U2102B Datasheet, PDF (7/16 Pages) TEMIC Semiconductors – Multifunction Timer

U2102B
Programing, Pin 6
Three operating modes can be programed with the tristate
input Pin 6:
D Zero-voltage switch (ZVS)with static output
(V₆ = V₁ = V_Ref):
The reverse phase control is inactive here. The output
stage is statically switched-on after triggering by the
timer and switched-off again after the running down
of the time (at the zero crossing of the supply voltage
in each case). This operating mode is not possible in
two–wire systems.
D Two-stage reverse phase control with switch-off
( V₆ = V₁₅ = V_S):
The maximum current flow angle, a_max, is set when
the timer has enabled the output stage. Switchover to
the phase angle a, which can be set arbitrarily at Pin 4,
takes place after expiry of 3/4 of the tracking time set
at Pin 5. The output stage switches off after expiry of
the whole tracking time.
D Two-stage reverse phase control ( V₆ = V_{13 =} GND):
This threshold is approximately 2 V in switched-off
condition and also during the second current flow angle,
aain two-stage reverse phase control mode. Otherwise,
the blocking-or switch-off threshold is 0.5 V.
The input Pin 8 is designed as a window discriminator, its
window is set at Pin 9. The minimum window of approxi-
mately 250 mV is set with V₉ = V₁₃, and the maximum
window of approximately 1.25 V with V₉ = V_l. The
window discriminator is in the OFF state when the
voltage at Pin 8 lies within the window set at Pin 9.
If a resistor divider with an NTC resistor is connected to
Pin 9, for example, it is possible to compensate for the
temperature dependence of the IR sensor, i.e. the range is
made independent of temperature.
Noise suppression for t_ON = 40 ms guarantees that there
is no peak noise signals at the inputs which could trigger
the circuit. Equally, renewed triggering is prevented for
t_OFF = 640 ms after load switch-off in order to avoid any
self interference.
The output stage switches to the maximum current
flow angle, a_max, (adjustable) if the trigger condition
for both inputs (Pins 7, 8) is satisfied. Switchover to
the current flow angle, a, set at Pin 4 takes place after
expiry of 3/4 of the tracking time set at Pin 5. The
whole process is repeated from the beginning again if
renewed triggering takes place at Pin 8. The lamp is
switched-off in the following half-wave of the mains
voltage if the trigger condition at Pin 7 disappears. In
this mode, the output stage is switched-on even if only
Pin 7 is in the ON state. The current flow angle is then
determined by V₄ (e.g., house no. illumination,
twilight switch).
V₇
V_Ref
0.5 V_Ref
0.1/0.4 V_Ref
0
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ON
Hysteresis
OFF
Figure 7. Trigger condition Pin 7
Trigger Inputs, Pins 7 and 8
The trigger condition of the timer is determined by the
two inputs Pins 7 and 8. A Light Dependent Resistor
( LDR) can be connected to Pin 7, for example, and an IR
sensor to Pin 8. Both inputs must be in the ON state to
initiate triggering, since they are equal and AND-gated.
In the operating mode “2-stage reverse phase control”,
the output stage can additionally be switched-on and
switched-off by Pin 7 alone and independently of the
timer.
The enable input Pin 7 is implemented as a comparator
with hysteresis. The enable threshold is approximately
2.5 V. The blocking threshold is switched by the control
logic in order to avoid faults as a result of load switching.
V₈
V_Ref
0.5 V_Ref
0
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ON
0.05 V_Ref + 0.2 V₉
OFF
0.05 V_Ref + 0.2 V₉
ON
Figure 8. Trigger condition Pin 8
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
7 (16)