U6046B Datasheet, PDF (4/11 Pages) TEMIC Semiconductors – Rear Window Heating Timer

U6046B / U6047B
Relay Control Output Behavior, Pin 2
Time functions (relay output) can be started or interrupted
by the three inputs i.e., ON, OFF or TOGGLE (Pins 3, 4
and 5).
The relay becomes active if the time function is triggered,
and the relay contact is interrupted after the elapse of
delay time, t_d. There are two input possibilities:
Toggle Input, Figures 5 and 6
When the push-button (TOGGLE) switch, S₁, is pressed
for the first time, the relay becomes active after the
debounce time, t₃, i.e., the relay output, Pin 2, is active.
Renewed operation of S₁ causes the interruption of the
relay contact and the relay is disabled. Each operation of
the toggle switch, S₁, changes (alters) the condition of the
relay output when the debounce time, t₃, is exceeded i.e.,
the TOGGLE function.
If the relay output is not disabled by pressing the switch
S₁, the output is active until the delay time, t_d, is over.
ON, OFF Inputs, Pins 3 and 4,
Figures 7 and 8
To avoid simultaneous operation of both inputs, Pin 3
(ON) and Pin 4 (OFF), use of two-way contact with
centre-off position with spring returns (also known as
rocker-actuated switch) is recommended.
Pressing the push-button switch (Pin 3-ON) leads to the
activation of the relay after the debounce time, t₃,
whereas the switching of the Pin 4 switch correspond-
ingly leads to the relay being de-energized. If the relay is
not de-energized by the push-button switch, it becomes
disabled after the delay time, t_d, is over.
Combined operation, “TOGGLE and ON/OFF” is not
possible due to the fact that there is only one debouncing
circuit. Debouncing functions on both sides i.e., when-
ever S₁ is ON or OFF.
If Pin 3 (input ON) is continuously closed, the delay time,
t_d, still elapses and the relay is interrupted. This can be
used to generate a defined power-on-reset pulse to trigger,
for example, a delay time, t_d, when the battery voltage,
V_Batt, is applied.
W ^{Figure 10 shows the input circuit of U6046B. It has an}
integrated pull-down resistance (20 k ), RF capacitor
(15 pF) and Z-diode (7 V). It reacts to voltages greater
than 2 V. The external protective resistor has a value of
W 20 k and the push-button switch, S, is connected to the
battery as shown in the diagram.
Contact current, I, is calculated as follows:
+ _{+ W} + + I
V_Batt–V_Z
R( 20 k )
where V_Batt
12 V, V_Z
7V
+ [ _W I
(12–7) V
20 k
0.25 mA
W It can be increased by connecting a 5.6 k resistor from
the push-button switch to ground as shown in figure 18.
V_Batt
R_{1 510 W}
C₁
R₂
C₂
20 kW
47 mF/
16 V ₈
7
6
5
S3
20 kW
U6046B
1
2
3
4
94 8753
Figure 7. ON/OFF function U6046B
V_Batt
R₁ 510 W
C₂
C₁
R₂
47 mF/
16 V ₈
7
6
5
U6047B
1
2
3
4
2 kW
2 kW
S3
94 8754
Figure 8. ON/OFF function U6047B
4 (11)
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97