參數(shù)資料
型號(hào)： ICS1702N
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(yè)數(shù)： 14/28頁(yè)
文件大小： 466K
代理商： ICS1702N
14
ICS1702
To set the voltage at the THERM pin for 1.67V at 25
°
C, the
equivalent divider looks like Figure 11.
Table 6: Thermistor Voltage Thresholds
Figure 11: Equivalent voltage divider
The parallel resistance
R
||
is calculated:
R
||
= 5V - 1.67V =20k
.
1.67V/10k
The internal pull-up resistance R
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
th
=4.7k
at 45
°
C the voltage is 0.95V. Table 6 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
ICS1702
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
ICS1702
will begin a reduced current charge. See the
Cold Battery
Charging
section for more information.
Using an NTC thermistor for temperature slope
termination:
As a battery approaches full charge, its accelerated rate of heating
can be used to terminate fast charge by detecting the large change
in the temperature slope. The large change in temperature slope is
proportional to the thermistor voltage change per unit of time. If
the DTSEL pin is programmed for temperature slope termination,
the controller will calculate the thermistor voltage slope and
terminate based on internally set thresholds as listed in Table 1.
The threshold is 40mV per minute for selected charge rates greater
than C/2, 28mV per minute for charge rates selected at or between
C/2 and C/3, and 18mV per minute for selected charge rates less
than C/3. The voltage across the thermistor must change at these
rates or greater to terminate the selected charge rate.
These thresholds correspond to a set change in thermistor
resistance when an external pull-up to 5V is used as shown in
Figure 11. Using the values calculated from the hot and cold
battery detection example, the percent change in the thermistor
resistance per minute for selected charge rates are provided. For
selected charge rates greater than C/2, the thermistor resistance
must decrease 4%/min. to terminate charge. For selected charge
rates at or between C/2 and C/3, the thermistor resistance must
decrease 3%/min. to terminate charge. For selected charge rates
less than C/3, the thermistor must decrease 2%/min. to terminate
charge.
Parameter
Voltage
Battery
Temperature
<10
°
C
Cold Battery Thermistor
Voltage
Hot Battery Thermistor
Voltage
>2.4
<0.93
>45
°
C
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