LS7535

LS7534 LSI | Alldatasheet

Document overview

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Technical content

FEATURES:

• Phase-lock loop synchronization allows use as a Wall Switch
• Brightness control of incandescent lamps with touch plates (LS7534) or mechanical switches (LS7535)
• Dual Controls eliminate confusion
• Soft turn-on /turn-off
• Controls the "Duty Cycle" from 23% to 88% (conduction angles for AC half-cycles between 41° and 159°, respectively)
• Operates at 50Hz/60Hz line frequency
• Input for slow dimming
• +12V to +18V DC supply voltage (VSS - VDD )
• LS7534/LS7535 (DIP); LS7534-S/LS7535-S SOIC - See Figure 1 DESCRIPTION: LS7534/LS7535 are monolithic, MOS integrated cir- cuits that are designed for brightness control of in- candescent lamps. The outputs of these ICs control the brightness of a lamp by controlling the firing an- gle of a triac connected in series with the lamp. All internal timings are synchronized with the line fre- quency by means of a built-in phase-lock loop cir- cuit. The output occurs once every half-cycle of the line frequency. Within the half-cycle, the output can be positioned anywhere between 159° 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 con- trolled by applying the proper logic levels at the UP and DOWN inputs. These functions may be implemented with very few interface components which is described in the ap- plication examples (See Fig. 5A and 5B). For touch plates, LS7534 is used (Fig. 5A). For mechanical switches, LS7535 is used (Fig. 5B). In the following Operating Description of the applica- tion examples, an Activation is Touch for LS7534 and Switch Closure for LS7535. Short Activation (34ms to 325ms) UP - When the lamp is off, if a short activation is applied to the UP input, the lamp brightness is ramped up to full-on or to a previous brightness stored in the memory. The ramp- up time from off to full-on is 2.8 sec. The ramp-up time from off to any other brightness is proportionally shorter. When the lamp is on at any brightness, a short activation applied to the UP input has no effect. DOWN - If a short activation is applied to the DOWN input, the lamp brightness is ramped down to off. The ramp-down time from full-on to off is 5.6 seconds. The ramp-down time from any other brightness is proportionally shorter. When the lamp is off, a short activation applied to the DOWN input has no effect. Long Activation (Greater than 334ms) UP - If a long activation is applied to the UP input, the lamp brightness ramps up from the pre-activation brightness as long as the activation is maintained or until the full bright- ness is reached. At full brightness any continued long ac- tivation has no further effect. DOWN - If a long activation is applied to the DOWN input, the lamp brightness is ramped down as long as the long ac- tivation is maintained or until the minimum brightness is reached. At minimum brightness, any continued long ac- tivation has no further effect. When the lamp is off, a long activation applied to the DOWN input has no effect. CONNECTION DIAGRAM - TOP VIEW LSI LS7534 FIGURE 1 TRIG V DD (-V) DOWN UP V SS (+V) DOZE CAP SYNC August 1996 7534/35-080796-1 LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 U L® A3800 LS7534 LS7535

INPUT 34ms to 325 ms More than 334ms UP DOWN PRE-ACTIVATION BRIGHTNESS Off Max. Intermediate Off Max. Intermediate POST-ACTIVATION BRIGHTNESS Memory ** (See Note 1) No Change No Change No Change Off * Off * PRE-ACTIVATION BRIGHTNESS Off Max. Intermediate Off Max. Intermediate POST-ACTIVATION BRIGHTNESS Increases from Min. No change Increases from pre- touch brightness No change Decreases from Max. Decreases from pre- touch brightness * 5.6 second ramp-down from max. to off. Ramp-down time from any other brightness is proportionally shorter. ** 2.8 second ramp-up from off to max. NOTE 1: "Memory" refers to the brightness stored in the memory. The brightness is stored in memory when the lamp is turned off by a short activation. First time after power-up, a short activation produces max. brightness. INPUT/OUTPUT DESCRIPTION: VSS (Pin 1) Supply voltage positive terminal. DOZE (Pin 2) A clock applied to this input causes the brightness to de- crease in equal increments with each negative transition of the clock. Eventually, when the lamp becomes off, this input has no further effect. The lamp can be turned on again by activating the UP input. For the transition from maximum brightness to off, a total of 83 clock pulses are needed at the DOZE input. When either the UP or the DOWN input is active, the DOZE input is disabled. CAP (Pin 3) The CAP input is for external component connection for the PLL filter capacitor. A capacitor of 0.047µF ± 20% should be used at this input. SYNC (Pin 4). The AC line frequency (50Hz/60Hz), when applied to this input, synchronizes all internal timings through a phase lock loop. The signal for this input may be obtained from the line voltage by employing the circuit arrangement shown in the application examples. UP (Pin 5). This input controls the turn-on and the conduction angle, ø , of the TRIG output. A description of this is provided in the DESCRIPTION and TABLE 1. For LS7534, a logic low level is the active level whereas for LS7535 a logic high level is the active level. LS7535 has an internal pull-down resistor of about 500K Ohms on this input. DOWN (Pin 6). This input controls the turn-off and the conduction angle, ø, of the TRIG output. A description of this is provided in the DESCRIPTION and TABLE 1. For LS7534, a logic low level is the active level, whereas for LS7535 a logic high level is the active level. LS7535 has an internal pull-down resistor of about 500K Ohms on this input. VDD (Pin 7). Supply voltage negative terminal. TRIG (Pin 8). The TRIG output provides a low level pulse occurring every half-cycle of the SYNC signal. The conduction angle, ø, of the TRIG output can be varied within the range of 41o to 159o by means of either the UP or the DOWN input. TABLE 1 7534/35-080796-2

