LS7340 Datasheet PDF - LSI Computer Systems

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LS7340
LSI Computer Systems

Part Number LS7340
Description AUTO SHUT-OFF AC POWER SWITCH WITH PROGRAMMABLE TIMER
Page 5 Pages


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LSI/CSI
LS7339-7340
U® L
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
June 2001
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) - See Figure 1
LS7339-S, LS7340-S (SOIC)
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
ON 1
8 SYNC
OFF 2
VDD (-V) 3
7 CAP
6 OSC
TRIG 4
5 V SS (+V)
FIGURE 1
DESCRIPTION:
The LS7339 and LS7340 are monolithic MOS integrated circuits de-
signed to turn a triac On and Off in a Power Switch for AC loads. Ac-
tivation 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 De-
scription, 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 ac-
curately 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
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 tran-
sitions 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 cy-
cles, 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 cy-
cles, TS1, turns TRIG Off. This input is designed for Switch con-
trol only. (See Figure 5.)
VDD (Pin 3)
Supply voltage negative terminal.
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 in-
put to VDD through S1. STATE 1 is a quasi-stable state.
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 in-
ductive 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.)
7339/40-032499-1



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CAP (Pin 7)
The CAP input is for external component connection for the PLL fil-
ter 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.)
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.
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.
SYNC
TRIG
ø
Tw Tw
FIGURE 2. OUTPUT CONDUCTION ANGLE, Ø
FIGURE 3. PHASE ANGLE, Ø, vs ON AND OFF
ON
OFF
TS1
TS1
OFF
Ø
TD1
159˚/STATE 1
OFF/STATE 0
TS1
<TD1
159˚/STATE 1
TD1
TD1 RESTART
TS1
OFF
TS1
159˚/STATE 1
OFF
FIGURE 4. LS7339/7340 BLOCK DIAGRAM
SYNC 8
CAP 7
ON 1
OFF 2
OSC 6
V SS 5
V DD 3
BUF
PHASE-
LOCK
LOOP
BUF
BUF
CONTROL
LOGIC
OSC/TIMER
(+V)
(-V)
SYNC
PHASE-ANGLE
POINTER
ø DECODE
DIGITAL
COMPARATOR
DRIVER
4 TRIG
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.
7339/40-032499-2



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ABSOLUTE MAXIMUM RATINGS:
PARAMETER
DC supply voltage
Any input voltage
Operating temperature
Storage temperature
SYMBOL
VSS - VDD
VIN
TA
TSTG
DC ELECTRICAL CHARACTERISTICS:
(TA = 25°C, all voltages referenced to VDD)
PARAMETER
Supply Voltage
Supply Current
SYMBOL
VSS
ISS
VALUE
+20
VSS-20 to VSS + .5
0 to +85
-65 to +150
MIN TYP
+12 -
- 1.6
MAX
+18
2.2
Input Voltages
SYNC Lo
SYNC Hi
ON Lo
ON Hi
OFF Lo
OFF Hi
Input Current
SYNC, ON &
OFF Hi
SYNC, ON &
OFF Lo
TRIG Hi Voltage
TRIG Lo Voltage
TRIG Sink Current
VIRL
VIRH
VIOL
VIOH
VIVL
VIVH
IIH
IIL
VOH
VOL
IOS
0
VSS-5.5
0
VSS-2
0
VSS-2
-
-
-
-
-
-
-
-
--
- VSS
- VSS-8
25 -
VSS-9.5
VSS
VSS-8
VSS
VSS-8
VSS
110
100
-
-
-
TRANSIENT CHARACTERISTICS (See Fig. 2 and 3)
(All timings are based on Fs = 60Hz, unless otherwise specified.)
PARAMETER
SYMBOL MIN TYP
SYNC Frequency
Fs 40 -
ON/OFF Sense Time
Ts1
50 -
TRIG Pulse Width
(LS7339)
(LS7340)
Tw - 1.0
Tw - 33
STATE 1 Time-out
TD1 - 255RC
MAX
70
Infinite
-
-
-
UNIT
V
V
°C
°C
UNIT
V
mA
V
V
V
V
V
V
uA
nA
V
V
mA
UNIT
Hz
ms
ms
µs
s
CONDITIONS
-
VSS = +15V,
Output off
-
-
-
-
-
-
With Series 1.5M
Resistor to 115VAC
-
-
VSS = +15V
VSS = +15V,
VOL = VSS - 4V
COMPONENTS
Z1, D1, R1, C2, C3
R2, C4
C1, L1
C5
R5
R6, R7, C6
R3, R4
S1
7339/40-032499-3
TABLE 2. COMPONENT FUNCTIONAL DESCRIPTION FOR FIGURE 5
FUNCTIONAL DESCRIPTION
DC Power Supply.
Current limit and filter AC for SYNC input.
RFI filtering for AC Mains.
PLL filter capacitor.
Current limiting and isolation betweenIC output and Triac Gate.
Oscillator R-C network.
Potentiometer R6 required only if providing user adjustment of Time-out, TD1.
Pullup resistors to establish normally inactive condition of ON and OFF inputs.
Momentary Double Throw Switch used to activate appropriate input.



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FIGURE 5. A TYPICAL AUTO SHUT-OFF AC POWER SWITCH
P
SEE
NOTE 2
G
R8 MT1
T1
C7 MT2
Z1
AC
MAINS
C1 R2
D1
L1
C2
+
C3
-
R1
LOAD
A
SEE
B NOTE 1
N
R5
R3 R4
S1 ON
OFF
43 2
1
TRIG V DD OFF ON
R6 L S 7 3 3 9
V SS OSC CAP SYNC
56
78
R7
-+
C6
C5 C4
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.
115VAC
220VAC
115VAC
220VAC
(1)(3) R1 150, 1W 360, 2W (1)(2)C3 100µF
100µF
(2)(4) R1 82
82
(3)(4)C3 47µF
47µF
R2 1.5M
1.5M
C4 470pF
470pF
R3 100k
100k
C5 0.047µF
0.047µF
R4 100k
100k
C6 (6)
(6)
R5 100
100
C7 0.1µF, 200V 0.1µF, 400V
R6 (5)(6)
(5)(6)
Z1 15V, 1/2W 15V, 1/2W
R7 (5)(6)
(5)(6)
D1 1N4148
1N4148
R8 1.8k, 1W 1.8k, 2W
L1 100µH
200µH
C1 0.15µF, 200V 0.15µF, 400V (7)T1 Q4008L4 Q5004L4
(1) C2 1.0µF, 200V 0.47µF, 400V
(2) C2 0.47µF, 200V 0.22µF, 400V
(3) C2 0.33µF, 200V 0.22µF, 400V
(4) C2 0.22µF, 200V 0.1µF, 400V
(1) LS7339, Connection A
(2) LS7339, Connection B
(3) LS7340, Connection A
(4) LS7340, Connection B
(5) 100kΩ ≤ (R6 + R7) 10M
(6) (R6 + R7)C6 5ms
(7) Typical
All Resistors 1/4W, all Capacitors 25V unless otherwise specified
7339-060201-4



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