LS7231, LS7231-S, LS7232 Selling Leads, Datasheet
MFG:DIP-8P Package Cooled:LSI D/C:03+
LS7231, LS7231-S, LS7232 Datasheet download
Part Number: LS7231
MFG: DIP-8P
Package Cooled: LSI
D/C: 03+
LS7231, LS7231-S, LS7232
- Table of contents:
Info of LS7231
Info of LS7231-S
Info of LS7232
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About LS7231
PDF/DataSheet Download
Datasheet: LS7231
File Size: 72137 KB
Manufacturer: LSI [LSI Computer Systems]
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About LS7030
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Datasheet: LS7030
File Size: 68055 KB
Manufacturer: LSI [LSI Computer Systems]
Download : Click here to Download
About LS7232ND
PDF/DataSheet Download
Datasheet: LS7232ND
File Size: 49995 KB
Manufacturer: LSI [LSI Computer Systems]
Download : Click here to Download
LS7231 General Description
LS7231 through LS7234 are a series of monolithic, MOS integrated circuits designed for the control of brightness of incandescent lamps. The outputs of these ICs control the brightness of a lamp by controlling the firing angle of a triac connected in series with the lamp. All internal timings are synchronized with the line frequency by means of a built-in phase-lock loop circuit. The output occurs once every half-cycle of the line frequency. Within the halfcycle, the output can be positioned anywhere between 158°conduction angle for maximum brightness and 41° conduction angle for minimum brightness in relation to the AC line frequency. The positioning of the output is controlled by applying a low level at the SENS input or a high level at the EXT input.
These functions may be implemented with very few interface components, as shown in Figure 5. When implemented in this manner, touching of the Touch Plate causes the lamp brightness to change as follows:
1. If the Touch Plate is touched momentarily (42ms to 333ms), the lamp is:
a) turned off if it was on,
b) turned on if it was off.
The brightness resulting is either full brightness or depending on the circuit type, a previous brightness stored in the IC memory.
2. If the Touch Plate is touched for a prolonged time (more than 342ms) the light intensity changes slowly. As long as the touch is maintained, the change continues; the direction of change reverses whenever the maximum or minimum brightness is reached.
The IC also provides an input for slow dimming. By applying a slow clock to this input, the lamp can be dimmed slowly until total turn off occurs. This feature can be useful at bedtime in a child's room.
LS7231 Maximum Ratings
| PARAMETER |
SYMBOL |
VALUE |
UNITS |
| DC Supply Voltage |
VSS |
+20 |
V |
| Voltage at any input |
VIN |
VSS -20 to VSS + 0.5 |
V |
| Operating temperature |
TA |
0 to +80 |
°C |
| Storage temperature |
TSTG |
-65 to +150 |
°C |
LS7231 Features
• Phase-lock loop synchronization allows use in Wall Switch applications.
• Provides brightness control of incandescent lamps with touch plates or mechanical switches.
• Controls the "duty cycle" from 23% to 88% (conduction angles for AC half-cycles between 41° and 158°, respectively.)
• Operates at 50Hz/60Hz line frequency.
• Extension input for remote activation.
• Input for slow dimming.
• +12V to +18V DC Power Supply voltage. (VSS - VDD)
• LS7231 to LS7234 (DIP) - See Figure 1 LS7231-S to LS7234-S (SOIC)
• Provides brightness control of incandescent lamps with touch plates or mechanical switches.
• Controls the "duty cycle" from 23% to 88% (conduction angles for AC half-cycles between 41° and 158°, respectively.)
• Operates at 50Hz/60Hz line frequency.
• Extension input for remote activation.
• Input for slow dimming.
• +12V to +18V DC Power Supply voltage. (VSS - VDD)
• LS7231 to LS7234 (DIP) - See Figure 1 LS7231-S to LS7234-S (SOIC)
LS7231 Connection Diagram
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