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Электронный компонент: U6046B-FP

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U6046B / U6047B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
1 (11)
Rear Window Heating Timer
Description
The window heating timers are bipolar integrated
circuits. Due to time controlled functions, they reduce the
current consumptions of high loads i.e., heating resistors.
An ON-relay can be switched off after a preset delay time.
The relay time can be interrupted manually, whereas a
retrigger function is not provided.
Features
D Delay time range: 3.7 s to 20 h
D RC oscillator determines switching characteristics
D Relay driver with Z-diode
D Debounced input for toggle switch
D Two debounced inputs: ON and OFF
D Load-dump protection
D RF interference protected
D Protection according to ISO/TR7637-1 (VDE 0839)
D U6046B: Inputs switched to V
Batt
D U6047B: Inputs switched to ground
Ordering Information
Extended Type Number
Package
Remarks
U6046B, U6047B
DIP8
U6046BFP, U6047BFP
SO8
Block Diagram
Stabilization
Power-on reset
Load-dump detection
Debouncing
Monoflop
Relay control
output
Oscillator
Frequency divider
ON
OFF
TOGGLE
GND
OSC
V
S
V
stab
94 8747
6
7
8
3
4
5
1
2
R
2
C
2
R
1
C
1
510
W
47
mF
V
Batt
Figure 1. Block diagram with external circuit
U6046B / U6047B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
2 (11)
Pin Configuration
Pin
Symbol
Function
1
GND
Reference point, ground
2
RELAY
Relay control output
3
ON
Switch-on input
4
OFF
Switch-off input
5
TOGGLE
Toggle input
6
OSC
RC oscillator input
7
V
stab
Stabilized voltage
8
V
S
Supply voltage
1
2
3
4
8
7
6
5
GND
RELAY
ON
OFF
TOGGLE
OSC
V
stab
V
S
94 8844
Figure 2. Pinning
Functional Description
Power Supply, Pin 8
For reasons of interference protection and surge immu-
nity, the supply voltage (Pin 8) must be provided with an
RC circuit as shown in figure 3. Dropper resistor, R
1
,
limits the current in case of overvoltage, whereas C
1
smoothes the supply voltage at Pin 8.
Recommended values are: R
1
= 510
W, C
1
= 47
mF.
The integrated Z-diode (14 V) protects the supply volt-
age,V
S
. Therefore, the operation of the IC is possible
between 6 V and 16 V, supplied by V
Batt
.
However, it is possible to operate the integrated circuit
with a 5 V supply, but it should be free of interference
voltages. In this case, Pin 7 is connected to Pin 8 as shown
in figure 4, and the R
1
C
1
circuit is omitted.
47
mF/
16 V
C
1
R
1
510
W
R
2
C
2
V
Batt
1
2
6
5
8
7
3
4
94 8749
U6046B
U6047B
Figure 3.
Basic circuit for 12 V supply and oscillator
R
2
C
2
V
Batt
1
2
6
5
8
7
3
4
94 8750
V
S
= 5 V
U6046B
U6047B
Figure 4.
Basic circuit for V
S
= 5 V
U6046B / U6047B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
3 (11)
Oscillator, Pin 6
Oscillator frequency, f, is determined mainly by the
R
2
C
2
circuit. Resistance, R
2
, determines the charge time,
and the integrated resistance (2 k
W) is responsible for dis-
charge time. For the stability of the oscillator frequency,
it is recommended that the selected R
2
value be much
greater than the internal resistance (2 k
W) because the
temperature response and the tolerances of the integrated
resistance are considerably greater than the external
resistance value.
Oscillator frequency, f, is calculated as follows:
f
+
1
t
1
) t
2
where
t
1
= charge time =
a
1
R
2
C
2
t
2
= discharge time =
a
2
2 kW C
2
a
1
and
a
2
are constants as such
a
1
= 0.833 and
a
2
= 1.551 when C
2
= 470 pF to 10 nF
a
1
= 0.746 and
a
2
= 1.284 when C
2
= 10 nF to 4700 nF
The debounce time, t
3
, and the delay time, t
d
, depend on
the oscillator frequency, f, as follows:
t
3
+ 6 1
f
t
d
+ 73728 1
f
Table 1 shows relationships between t
3
, t
d
, C
2
, R
2
and
frequencies from 1 Hz to 20 kHz.