ABSOLUTE MAXIMUM RATINGS: PARAMETER SYMBOL VALUE UNIT DC supply voltage VSS - VDD +20 V Any input voltage VIN VSS - 20 toVSS + 0.5 V Operating temperature TA 0 to +80 °C Storage temperature TSTG -65 to +150 °C DC ELECTRICAL CHARACTERISTICS: (TA = 25°C, all voltages referenced to VDD ) PARAMETER SYMBOL MIN TYP MAX UNIT CONDITIONS Supply voltage VSS +12 - +18 V - Supply current ISS - 1.2 1.7 mA VSS = +15V, Output off Input Voltages: DOZE LO VIZL 0 - VSS - 6 V - DOZE HI VIZH VSS - 2 - VSS V - SYNC LO VIRL 0 - VSS - 9.5 V - SYNC HI VIRH VSS - 5.5 - VSS V - UP, DOWN LO VIOL 0 - VSS - 8 V - UP, DOWN HI VIOH VSS - 2 - VSS V - Input Current: SYNC, UP, DOWN HI IIH - - 110 uA With Series 1.5MΩ Resistor to

115 VAC Line

SYNC, UP, DOWN LO IIL - - 100 nA - DOZE HI IIH - - 100 nA - DOZE LO IIL - - 100 nA - TRIG HI VOH - VSS - V - TRIG LO VOL - VSS - 8 - V VSS = +15V TRIG Sink Current IOS 50 - - mA VSS = +15V, VOL = VSS - 4V TRANSIENT CHARACTERISTICS (See Fig. 2 and 3) (All timings are based on fs = 60Hz, unless otherwise specified.) PARAMETER SYMBOL MIN TYP MAX UNIT SYNC frequency fs 40 - 70 Hz UP, DOWN duration (SHORT) Ts1 34 - 325 ms UP, DOWN duration (LONG) Ts2 334 - infinite ms ø ramp time, off to max TUS - 2.8 - sec (UP,SHORT) ø ramp time, min to max TUL - 3.6 - sec (UP,LONG) ø ramp time, max to min TDS - 5.6 - sec (DOWN,SHORT) ø ramp time, max to min TDL - 3.6 - sec (DOWN,LONG) TRIG pulse width TW - 33 - µs TRIG conduction angle (See Note) ø 41 - 159 degrees DOZE frequency fD 0 - 500 Hz NOTE: The phase delay caused by the typical RC network used between SYNC input and the AC line (See Fig. 5A and Fig. 5B) reduces the effective ø values by 8°. 7534/35-080796-3

Ø POINTER PHASE LOCK LOOP CONTROL LOGIC BUF BUF BUF BUF SYNC CAP DOZE DOWN UP (+V) (-V) FIGURE 4 LS7534/LS7535 BLOCK DIAGRAM V SS V DD APPLICATION EXAMPLES : Typical dimmer light switch circuit schematics are shown in Fig. 5A (LS7534) and Fig. 5B (LS7535). The brightness of the lamp is set by touching the UP and DOWN touch plates in Fig. 5A and closure of the UP and DOWN switches in Fig. 5B. The functions of different components are as follows:

• Z, D1, R1, C2 and C5 produce the 15V DC supply for the chip.
• R2 and C4 filter and current limit the AC signal for the SYNC input.
• C3 is the filter capacitor for the internal PLL.
• C1 and L are RFI filters.
• In Fig. 5A, R3 and R4 set the touch sensitivity of the UP and DOWN inputs.
• In Fig. 5B, R3 limits the current between Vss and the UP and DOWN inputs upon closure of a switch.
• The resistor and diode connected between the chip output and the triac gate provides current limiting and isolation for the chip. The resistor is R5 in Fig. 5A and R4 in Fig. 5B.
• In Fig. 5B, PCB layout may cause triac switching transients to be coupled to the UP or Down input which can have the effect of having a Long switch closure “lock-up” at a certain phase angle output. In this case, capacitors C6 and C7 must be added as shown. The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. 7534/35-080796-5

