TOUCH CONTROL HALOGEN LAMP DIMMER
1
2345678
LS7631LS7632
MODE CAP SYNC TRIG
V SS (-V)
EXT
SENS
FIGURE 1
LSI
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 u as a Wall Switch •Three operating modes
•Extension input for remote activation •50Hz/60Hz AC line frequency •+5V Power Supply (V DD - V SS )
•LS7631, LS7632 (DIP); LS7631-S, LS7632-S (SOIC)
APPLICATIONS:
Electronic dimmers for wall switch control of ceiling mounted lighting, foot switch control of large floor lamps and hand switch control of table lamps.
BACKGROUND AND GENERAL DESCRIPTION:
A typical electronic dimmer may not operate properly with the in-ductive load encountered when driving a transformer-coupled low-voltage halogen lamp. The inductive load can cau a phenomenon called half-waving, wherein the triac fires in al-ternate half-cycles only, which may lead to the thermal de-struction of the load transformer. The problems encountered in driving an inductive load are addresd by the LS7631/LS7632CMOS ICs as follows:
1. Compensation for delayed triac cut-off.
When a trigger pul is due to occur at a conduction angle which coincides with the on-state of the triac, the trigger pul is delayed until the triac has turned off. This eliminates the underlying cau of half-waving..
2. Compensation for delayed triac turn-on.
At the t conduction angle, a triac trigger pul of
130.2µs (60 Hz) is issued by the IC. If the triac fails to fire, a cond trigger pul of 260.4µs width is issued 1ms later as a cond 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 pret threshold, a shutdown is initiated by turning off the triac trigger puls. The safety-shutdown 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 puls (AC line cycles). The counter will not decrement below zero. If the count reaches 15, the safety-shut-down is effected.
INPUT/OUTPUT DESCRIPTION:
V DD (Pin 1) Supply voltage positive terminal.Vss (Pin 7) Supply voltage negative terminal.
MODE (Pin 2) - See Table 1
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Both LS7631 and LS7632 can operate in 3 different modes. The 3-state MODE input lects the operating modes:Vss = Mode 0; Float = Mode 1; V DD = Mode 2CAP (Pin 3) - PLL filter capacitor input. See Figure 6.
SYNC (Pin 4) - See Figure 6
The AC line frequency is applied to this input. All internal timings are synchronized to the AC pha t
hrough a PLL circuit. The Load On/Off status information is also derived from this input.SENS (Pin 5) - See Table 1
A Logic 0 applied to this input alters the TRIG output either by turning it on, turning it off or by changing its conduction angle.Specifically which action takes place is dependent on the type of activation of the SENS input, namely SHORT or LONG touch and the prior state of TRIG output.
EXT (Pin 6)
Same functionality as the SENS input, except that a Logic 1 is the active level at this input. EXT input is intended to be operated from a remote site with long cable connection, when noi can be expected. The sampling method ud at this input makes it less nsitive to noi.
TRIG (Pin 8)
The TRIG output is a low level pul occurring once every half-cycle of the AC and is intended to drive the gate of a triac in -ries with the load. The conduction angle, ø, of the TRIG pul can be varied by means of LONG and SHORT touches at either the SENS or the EXT input.
turnto
November 2002
7631/7632-112002-1
LSI/CSI
LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405
LS7631/7632
U L
®
A3800
PIN ASSIGNMENT - TOP VIEW
The functional differences between LS7631 and LS7632 are:
考研培训机构
LS7631 - When a LONG touch is applied, the dimming direction auto-matically revers whenever maximum or minimum conduction an-gles are reached.
LS7632 - When a LONG touch is applied, the dimming stops when-ever maximum or minimum conduction angles are reached. In order to change dimming levels from maximum or minimum, LONG touch must be removed and reapplied.The purpo of this feature is to allow the ur to positively locate maximum and minimum conduction angles.
nickcarterTABLE 1
MODE SHORT TOUCH LONG TOUCH DIMMING REVERSAL PRE-TOUCH Ø POST-TOUCH Ø PRE-TOUCH Ø POST-TOUCH Ø (Note 5)
OFF MAX(Note 1)OFF/MIN Varies up from MIN N/A
0ON OFF MAX Varies down from MAX N/A
INTERMEDIATE Varies from INTERMEDIATE NO
OFF
MEMORY
OFF Varies from memory (Notes 2, 3,4) YES 1
3年级英语下册(Notes 2, 3)MIN Varies up from MIN N/A ON
OFF
MAX
Varies down from MAX
N/A INTERMEDIATE Varies from INTERMEDIATE YES
OFF MAX (Note 1)
OFF/MIN Varies up from MIN N/A 2ON OFF
MAX
英语六年级上册Varies down from MAX
N/A INTERMEDIATE
oa是什么意思
Varies from INTERMEDIATE
YES
Note 1:
A soft turn-on is produced by slewing up the conduction angle, ø, from minimum at the rate of 1.4˚/4.17ms (60Hz).
There are a total of 84 discrete values of ø.
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Note 2: A soft turn-on is produced by slewing up ø, from minimum to memory.
Upon power-up the memory value is defaulted to maximum conduction angle.
Note 3: “Memory” refers to the conduction angle, ø, which existed prior to the current off-state.
Note 4: A soft turn-on is produced by slewing up ø from minimum to memory upon which the dimming is started.Note 5: NO = Dimming direction does not rever from prior dimming direction.
YES = Dimming direction does rever from prior dimming direction. N/A = Does not apply.
momo什么意思
7631/7632-111902-2
LS7632 NOTE : If the Ur applies a LONG Touch when the TRIG Conduction Angle is within a “few” degrees of Maximum or Minimum, the TRIG Conduction Angle can move to Maximum or Minimum and stop without the Ur being able to obrve a change in brightness. Therefore,the Ur should be instructed that if no change in bright-ness is obrved in respon to a LONG Touch, the LONG Touch should be removed and reapplied in order to produce a change in brightness.
ABSOLUTE MAXIMUM RATINGS:PARAMETER SYMBOL VALUE
UNIT DC supply voltage V DD - Vss +7
elevationV Any input voltage
V IN Vss - 0.3 to V DD + 0.3
V Operating temperature T A 0 to +90°C Storage temperature
T STG
-65 to +150
°C
DC ELECTRICAL CHARACTERISTICS:
(TA = +25˚C, all voltages referenced to Vss. V DD = +5V unless otherwi noted.)
PARAMETER SYMBOL MIN TYP MAX UNIT CONDITION Supply voltage V DD 4.5 5.0 5.5V -Supply current I DD -300400µA Output unloaded V DD = 5.5V
SYNC Lo V ISL -- 2.1V -SYNC Hi V ISH 2.9--V -EXT, SENS Lo V IEL -- 1.5V -EXT, SENS H i V IEH 3.5--V - TRIG Lo V OL -0.2-V - TRIG H i V OH - 5.0-
V
-TRIG Sink Current
I TSNK
35
-
- mA
V OTRIG = 2.5V
