D340B Datasheet, PDF (8/9 Pages) List of Unclassifed Manufacturers – Electroluminescent Lamp Driver IC

V. Automatic Turn-Off After Long Time Delay
Longer on-times can be achieved with the addition of an external transistor. Typically, a mechanical switch
pulls E’ low to initially turn on the device. When the switch is released, Cdelay keeps the D340B operating
for a period before turning off. The following table shows typical delay on-times using the following circuit
with smaller capacitor values.
C delay (uF)
1
2
3
Vbat
1.5V
8 sec
16 sec
25 sec
3.0V
11 sec
21 sec
31 sec
8