U6046B-FP TEMIC Semiconductors, U6046B-FP Datasheet - Page 3

• Manufacturer Part Number: U6046B-FP
• Description: Rear Window Heating Timer
• Manufacturer: TEMIC Semiconductors

TELEFUNKEN Semiconductors
Rev. A2, 03-Feb-97
Oscillator, Pin 6
Oscillator frequency, f, is determined mainly by the
R
and the integrated resistance (2 k
charge time. For the stability of the oscillator frequency,
it is recommended that the selected R
greater than the internal resistance (2 k
temperature response and the tolerances of the integrated
resistance are considerably greater than the external
resistance value.
Oscillator frequency, f, is calculated as follows:
where
t
t
a
a
a
The debounce time, t
the oscillator frequency, f, as follows:
Table 1 shows relationships between t
frequencies from 1 Hz to 20 kHz.
1
2
1
1
1
2
V
= charge time =
= discharge time =
C
= 0.746 and
Batt
and
= 0.833 and
2
circuit. Resistance, R
a
f
t
t
2
3
d
+
Figure 5.
are constants as such
+
+
t
1
6
73728
47
16 V
)
a
a
1
C
2
m
2
1
F/
t
= 1.284 when C
a
= 1.551 when C
R
2
TOGGLE function U6046B
1
1
f
1
3
a
8
1
, and the delay time, t
2
R
510
1
f
2
2 k
2
W
, determines the charge time,
C
U6046B
W
7
2
2
W
R
C
) is responsible for dis-
2
2
2
C
2
= 10 nF to 4700 nF
2
= 470 pF to 10 nF
6
3
3
2
, t
W
value be much
d
) because the
, C
d
, depend on
5
4
2
S1
, R
20 k
2
W
94 8751
and
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
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.
V
Batt
Figure 6.
U6046B / U6047B
47
16 V
C
m
1
TOGGLE function U6047B
F/
R
1
8
1
510
W
U6047B
2
7
1
, C
R
2
C
1
2
, and an integrated
6
3
5
4
94 8752
S1
2 k
3 (11)
W