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參數(shù)資料
| 型號(hào)： | ICS1702 |
| 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)： | 16/28頁 |
| 文件大小： | 466K |
| 代理商： | ICS1702 |
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16
ICS1702
Figure 13: Resistor divider network
at the VIN pin
Open Circuit Voltage Reference: OPREF Pin
The OPREF pin requires an external resistor divider to establish
the open circuit (no battery) voltage reference. The purpose of this
voltage reference is to detect the removal of the battery from the
charging system. The voltage at this pin is compared to the voltage
at the VIN pin when the current source is turned on. If the voltage
at VIN is greater than the voltage at OPREF, the
ICS1702
assumes
the battery has been removed and the
ICS1702
enters the polling
detect mode.
For proper operation, the voltage at OPREF must be set between
the (divided down) open circuit voltage produced by the current
source and the maximum normalized battery voltage. An example
is shown in Figure 14.
Suppose that a current source has an open circuit voltage of 12V.
The maximum expected battery voltage of a six-cell pack is
determined to be 9.6V. The voltage at OPREF should be set at a
point between 1.6V (9.6V/6 cells=1.6V) and 2V (12V/6=2V). This
is accomplished with a resistor divider network. In this example,
R4 and R3 are referred to V
DD
. Refer to the VIN and OPREF
divider resistor tables in the
Applications Information
section.
From the VIN table, the divider resistors are 10k
and 2k
for R1
and R2. From the OPREF table, the divider resistors are 2.2k
and
1.3k
for R3 and R4. If R3 is 2.2k
and R4 is 1.3k
, the voltage
at OPREF is 1.86V.
Using no temperature sensor:
If a temperature sensor is not used, the THERM pin must be
grounded.
Termination Selection: DTSEL Pin
The
ICS1702
has the capability of either temperature slope
termination, voltage slope termination or both methods
simultaneously. The DTSEL pin has an internal 75k
pull-down
resistor that enables voltage slope termination as the primary
method and is the default condition. Tying the pin high enables
both temperature slope and voltage slope termination methods.
Temperature slope termination as the primary method is enabled by
tying the DTSEL pin to the CMN output (pin 5). CMN must have
an external 15k
or lower value pull-up resistor to V
for proper
activation of temperature slope termination. The
ICS1702
must be
reset if a new termination method is desired. Table 8 summarizes
the DTSEL pin settings. NOTE: Maximum temperature and fast
charge timer termination methods are always enabled when using
temperature slope termination. Refer to the sections on
Fast
Charge
Timer
Termination
Termination
for more information.
and
Maximum
Temperature
Table 8: Termination Select List
Voltage Input: VIN Pin
The battery voltage must be normalized by an external resistor
divider network to one cell. The electrochemical potential of one
cell is about 1.2V. For example, if the battery consists of six cells
in series, the voltage at the VIN pin must be equal to the total
battery voltage divided by six. This can be accomplished with two
resistors, as shown in Figure 13. To determine the correct resistor
values, count the number of cells to be charged in series. Then
choose either R1 or R2 and solve for the other resistor using:
R1 = R2 * (# of cells -1) or R2 = R1
(# of cells -1)
R1
R2
VIN pin
# of cells
Tie DTSEL
Pin to ...
Low
(No Connect)
High
Result
Voltage slope termination only
Voltage slope and temperature slope
termination
Temperature slope termination only
(CMN with external pull-up to V
DD
)
CMN
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| ICS1702N | 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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