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ICS1722N 参数 Datasheet PDF下载

ICS1722N图片预览
型号: ICS1722N
PDF下载: 下载PDF文件 查看货源
内容描述: QuickSaver -R充电控制器用于镍镉和镍氢电池 [QuickSaver-R Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries]
分类和应用: 电池光电二极管控制器
文件页数/大小: 24 页 / 207 K
品牌: GALAXY [ GALAXY POWER, INC. ]
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ICS1722  
Master Reset: MRN Pin  
VIN pin  
R2  
The MRN pin is provided to re-program the controller for a new  
mode or charging sequence. This pin has an internal pull-up of  
about 75kW. A logic low on the MRN pin must be present for more  
than 700ms for a reset to occur. As long as the pin is low, the  
controller is held in a reset condition. A master reset is required to  
clear the charging system test, reset the ten hour timer, change  
charge rates or auxiliary modes. Upon power-up, the controller  
automatically resets itself.  
R1  
# of cells  
Clock Input: RC Pin  
The RC pin is used to set the frequency of the internal clock when  
an external 1 MHz clock is not available. An external resistor must  
be connected between this pin and VDD. An external capacitor  
must be connected between this pin and ground. The frequency of  
Figure 7: Resistor divider network  
at the VIN pin  
the internal clock will be about 1 MHz with a 16kW resistor and a  
100pF capacitor. All time durations noted in this document are  
based on a 1 MHz clock. Operating the clock at a lower frequency  
will proportionally change all time  
durations. Operating the clock at a frequency significantly lower  
than 1 MHz, without adjusting the charge current accordingly, will  
lessen the effectiveness of the fast charge timer and lower the  
accuracy of the controller. Operating the clock at a frequency  
greater than 1 MHz will also change all time durations and, without  
adjusting the charge current accordingly, may cause termination to  
occur due to the fast charge timer expiring rather than by the  
battery reaching full charge.  
Open Circuit Voltage Reference: OPREF Pin  
The OPREF pin has an internal 75kW pull-up resistor to VDD.  
OPREF requires an external pull-down resistor 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 ICS1722 assumes  
the battery has been removed and the ICS1722 enters the polling  
detect mode.  
The clock may be driven by a 1 MHz external 0 to 5V pulse  
provided the duty cycle is between 10% and 60%. The clock input  
For proper operation, the voltage at OPREF must be set below the  
(divided down) open circuit voltage produced by the current source  
and above the maximum normalized battery voltage. The OPREF  
pin voltage must not exceed 2.3V or it will prevent the start of fast  
charge. If the voltage on OPREF exceeds 4V, the controller will  
shutdown and must be reset.  
impedance is about 1kW.  
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 7. 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:  
As an example, suppose that a current source has an open circuit  
voltage of 12V as shown in Figure 8. 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 pull-  
down resistor. Refer to the VIN and OPREF resistor tables in the  
Applications Information section. From the VIN table, the divider  
resistors are 10kW and 2kW for R1 and R2. From the OPREF  
R1 = R2 * (# of cells -1) or R2 =  
R1  
table, the pull-down resistor is 43kW for R3. If R3 is 43kW, the  
voltage at OPREF is 1.82V since the internal pull-up at the OPREF  
(# of cells -1)  
pin is 75kW.  
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