HT7612

Rev. 1.20

7

February 9, 2010

Effective Trigger Timing

The effective input trigger signal width should be

³ 24ms. The output is valid either with (1) trigger signal width ³ 0.5

seconds or (2) more than 2 effective trigger inputs within 2 seconds (separation of 2 triggers

³ 0.5s). And the separation

time between two TRIAC(RELAY) turn-on time must be more than 1 sec. The trigger timing is shown as Fig.11.

Retrigger

When the output of comparator is a valid signal, the RELAY/TRIAC will be activated and the active duration is con-

trolled by the DT oscillating period. If the previous

curs again, the active duration of RELAY/TRIAC will be restarted to count. The timing is shown as Fig.12.

Fig.12 Retrigger

Fig.11 Trigger Timing