LSI/CSI UL LS7339-7340 ® LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 A3800 AUTO SHUT-OFF AC POWER SWITCH WITH PROGRAMMABLE TIMER DESCRIPTION: The LS7339 and LS7340 are MOS integrated circuits designed to turn a triac On and Off in a Power Switch for AC loads. Activation of the ON input will always turn the triac On and start a Timer. The triac remains On for the duration of the Timer which is controlled by an external R-C connected to the OSCILLATOR input. Activation of the OFF input will always turn the triac Off. The two ICs differ only in the width of the TRIG pulse used to trigger the triac. (See I/O Description, Pin 4.) In a typical application (Figure 5), the output of the LS7339 drives the gate of a triac in series with the load. Because the LS7339 is accurately synchronized to the line frequency with a phase-lock loop, the power delivered by the triac to the load is pure AC, allowing use with inductive loads such as motors and transformers. There are two states through which the LS7339 can be stepped. The states and their corresponding operating modes, phase angles, and delivered power levels are shown in Table 1. TABLE 1 (See Figures 2 and 3) STATE 0 STATE 1 OPERATING MODE OFF Timed-On PHASE ANGLE, ø No Output 159˚ % LOAD POWER (1) 0 99 (1) The percentage of full power delivered to a resistive load by the triac switch. OPERATING DESCRIPTION: Upon power up, internal power-on-reset starts the LS7339 in STATE 0. When the ON input transitions to logic 0, the circuit steps to STATE 1. When the OFF input transitions to logic 0, the circuit steps to STATE 0. When implemented as shown in the application example (Figure 5), this is accomplished by the momentary switching of the appropriate input to VDD through S1. STATE 1 is a quasi-stable state. 7339-012703-1 ON 1 OFF 2 V DD (-V) TRIG 3 LS7339/7340 APPLICATIONS: • AUTO SHUT-OFF TIMER for appliances such as coffee pots, curling irons, hair curlers, electric blankets, hand dryers. • TIMED-ON WALL SWITCH for incandescent lighting and heat lamps. PIN ASSIGNMENT - TOP VIEW LSI FEATURES: • Phase-Lock Loop Synchronization allows use in Wall Switch Applications. • PLL accuracy delivers Pure AC Power. • Timer programmable with external R-C. • ON input switches AC Power On and starts Timer. • OFF input switches AC Power Off. • 50/60Hz Line Frequency. • +12V to +18V Operation (VSS - VDD). • LS7339, LS7340 (DIP); LS7339-S, LS7340-S - See Figure 1 January 2003 4 8 SYNC 7 CAP 6 OSC 5 V SS (+V) FIGURE 1 If left in STATE 1, after a time-out period determined by the frequency set at the OSC input (See I/O Description, Pin 6), the circuit automatically steps to STATE 0. If the ON input transitions to logic 0 before completion of the time-out period in STATE 1, the Timer is restarted, beginning a new time-out INPUT/OUTPUT DESCRIPTION: ON (Pin 1) - See NOTE 1 A logic 0 applied to this input for a minimum of three SYNC cycles, TS1 (50ms for 60Hz, 60ms for 50Hz), turns TRIG On and starts a Timer. Upon completion of the Time-out, TD1, TRIG turns Off. While the Time-out is in progress a new transition to logic 0 at this input for