LSI Computer Systems LS7338
The LS7338 is a monolithic MOS integrated circuit designed to turn a triac On and Off in a Power Switch for Incandescent Lighting. The triac remains On for the duration of the Timer which is controlled by an external R-C connected to the OSCILLATOR input. When Time-out occurs, the power delivered by the triac is stepped down by 31% and then slowly reduced to Off over a fixed period of time.| Part No. | LS7338 |
|---|---|
| Datasheet | LS7338 Download |
| Manufacturer |  LSI Computer Systems |
| Description | DELAYED-OFF LIGHT SWITCH |
| Buy | Stock & Price |
FEATURES
:● Phase-Lock Loop Synchronization allows use in Wall Switch
APPLICATIONS
.● Operation automatically sequences from Timed-On to Delayed-Off to Off.
● On-Timer programmable with external R-C.
● Transition from Timed-On to Delayed Off indicated by 31% drop in Delivered Power.
● Delayed-Off period denoted by Dim-to-Off operation. (See Note 1)
● Control input initiates Operating Sequence and can override Automatic Sequencing.
● 50/60Hz Line Frequency.
● +12V to +18V Operation (VSS - VDD).
● LS7338 (DIP); LS7338-S (SOIC) - See Figure 1 NOTE 1: Dim-to-Off time is Mask Programmable. The standard IC is fixed at 209 seconds for 60Hz. Dim-to-Off time can be programmed within a range of 6.5 to 836 seconds.
APPLICATIONS
:● WALL SWITCH for incandescent lighting in garage, corridor, staircase, child’s bedroom, teenage study area.
● IN-LINE SWITCH for table lamps.
DESCRIPTION
: Activation of SENSE or SLAVE inputs turns the triac On and starts a timer. In a typical application (Figure 5), the output of the LS7338 drives the gate of a triac in series with the load.