Relay Control Output
The relay control output is an open collector Darlington
circuit with an integrated 23-V Z-diode for limitation of
the inductive cut-off pulse of the relay coil. The
maximum static collector current must not exceed 300
mA and saturation voltage is typically 1.1 V @ 200 mA.
Interference Voltages and Load-Dump
The lC supply is protected by R
1
, C
1
, and an integrated
Z-diode, while the inputs are protected by a series resistor,
integrated Z-diode and RF capacitor (refer to Figures 10
and 11).
The relay control output is protected via the integrated
23-V Z-diode in the case of short interference peaks. It is
switched to conductive condition for a battery voltage of
greater than approx. 40 V in the case of load-dump. The
output transistor is dimensioned so that it can withstand
the current produced.
Power-on Reset
When the operating voltage is switched on, an internal
power-on reset pulse (POR) is generated which sets the
logic of the circuits to a defined initial condition. The
relay output is disabled.
47
mF/
16 V
C
1
510
W
R
2
C
2
V
Batt
1
2
6
5
8
7
3
4
94 8751
20 k
W
S1
U6046B
R
1
Figure 5.
TOGGLE function U6046B
47
mF/
16 V
C
1
R
1
510
W
R
2
C
2
V
Batt
1
2
6
5
8
7
3
4
94 8752
2 k
W
S1
U6047B
Figure 6.
TOGGLE function U6047B
U6046B / U6047B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
4 (11)
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, S
1
, is pressed
for the first time, the relay becomes active after the
debounce time, t
3
, i.e., the relay output, Pin 2, is active.
Renewed operation of S
1
causes the interruption of the
relay contact and the relay is disabled. Each operation of
the toggle switch, S
1
, changes (alters) the condition of the
relay output when the debounce time, t
3
, is exceeded i.e.,
the TOGGLE function.
If the relay output is not disabled by pressing the switch
S
1
, 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, t
3
,
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 S
1
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.
Figure 10 shows the input circuit of U6046B. It has an
integrated pull-down resistance (20 k
W), 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
20 k
W and the push-button switch, S, is connected to the
battery as shown in the diagram.
Contact current, I, is calculated as follows:
I
+
V
Batt
V
Z
R(
+ 20 kW)
where V
Batt
+ 12 V, V
Z
+ 7 V
I
+
(127) V
20 k
W
[ 0.25 mA
It can be increased by connecting a 5.6 k
W resistor from
the push-button switch to ground as shown in figure 18.
47
mF/
16 V
C
1
R
1
510
W
R
2
C
2
V
Batt
1
2
6
5
8
7
3
4
94 8753
20 k
W
20 k
W
S3
U6046B
Figure 7.
ON/OFF function U6046B
47
mF/
16 V
C
1
R
1
510
W
R
2
C
2
V
Batt
1
2
6
5
8
7
3
4
94 8754
2 k
W
2 k
W
S3
U6047B
Figure 8.
ON/OFF function U6047B
U6046B / U6047B
TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
5 (11)
Figure 11 shows the input circuit of U6047B. It has an
integrated pull-up resistance (100 k
W), RF capacitor
(15 PF) and Z-diode (7 V). The circuit reacts to voltages
less than 2 V. The external protective resistance has a
value of 2 k
W and the push-button switch is connected to
GND. Contact current, I, is calculated as follows:
I
[
V
S
(100 k
W ) 2 kW)
when V
Batt
+ 12 V
I
[ 0.1 mA
It can be increased by connecting a 5.6 k
W resistor from
the push-button-switch to V
Batt
as shown in figure 19.
The connecting diodes prevent the current flow to the
input of the Z-diodes when the rocker actuated-switch is
in open-state (current-consumption only in
standby-mode). If necessary, these diodes can be omitted.
Timing Waveform
t
3
Diagram 5A
Diagram 5B
Diagram 5C
Toggle
Relay
ON
OFF
Relay
ON
OFF
Relay
Pin 5
Pin 2
Pin 3
Pin 4
Pin 3
Pin 4
Pin 2
94 8755
Pin 2
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
3
t
d
t
d
t
d
t
3
Figure 9. Behavior of the relay control output as a function of input condition
7 V
15 pF
20 k
W
+
2 V
Pin 3,4,5
20 k
W
VBatt
94 8756
S
R
Figure 10. Input circuit U6046B
7 V
15 pF
100 k
W
+
2 V
Pin 3,4,5
2 k
W
94 8757
V
S
Figure 11. Input circuit U6047B