a minimum of three SYNC Cycles, TS1, restarts the Timer. This input is designed for Touch or Switch control. (See Figure 5.) OFF (Pin 2) - See NOTE 2 A logic 0 applied to this input for a minimum of three SYNC cycles, TS1, turns TRIG Off. This input is designed for Switch control only. (See Figure 5.) VDD (Pin 3) Supply voltage negative terminal. TRIG (Pin 4) TRIG is a negative going pulse occurring once every half cycle of the SYNC input. Pulse width is 1ms (LS7339) or 33µs (LS7340). The LS7339 wide pulse width may be required for inductive loads. The LS7340 narrow pulse width allows use of a smaller value of C2 power supply capacitor. (See Figure 5.) VSS (Pin 5) Supply voltage positive terminal. OSC (Pin 6) An R-C network connected to this input controls the frequency of oscillation which determines the Time-out, TD1, in State 1. TD1 is approximately 255RC. The Oscillator is active only in State 1. Chip to chip Oscillation Tolerance is ±10% for fixed value of RC. Tie Pin 6 to VSS if a Time-out is not desired. (See Figure 5.) CAP (Pin 7) The CAP input is for external component connection for the PLL filter capacitor. (See Figure 5.) SYNC (Pin 8) The AC Line Frequency (50/60Hz) is applied to this input. The Phase-Lock Loop synchronizes all internal timings to the AC signal at the SYNC input. (See Figure 5.) SYNC ø NOTE 1: ON will function as described if OFF is at logic 1. If OFF is held at logic 0, the transitions at ON will not cause the output to turn On. TRIG NOTE 2: OFF will function as described if ON is at logic 1. If ON is held at logic 0, the transitions at OFF will not cause the the output to turn Off. Tw Tw FIGURE 2. OUTPUT CONDUCTION ANGLE, Ø FIGURE 3. OUTPUT PHASE ANGLE Ø VS ON AND OFF ON TS1 TS1 TS1 TS1 OFF TD1 TD1 <TD1 TS1 TD1 RESTART 159˚/STATE 1 Ø OFF 159˚/STATE 1 159˚/STATE 1 OFF OFF/STATE 0 OFF FIGURE 4. LS7339/7340 BLOCK DIAGRAM SYNC 8 CAP 7 BUF PHASELOCK LOOP DIGITAL COMPARATOR ON 1 BUF OFF 2 BUF OSC 6 V SS 5 (+V) V DD 3 (-V) 7339-012703-2 SYNC PHASE-ANGLE POINTER CONTROL LOGIC DRIVER 4 TRIG ø DECODE OSC/TIMER 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. ABSOLUTE MAXIMUM RATINGS: PARAMETER DC supply voltage Any input voltage Operating temperature Storage temperature SYMBOL VSS - VDD VIN TA TSTG VALUE +20 VSS - 20 to VSS + 0.5 0 to +85 -65 to +150 UNIT V V °C °C DC ELECTRICAL CHARACTERISTICS: (TA = 25°C, all voltages referenced to VDD) PARAMETER Supply Voltage Supply Current SYMBOL VSS ISS MIN +12 - TYP 1.6 MAX +18 2.2 UNIT V mA Input Voltages SYNC Lo SYNC Hi ON Lo ON Hi OFF Lo OFF Hi VIRL VIRH VIOL VIOH VIVL VIVH 0 VSS - 5.5 0 VSS - 2 0 VSS - 2 - VSS - 9.5 VS S VSS - 8 VSS VSS - 8 VSS V V V V V V - IIH - - 110 uA With Series 1.5MΩ Resistor to 115VAC IIL - - 100 nA - VOH VOL IOS 25 VSS VSS - 8 - - V V mA VSS = +15V VSS = +15V, VOL = VSS - 4V Input Current SYNC, ON & OFF Hi SYNC, ON & OFF Lo TRIG Hi Voltage TRIG Lo Voltage TRIG Sink Current CONDITIONS VSS = +15V, Output off TRANSIENT CHARACTERISTICS (See Fig. 2 and 3) (All timings are based on Fs = 60Hz, unless otherwise specified.) PARAMETER SYNC Frequency ON/OFF Sense Time SYMBOL Fs Ts1 