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參數(shù)資料
| 型號： | ELM380P |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | BATTERY CHARGER TIMER |
| 中文描述： | 電池充電器的計時器 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 28K |
| 代理商： | ELM380P |
Example Application
4 of 4
Figure 1 shows the ELM380 used in a typical
battery charger control circuit.
Power for this circuit is obtained from a 12V supply,
as shown. Usually there will be a voltage of about this
level available if the charger is to support 9V batteries.
The 12V has been reduced to 5V through a 78L05 low
power regulator. This is a relatively inexpensive and
convenient way to obtain a stable voltage for a circuit
such as this.
The required 120Hz for the clock input is obtained
from the full-wave bridge as shown below. A series
diode has been added to prevent back-feed from the
filter capacitors (which would put a constant high level
on the clock input), and a 47K
resistor is connected in
series with pin 5 to limit the current through the
protection diodes when the AC bridge voltage exceeds
the ELM380 supply levels.
After the peak of each sine wave, the series diode,
and for a time, the bridge diodes, will not be conducting.
This means that the clock input will be left floating,
which is not advisable with CMOS circuits. To provide a
ground reference during these ‘open circuit’ periods, the
100K
resistor was connected from this point to V
SS
.
The rest of the circuit is straightforward. Two
switches are provided for control. Both the momentary
action ‘start’ switch and the toggle type ‘8/14’ switch
have 300
series resistors for added ESD protection,
and rely on the internal pullup resistors to provide a full
logic swing when operated. The 300
resistors aren’t
strictly required, but are a nice addition to consider for
added protection.
Only one of the outputs is used for this circuit. Its
active high level is used to drive the NPN transistor into
conduction and energize the relay coil. Depending on
the circuit, a direct connection to the load might be
used, but the use of a relay allows for general control of
many different loads.
There are many other uses that this circuit could be
put to. It could actually be used for almost any
application that needs long time intervals… Lawn
watering controls… Auto-off lighting systems…
ELM380
ELM380DSB
< http://www.elmelectronics.com/ >Figure 1. Typical Charger Control Circuit
Charger
Enable
1
2
3
4
8
7
6
5
2.2K
2N3904
1N4001
+12V
12V Relay
open for 8 hrs
closed for 14
start
47K
300
8/14
300
100K
+5V
78L05
0.1μF
+12V
0.1μF
+5V
150μF
+
10VAC
60Hz
Supply
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ELM380SM | BATTERY CHARGER TIMER |
| ELM460SM | IMPOSSIBLE OSCILLATOR |
| ELM460 | IMPOSSIBLE OSCILLATOR |
| ELM460P | IMPOSSIBLE OSCILLATOR |
| ELM621 | SERIAL THREE BIT PORT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ELM380SM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BATTERY CHARGER TIMER |
| ELM381 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:60 Hz Long Interval Counter |
| ELM382 | 制造商:ELM 制造商全稱:ELM 功能描述:50 Hz Long Interval Counter |
| ELM38255GD | 功能描述:LED 電路板指示器 Vert LED Assembly 5mm Green 565 nm RoHS:否 制造商:Lumex LED 大小:3 mm 照明顏色:Green 波長:565 nm 光強度:30 mcd 安裝類型:SMD/SMT 顯示角:60 deg 封裝:Reel |
| ELM382P | 制造商:ELM 制造商全稱:ELM 功能描述:50 Hz Long Interval Counter |
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