U2100B-MFP Datasheet, PDF (7/13 Pages) List of Unclassifed Manufacturers – Timer Control for Triac and Relay

U2100B
Tracking Time Pin 7
Trigger Inputs Pins 5
and 6
An internal RC oscillator with a following divider stage 1:2¹⁰ allows a very long and
reproducible tracking time.
The RC values for the required final time, t_t, can be calculated as follows:
R_t[Ω] = -₁---_.--₆----_×---^t--^s-₁--^[-^s-₀--^]-₂--^×-₄-----_×¹----⁰--_C-⁶---_t--_[--_µ---_F----_]
C_t[µF ]
=
------------^t--^s---^[--^s---^]---^×-----¹----⁰---⁶-------------
1.6 × 1024 × R_t[Ω]
t_t[s]
=
-^C----^t--^[-^µ----^F---^]----^×-----^R-----^t--^[--^Ω----^]----^×------¹---^.--⁶-----^×-----¹----⁰---²---⁴--
10⁶
Two AND-connected, identical inputs determine the trigger conditions of the monostable
time stages (Figure 8, Figure 9 on page 8), i.e., both inputs must be in position "ON" so
that the output is switched on. The tracking time starts after the trigger conditions have
elapsed. The output ON state is given until the tracking time has elapsed.
Input pin 5 is a simple comparator, whereas input pin 6 is designed as a window
discriminator.
The noise suppression for t_ON = 40 ms prevents peak noise signals at the inputs which
could trigger the circuit.
At the same time, the retrigger function is delayed for a duration of 640 ms (t_OFF) to
avoid noise signal that may trigger the relay.
Figure 8. Trigger Condition, Pin 5
V₅
0
T₁ = 0.5 V_Ref
T₂ = 0.65 V_Ref
V_Ref
OFF
Hysteresis
ON
7
4769B–INDCO–12/04