LS7339 查看數據表（PDF） - LSI Corporation
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LS7339 Datasheet PDF : 4 Pages
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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
MAIN
S
C1
R2
D1
L1
C2
R1
+
C3
-
LOAD
A
SEE
B
NOTE 1
N
R5
R3 R4
S1
ON
OFF
43
2
1
TRIG V DD OFF ON
R6
LS7339
V SS OSC CAP SYNC
56
7
8
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
(1)(3) R1 150Ω, 1W 360Ω, 2W
(2)(4) R1 82Ω
82Ω
R2 1.5MΩ
1.5MΩ
R3 100kΩ
100kΩ
R4 100kΩ
100kΩ
R5 100Ω
100Ω
R6 (5)(6)
(5)(6)
R7 (5)(6)
(5)(6)
R8 1.8kΩ, 1W 1.8kΩ, 2W
C1 0.15µF, 200V 0.15µF, 400V
(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)(2) C3 100µF
100µF
(3)(4) C3 47µF
47µF
C4 470pF
470pF
C5 0.047µF
0.047µF
C6 (6)
(6)
C7 0.1µF, 200V 0.1µF, 400V
Z1 15V, 1/2W 15V, 1/2W
D1 1N4148
1N4148
L1 100µH
200µH
(7)T1 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
FIGURE 6. PRODUCING VERY LONG TIME-OUTS BY PULSE MODULATING THE OSCILLATOR
R2
D1
R1
Waveform A
Oscillator
Components
-V
43 2 1
TRIG VDD OFF ON
+V
LS7339
D2 R3
C2
-+
VSS OSC CAP SYNC
5 67 8
CD4093
C1 = 0.1µF
-V
T1
Waveform A
T2
Waveform B
Waveform B (Pulse Modulator)
T1
T1 ≈ R1 C1
T2 ≈ (R1 + R2)C1
Period = T1 + T2
Pulse Duty Cycle = T1/Period
Inverse of Pulse Duty Cycle = Period/T1 = 1 +T2/T1 = 2 + R2/R1
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
7339-012703-4
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