LS7631, LS7631-S, LS7632 Selling Leads, Datasheet
MFG:LSI Package Cooled:DIP D/C:02+;03+
LS7631, LS7631-S, LS7632 Datasheet download
Part Number: LS7631
MFG: LSI
Package Cooled: DIP
D/C: 02+;03+
LS7631, LS7631-S, LS7632
- Table of contents:
Info of LS7631
Info of LS7631-S
Info of LS7632
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About LS7631
PDF/DataSheet Download
Datasheet: LS7631
File Size: 45766 KB
Manufacturer: LSI [LSI Computer Systems]
Download : Click here to Download
About LS7030
PDF/DataSheet Download
Datasheet: LS7030
File Size: 68055 KB
Manufacturer: LSI [LSI Computer Systems]
Download : Click here to Download
About LS7632
PDF/DataSheet Download
Datasheet: LS7632
File Size: 45766 KB
Manufacturer: LSI [LSI Computer Systems]
Download : Click here to Download
LS7631 General Description
A typical electronic dimmer may not operate properly with the inductive load encountered when driving a transformer-coupled low-voltage halogen lamp. The inductive load can cause a phenomenon called half-waving, wherein the triac fires in alternate half-cycles only, which may lead to the thermal destruction of the load transformer. The problems encountered in driving an inductive load are addressed by the LS7631/LS7632 CMOS ICs as follows:
1. Compensation for delayed triac cut-off. When a trigger pulse is due to occur at a conduction angle which coincides with the on-state of the triac, the trigger pulse is delayed until the triac has turned off. This eliminates the underlying cause of half-waving.
.
2. Compensation for delayed triac turn-on. At the set conduction angle, a triac trigger pulse of 130.2s (60 Hz) is issued by the IC. If the triac fails to fire, a second trigger pulse of 260.4s width is issued 1ms later as a second attempt to fire the triac during the same half-cycle.
3. Safety-shutdown.
If the frequency of occurrences of the delayed cut-off and delayed turn-on exceeds a preset threshold, a shutdown is initiated by turning off the triac trigger pulses. The safetyshutdown threshold value is accumulated in a 4-bit Up/Down counter. The count increments for every occurrence of delayed cut-off or delayed turn-on and decrements once every 8 SYNC pulses (AC line cycles). The counter will not decrement below zero. If the count reaches 15, the safetyshut- down is effected.
LS7631 Maximum Ratings
| PARAMETER |
SYMBOL |
VALUE |
UNITS |
| DC Supply Voltage |
VDD - VSS |
7.0 |
V |
| Voltage at any input |
VIN |
VSS - .3 to VDD + .3 |
V |
| Operating temperature |
TA |
0 to +90 |
°C |
| Storage temperature |
TSTG |
-65 to +150 |
°C |
LS7631 Features
• Touch or pushbutton control of incandescent lamps and transformer-coupled halogen lamps
• Transformer can be Magnetic or Electronic
• Direct replacement for P/N SLB 0587
• Automatic safety shutdown
• PLL synchronization allows use as a Wall Switch
• Three operating modes
• Extension input for remote activation
• 50Hz/60Hz AC line frequency
• +5V Power Supply (VDD - VSS)
• LS7631, LS7632 (DIP); LS7631-S, LS7632-S (SOIC)
• Transformer can be Magnetic or Electronic
• Direct replacement for P/N SLB 0587
• Automatic safety shutdown
• PLL synchronization allows use as a Wall Switch
• Three operating modes
• Extension input for remote activation
• 50Hz/60Hz AC line frequency
• +5V Power Supply (VDD - VSS)
• LS7631, LS7632 (DIP); LS7631-S, LS7632-S (SOIC)
LS7631 Typical Application
Electronic dimmers for wall switch control of ceiling mounted lighting, foot switch control of large floor lamps and hand switch control of table lamps.
LS7631 Connection Diagram
LS7632 General Description
A typical electronic dimmer may not operate properly with the inductive load encountered when driving a transformer-coupled low-voltage halogen lamp. The inductive load can cause a phenomenon called half-waving, wherein the triac fires in alternate half-cycles only, which may lead to the thermal destruction of the load transformer. The problems encountered in driving an inductive load are addressed by the LS7631/LS7632 CMOS ICs as follows:
1. Compensation for delayed triac cut-off. When a trigger pulse is due to occur at a conduction angle which coincides with the on-state of the triac, the trigger pulse is delayed until the triac has turned off. This eliminates the underlying cause of half-waving.
.
2. Compensation for delayed triac turn-on. At the set conduction angle, a triac trigger pulse of 130.2s (60 Hz) is issued by the IC. If the triac fails to fire, a second trigger pulse of 260.4s width is issued 1ms later as a second attempt to fire the triac during the same half-cycle.
3. Safety-shutdown.
If the frequency of occurrences of the delayed cut-off and delayed turn-on exceeds a preset threshold, a shutdown is initiated by turning off the triac trigger pulses. The safetyshutdown threshold value is accumulated in a 4-bit Up/Down counter. The count increments for every occurrence of delayed cut-off or delayed turn-on and decrements once every 8 SYNC pulses (AC line cycles). The counter will not decrement below zero. If the count reaches 15, the safetyshut- down is effected.
LS7632 Maximum Ratings
| PARAMETER |
SYMBOL |
VALUE |
UNITS |
| DC Supply Voltage |
VDD - VSS |
7.0 |
V |
| Voltage at any input |
VIN |
VSS - .3 to VDD + .3 |
V |
| Operating temperature |
TA |
0 to +90 |
°C |
| Storage temperature |
TSTG |
-65 to +150 |
°C |
LS7632 Features
• Touch or pushbutton control of incandescent lamps and transformer-coupled halogen lamps
• Transformer can be Magnetic or Electronic
• Direct replacement for P/N SLB 0587
• Automatic safety shutdown
• PLL synchronization allows use as a Wall Switch
• Three operating modes
• Extension input for remote activation
• 50Hz/60Hz AC line frequency
• +5V Power Supply (VDD - VSS)
• LS7631, LS7632 (DIP); LS7631-S, LS7632-S (SOIC)
• Transformer can be Magnetic or Electronic
• Direct replacement for P/N SLB 0587
• Automatic safety shutdown
• PLL synchronization allows use as a Wall Switch
• Three operating modes
• Extension input for remote activation
• 50Hz/60Hz AC line frequency
• +5V Power Supply (VDD - VSS)
• LS7631, LS7632 (DIP); LS7631-S, LS7632-S (SOIC)
LS7632 Typical Application
Electronic dimmers for wall switch control of ceiling mounted lighting, foot switch control of large floor lamps and hand switch control of table lamps.
LS7632 Connection Diagram
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