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參數(shù)資料
| 型號： | ICS1700AS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| 中文描述： | QuickSaver充電控制器的鎳鎘和鎳氫電池 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 204K |
| 代理商： | ICS1700AS |
11
ICS1700A
To set the voltage at the THERM pin for 1.67V at 25
°
C, the
equivalent divider looks like Figure 9.
Table 3: Thermistor Voltage Thresholds
Using a thermal switch for hot battery detection:
A thermal switch that opens at about 45
°
C is recommended. The
thermal switch must be connected between the THERM pin and
ground. When the thermal switch is closed, the voltage at the
THERM pin must be below 0.5V for normal operation. When the
thermal switch opens (see Figure 10), the internal pull-up at the
THERM pin will raise the voltage above 4.2V and the
ICS1700A
will shut down and will not restart unless reset. Table 4 contains
the internal voltage thresholds used with a thermal switch.
Figure 9: Equivalent voltage divider
The parallel resistance
R
||
is calculated:
R
||
= 5V - 1.67V =20k
.
1.67V/10k
The internal pull-up resistance R
pu
and the parallel resistance R
||
are
known so the external fixed resistor can be calculated from:
R
pu
R
||
R
fix
= __________ .
R
pu
-
R
||
Substituting in known values: R
fix
= 27.27k
. A 27k
standard
value is used for R
fix
.
Since the thermistor resistance R
is specified by manufacturers at
a particular temperature, the voltage across the thermistor V
th
at
that temperature can be calculated from:
R
th
(5V)
V
th
= __________ (5V),
R
pu
+
R
||
with the drop across the resistor divider equal to 5V. For this
example, the calculated voltage with R
th
=18k
at 10
°
C is 2.37V
and with R
=4.7k
at 45
°
C the voltage is 0.95V. Table 3 lists the
internal thresholds for hot and cold battery detection. If the voltage
across the thermistor (at the THERM pin) drops below 0.93V, the
ICS1700A
will shut down due to a hot battery fault condition and
will not restart unless reset. If the voltage dropped across the
thermistor is above 2.4V before fast charge is initiated, the
ICS1700A
will begin a reduced current charge. See the
Cold
Battery Charging
section for more information.
Figure 10: Thermal switch to connection to
ground at the THERM pin
Table 4: Thermal Switch Voltage Thresholds
THERM pin
R = 75k
normally closed thermal switch
opens at 45oC
V
DD
Parameter
Voltage
Battery
Temperature
<10
°
C
Cold Battery Thermistor
Voltage
Hot Battery Thermistor
Voltage
>2.4
<0.93
>45
°
C
Parameter
Voltage
Battery
Temperature
>45
°
C
Open Thermal Switch
Voltage
Closed Thermal Switch
Voltage
>4.2
<0.5
<45
°
C
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|---|---|
| ICS1700AST | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
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| ICS1702 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1702M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
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