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參數(shù)資料
| 型號(hào)： | LS7340 |
| 廠商： | LSI Corporation |
| 英文描述： | AUTO SHUT-OFF AC POWER SWITCH WITH PROGRAMMABLE TIMER |
| 中文描述： | 自動(dòng)關(guān)機(jī)AC電源開關(guān)，具有可編程定時(shí)器 |
| 文件頁(yè)數(shù)： | 5/5頁(yè) |
| 文件大小： | 54K |
| 代理商： | LS7340 |
FIGURE 6. PRODUCING VERY LONG TIME-OUTS BY PULSE MODULATING THE OSCILLATOR
Oscillator
Components
R2
R1
CD4093
C1 = 0.1μF
-V
R3
C2
-
+
4
3
TRIG
V
DD
V
SS
5
OSC
6
2
1
8
7
OFF
ON
CAP
SYNC
T1
T2
Waveform A
LS7339
T1
≈
R1 C1
T2
≈
(R1 + R2)C1
DESCRIPTION:
EXAMPLE:
D1
T1
Period = T1 + T2
Pulse Duty Cycle = T1/Period
-V
Waveform B (Pulse Modulator)
Inverse of Pulse Duty Cycle = Period/T1 = 1 +T2/T1 = 2 + R2/R1
Waveform A
Waveform B
+V
D2
The Oscillator resistor is normally returned to the negative terminal of the DC Supply. If this resistor is returned to
a negative-going pulse instead, the Oscillator R-C becomes effectively multiplied by the inverse of the Pulse Duty
Cycle, because the Oscillator R-C can charge 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).
R3 = 5.1M
, C2 = 1.0μF, Pulse Modulator = Waveform B and desired T
D1
= 8 hours = 28,800 sec.
Since T
D1
= 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 = 3M
, R1 = 150k
.
7339-060201-5
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