U2100B Datasheet, PDF (4/9 Pages) TEMIC Semiconductors – Timer Control for Triac and Relay

U2100B
Tracking Time Pin 7
An internal RC oscillator with following divider stage
1:2¹⁰ allows a very long and reproducible tracking time.
RC-values for required final time, t_t, can be calculated as
follows:
W + _m R_t [ ]
t _t [s] 10⁶
1.6 1024 C_t[ F]
m + _W C_t [ F]
t_t[s] 10⁶
1.6 1024 R_t[ ]
+ ^{m W} t_t [s]
C_t [ F]
R_t [ ] 1.6
10⁶
1024
Trigger Inputs Pins 5 and 6, Figures 7 and 8
Two AND-connected, identical inputs determine the
trigger conditions of monostable time stages, i.e., both
inputs must be in position “ON” so that the output is
switched ON. The tracking time starts after the trigger
conditions has elapsed. The output ON state is given until
the tracking time is over.
Input Pin 5 is a simple comparator whereas input Pin 6 is
built up as a window discriminator.
Noise suppression for t_ON = 40 ms guarantee, that there
is no peak noise signals at the inputs which could trigger
the circuit.
At the same time, the retrigger is delayed for a duration
of 640 ms (t_OFF), to avoid noise signal to trigger the relay.
V₅
0
T₁ = 0.5 V_Ref
T₂ = 0.6 V_Ref
V_Ref
OFF
Hysteresis
ON
Figure 7. Trigger condition, Pin 5
V₆
0
ON
+ T₁ 0.5 V_Ref
+ T₂ 0.65 V_Ref
OFF
ON
V_Ref
Figure 8. Trigger condition, Pin 6
95 9954
95 995
4 (9)
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96