U2102B Datasheet, PDF (10/19 Pages) TEMIC Semiconductors – Multifunction Timer

Figure 8-1. Trigger Condition Pin 7
V₇
V_Ref
0.5 × V_Ref
0.1/0.4 × V_Ref
0
ON
Hysteresis
OFF
Figure 8-2. Trigger Condition Pin 8
V₈
V_Ref
ON
0.5 × V_Ref
0
0.05 × V_Ref + 0.2 × V₉
OFF
0.05 × V_Ref + 0.2 × V₉
ON
9. RC Oscillator
An internal RC oscillator with following divider stage 1:2¹¹ permits a very long and reproducible
tracking time.
The RC values for a certain tracking time, t_t, are calculated as follows:
R₂(kΩ)
=
----------------^t--^t-⁽--^s---⁾--¹----⁰---³----------------
1.4 × 2048 C₂ (µF)
C₂(µF)
=
----------------^t--^t--⁽--^s---⁾--¹---⁰----³----------------
1.4 × 2048 R₂ (kΩ)
In reverse phase control mode, switchover from maximum current flow angle to the value set at
pin 4 takes place after expiry of 3/4 of the total tracking time t_t.
10 U2102B
4767B–INDCO–10/05