFUNKEN Semiconductors
U 6044 B
Radiator fan controlled timer
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
D
D
D
D
Delay time range: 4 s to 20 h
Cool-off time starts when thermal switch is closed
RC oscillator determines switching characteristics
Relay driver with Z-diode
Debounced input for coolant temperature switch
DIP 8, SO 8
C
2
10
m
F
V
stab
7
V
S
8
C
1
R
1
510
W
x
V
Batt
D
D
D
D
D
Not debounced input for ignition key (Terminal 15)
Low standby current
Load dump protection
RF interference protected
Protection according to ISO/TR 7637-1 (VDE 0839)
Cases:
R
2
OSC 6
Oscillator
Stabilization
Power-on reset
Load dump detection
1
GND
Frequency divider
Debouncing
Monoflop
Logic
Relay control
output
2
Thermal switch
R
4
300 k
W
R
6
1 k
W
4 Air condition 5
R
5
300 k
W
1 k
W
R
7
Ignition 3
C
4
100 nF
C
3
100 nF
94 9232
R
3
20 k
W
Terminal 15
x
Figure 1 Block diagram with external circuit
Rev. A1: 12.12.1994
1
TEMIC [ TEMIC SEMICONDUCTORS ]
