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參數(shù)資料
| 型號： | ICS1708N |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | IC REG LDO 1A 10V TO220FP |
| 中文描述： | QuickSaver充電控制IC的鎳鎘和鎳氫電池 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 936K |
| 代理商： | ICS1708N |
8
ICS1708
As an example, suppose that a current source has an open circuit voltage of 12V as shown in Figure 8.
Figure 8: Open Circuit Reference Example
The maximum battery voltage of a nearly full six-cell pack with current applied is determined to be 9.6V. The voltage at OPREF should
then be set at a point between 1.6V (9.6V/6 cells=1.6V) and 2V (12V/6=2V). This can be accomplished with a pull-down resistor. Refer to
the VIN and OPREF resistor tables in the
Applications Information
section. From the VIN table, the divider resistors are 100k
and
20k
for R1 and R2. From the OPREF table, the pull-down resistor is 47K
for R3. If R3 is 47K
, the voltage at OPREF is typically
1.78V since the internal pull-up at the OPREF pin is 85k
. Figure 8 show an alternate approach for setting the voltage on OPREF for tight
tolerance applications.
Power: VDD pin 8
The power supply for the device must be connected to the VDD pin. The voltage is +5 VDC nominal, series regulated for proper noise
rejection. A 100mA or higher current rating supplies the controllers maximum of 11mA average demand that includes brief 50mA peaks.
Peripheral circuits current requirements are added to these requirements. See Pin Descriptions for additional information.
Grounding: VSS pin 6
This pin is connected directly to a solid (low impedance) ground that connects at or close to battery minus. See the section Pin Descriptions
and Applications Information (PC Board Design Considerations) for additional information.
Charge Rate Selection
The voltage set on CMN pin 3 prior to the start of fast charge sets one of three fast charge rates shown in Table 2.
Table 2: Charge Rate List
Selected Charge Rate
Topping Charge Pulse
Rate
Maintenance Charge
Pulse Rate
Fast Charge Timer
Duration (after power-
up or battery insertion)
21 min
75 min
212 min
4C (15 min)
1C (60 min)
C/2.5 (150 min)
one every 41 sec
one every 11 sec
one every 5 sec
one every 161 sec
one every 41 sec
one every 17 sec
See the section on
Controller Operation
for additional information on the topping charge and maintenance charge. See the section on
Charge Termination
Methods
for additional information on the charge timer.
+ 5 V
R4 = 1.3k, 1%
R3 = 2.21k, 1%
R1 = 100k
R2 = 20k
6 cells
(9.6 V)
+
-
VIN =
OPREF = 1.89V
current source on (no battery)
(open circuit voltage = 12V)
{
.60V (battery present)
2.00V (no battery)
Alternate resistor divider at the OPREF
pin for tight tolerance applications
Resistor divider at the VIN
pin
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