P 115VAC OR 220VAC N LOAD T L A B 1 2 3 4 8 7 6 5 R3C3 C4 TRIG V DD DOWN UP V SS DOZE CAP SYNC SEE NOTE 2 LS7534 DOZE CIRCUIT FIG. 6A V SS DZ UP V DD R4 R4 R4 R4 DOWN TOUCH PLATE UP TOUCH PLATE DOWN SEE NOTE 1 FIGURE 5A. TYPICAL LS7534 DIMMER LIGHT SWITCH G MT2 MT1 Z D2 115VAC C1 = 0.15µF, 200V R4 = 2.7MΩ , 1/4W C2 = See C2 Value Table R5 = See R5 Value Table C3 = 0.047µF, 25V D1, D2 = IN4148 C4 = 470pF, 25V Z = 15V, 1W (Zener) C5 = 47µF, 25V T = Q4004L4 Triac (Typical) R1 = 270Ω , 1W L = 100µH (RFI Filter) R2 = 1.5MΩ , 1/4W R3 = 1MΩ to 5MΩ , 1/4W (Select for sensitivity) (1) For Connection A. Use 1/4 W for Connection B. C2 VALUE TABLE R5 VALUE TABLE C2 = 0.33µF, 200V, Connection A R5 = 100Ω , 1/4W, 25mA Triac Gate 7534/35-041597-6 NOTES: 1) When DOZE circuit is used, break Pin 1 to Pin 2 connection. 2) Use Connection A when Neutral is not available. Use Connection B when Neutral is available. (1) 220VAC C1 = 0.15µF, 400V R4 = 4.7MΩ , 1/4W C2 = See C2 Value Table R5 = See R5 Value Table C3 = 0.047µF, 25V D1 , D2 = IN4148 C4 = 470pF, 25V Z = 15V, 1W (Zener) C5 = 47µF, 25V T = Q5004L4 Triac (Typical) R1 = 1kΩ , 2W L = 200µH (RFI Filter) R2 = 1.5MΩ , 1/4W R3 = 1MΩ to 5MΩ , 1/4W (Select for sensitivity) (2) For Connection A. Use 1/4W for Connection B. C2 VALUE TABLE R5 VALUE TABLE C2 = 0.22µF, 400V, Connection A R5 = 100Ω , 1/4W, 25mA Triac Gate C2 = 0.10µF, 400V, Connection B R5 = 50Ω , 1/4W, 50mA Triac Gate (2)

C1 = 0.15µF, 200V R2 = 1.5MΩ , 1/4W C2 = See C2 Value Table R3 = 27kΩ , 1/4W C3 = 0.047µF, 25V R4 = See R4 Value Table C4 = 470pF, 25V D1, D2 = IN4148 C5 = 47µF, 25V Z = 15V, 1W (Zener) C6,C7 = 0.001µF, 25V T = Q4004L4 Triac (Typical) R1 = 270Ω , 1W L = 100µH (RFI Filter) (1) For Connection A. Use 1/4W for Connection B. C2 VALUE TABLE R4 VALUE TABLE C2 = 0.33µF, 200V, Connection A R4 = 100Ω , 1/4W, 25mA Triac Gate C2 = 0.22µF, 200V, Connection B R4 = 50Ω , 1/4W, 50mA Triac Gate P 115VAC OR 220VAC N LOAD MT1 L Z A B 1 2 3 4 8 7 6 5 C3 C4 TRIG V DD DOWN UP V SS DOZE CAP SYNC SEE NOTE 2 LS7535 DOZE CIRCUIT FIG. 6B V SS DZ UP V DD DOWN SEE NOTE 1 FIGURE 5B. TYPICAL LS7535 DIMMER LIGHT SWITCH G UP T MT2 DOWN D2- SEE NOTE 3 C7. NOTES: 1) When DOZE circuit is used, break Pin 1 to Pin 2 connection. 2) Use Connection A when Neutral is not available. Use Connection B when Neutral is available . 3) C6 and C7 may be required in some PCB layouts to eliminate coupling from triac circuitry. (1) (2) 220VAC C1 = 0.15µF, 400V R2 = 1.5MΩ , 1/4W C2 = See C2 Value Table R3 = 27kΩ , 1/4W C3 = 0.047µF, 25V R4 = See R4 Value Table C4 = 470pF, 25V D1,D2 = IN4148 C5 = 47µF, 25V Z = 15V, 1W (Zener) C6,C7 = 0.001µF, 25V T = Q5004L4 Triac (Typical) R1 = 1kΩ , 2W L = 200µH (RFI Filter) (2) For Connection A. Use 1/4 W for Connection B. C2 VALUE TABLE R4 VALUE TABLE C2 = 0.22µF, 400V, Connection A R4 = 100Ω , 1/4W, 25mA Triac Gate C2 = 0.10µF, 400V, Connection B R4 = 50Ω , 1/4W, 50mA Triac Gate 7534/35-041597-7

4093 MP58098 +

NOTE: All Resistors 1/4 W, all Capacitors 25V. Doze switch sets the SR flip-flop, enabling the oscillator. til eventurally the lamp is shut- off. 5A and 5B, should be removed. FIGURE 7. OPERATING DESCRIPTION OF A FULL-FEATURE LS7535 WALL SWITCH (1) Last intensity achieved before turn off is stored as memory intensty. (2) On (Dim Up) varies intensity towards maximum and stops there. (3) Off (Dim Down) varies intensity towards minimum and stops there. (4) Auto-dimming period controlled by RC components and intensity level when Auto-Dim is activated. (5) Last intensity achieved before Auto-Dim started is stored as memory intensity.