U6049B Datasheet, PDF (4/8 Pages) TEMIC Semiconductors – Radiator Fan Controlled Timer

U6049B
V_Batt
Ignition
S_th
closed
open
Pin 3
Pin 4
Delay time
(internal)
Relay
Pin 5=V_stab:
Relay
Pin 5 = GND:
Pin 5 = Programming Pin
Pin 2
Pin 2
94 8817
S = t_d
t_d is stopped, if S_th is open
Figure 7. Timing waveform
The programming input (Pin 5) is high-ohmic and should
therefore be connected to Pin 7 (V_stab) or GND. The relay
control output is shown according to Pin 5 connection.
Thermal switch input, Pin 4, is debounced (see figure 1).
Relay control output, Pin 2, is disabled when the battery
voltage, V_Batt, is applied. Relay control output follows the
conditions of the switch, S_th, only when the ignition is
switched-ON. This is possible only after the debounce
time, t_3. In this case Pin 5 is connected to Pin 7.
Timing waveforms are shown in figure 4. Total delay
time, t_d, is the sum of all ON-pulses caused by the thermo-
static switching. This can run down at once or in parts. If
S_th (Pin 4) is open, the oscillator is stopped (switched-off)
internally, but when it starts (S_th closed), the delay time,
t_d, starts running again. In case of renewed switching of
ignition, the counter of the delay time is reset.
V_Batt
510 W
R₁
200 kW 100 nF
R₂
C₂
8
7
6
5
C₁
47 mF
U6049B
R₅
94 8812
1
2
3
4
C₃
R₄
100 nF
20 kW R₃
Terminal 15
Figure 8. R₄ = 2 kW to 200 kW
Basic circuit
2 kW
S_th
Thermal
switch
4 (8)
TELEFUNKEN Semiconductors
Rev. A3, 04-Feb-97