MIN 40 50 TYP - MAX 70 Infinite UNIT Hz ms TRIG Pulse Width (LS7339) (LS7340) Tw Tw - 1.0 33 - ms µs STATE 1 Time-out TD1 - 255RC - s TABLE 2. COMPONENT FUNCTIONAL DESCRIPTION FOR FIGURE 5 COMPONENTS FUNCTIONAL DESCRIPTION Z1, D1, R1, C2, C3 DC Power Supply. R2, C4 Current limit and filter AC for SYNC input. C1, L1 RFI filtering for AC Mains. C5 PLL filter capacitor. R5 Current limiting and isolation between the IC output and Triac Gate. R6, R7, C6 Oscillator R-C network. Potentiometer R6 required only if providing user adjustment of Time-out, TD1. R3, R4 Pullup resistors to establish normally inactive condition of ON and OFF inputs. S1 Momentary Double Throw Switch used to activate appropriate input. 7339-012703-3 FIGURE 5. A TYPICAL AUTO SHUT-OFF AC POWER SWITCH P R5 G SEE NOTE 2 R8 MT1 R3 T1 C7 MT2 + Z1 - ON S1 C3 OFF D1 AC MAIN S C1 R2 R4 L1 4 C2 3 2 TRIG V DD R6 1 OFF ON LS7339 R1 V SS OSC 5 A B SEE NOTE 1 CAP SYNC 6 7 8 R7 LOAD C5 - C4 + C6 N NOTES: 1. Use Connection A when Neutral is not available. Use Connection B when Neutral is available. 2. Snubber Network C7, R8 may be required for some inductive loads. 3. See Table 2 for Component Functional Description. FIGURE 6. PRODUCING VERY LONG TIME-OUTS BY PULSE MODULATING THE OSCILLATOR -V 4 R2 TRIG 115VAC 220VAC D1 Oscillator Components R1 Waveform A (1)(3) R1 (2)(4) R1 R2 R3 R4 R5 R6 R7 R8 C1 (1) C2 (2) C2 (3) C2 (4) C2 (1)(2) C3 (3)(4) C3 C4 C5 C6 C7 Z1 D1 L1 (7)T1 150Ω, 1W 360Ω, 2W 82Ω 82Ω 1.5MΩ 1.5MΩ 100kΩ 100kΩ 100kΩ 100kΩ 100Ω 100Ω (5)(6) (5)(6) (5)(6) (5)(6) 1.8kΩ, 1W 1.8kΩ, 2W 0.15µF, 200V 0.15µF, 400V 1.0µF, 200V 0.47µF, 400V 0.47µF, 200V 0.22µF, 400V 0.33µF, 200V 0.22µF, 400V 0.22µF, 200V 0.1µF, 400V 100µF 100µF 47µF 47µF 470pF 470pF 0.047µF 0.047µF (6) (6) 0.1µF, 200V 0.1µF, 400V 15V, 1/2W 15V, 1/2W 1N4148 1N4148 100µH 200µH Q4008L4 Q5004L4 (1) LS7339, Connection A (7) Typical (2) LS7339, Connection B (3) LS7340, Connection A (4) LS7340, Connection B (5) 100kΩ ≤ (R6 + R7) ≤10MΩ (6) (R6 + R7)C6 ≥ 5ms All Resistors 1/4W, all Capacitors 25V 7339-012703-4 D2 R3 2 + 1 V DD OFF +V C2 - 3 ON LS7339 V SS OSC CAP SYNC 5 6 7 8 CD4093 C1 = 0.1µF -V Waveform B (Pulse Modulator) T1 T1 Waveform A T2 T1 ≈ R1 C1 Period = T1 + T2 T2 ≈ (R1 + R2)C1 Pulse Duty Cycle = T1/Period Inverse of Pulse Duty Cycle = Period/T1 = 1 +T2/T1 = 2 + R2/R1 Waveform B DESCRIPTION: The Oscillator resistor is normally returned to the negative terminal of the DC Supply. If this resistor is returned to a negative-going pulse instaed, the Oscillator R-C effectively becomes multiplied by the inverse of the Pulse Duty Cycle because the Oscillator R-C can chamge only while the pulse is present. (Pulse Modulation) In Figure 6, The Oscillator R is R3, the Oscillator C is C2 and the Pulse Modulator is Waveform B through isolation diode D2. The Multiplier, M = 2 + R2/R1 (the inverse of the Pulse Duty Cycle). EXAMPLE: R3 = 5.1MΩ, C2 = 1.0uF, Pulse Modulator = Waveform B and desired TD1 = 8 hours = 28,800 seconds. Since TD1 = 255 x M x R3 x C2, M calculates to be 22 for the selected Oscillator Components. With M = 22, R2/R1 = 20. If R2 = 3MΩ, R1 = 150kΩ