Electronic Components Datasheet Search |
|
ICS1702 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
|
ICS1702 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
5 / 28 page 5 ICS1702 The discharge current pulse amplitude is typically set to about 2.5 times the amplitude of the charging current based on 1.4V/cell. For example, if the charge current is 4 amps, then the discharge current is set at about 10 amps. The energy removed during the discharge pulse is a fixed ratio to the positive charge rate. The amplitude of the discharge pulse does not affect the operation of the part as described in this section. A voltage acquisition window immediately follows a brief rest time after the discharge pulse. No charge is applied during the rest time or during the acquisition window to allow the cell chemistry to settle. Since no current is flowing, the measured cell voltage is not obscured by any internal or external IR drops or distortions caused by excess plate surface charge. The ICS1702 makes one continuous reading of the no-load battery voltage during the entire acquisition window. The voltage that is measured during this window contains less noise and is a more accurate representation of the true state of charge of the battery. If temperature termination is selected, the thermistor voltage is sampled after a brief rest time once the current supply to the battery is turned on. Topping Charge The third stage is a topping charge that applies current at a rate low enough to prevent cell heating but high enough to ensure a full charge. The topping charge applies a C/10 charging current for two hours. The current consists of the same pulse technique used during the fast charge stage; however, the duty cycle of the pulse sequence has been extended as shown in Figure 5. Extending the time between charge pulses allows the same charging current used in the fast charge stage so that no changes to the current source are necessary. For example, the same charge pulse that occurs every second at a 2C fast charge rate will occur every 20 seconds for a topping charge rate of C/10. The MMN indicator is activated continuously during this stage. Maintenance Charge The maintenance charge is intended to offset the natural self- discharge of NiCd or NiMH batteries by keeping the cells primed at peak charge. After the topping charge ends, the ICS1702 begins this charge stage by extending the duty cycle of the applied current pulses to a C/40 rate. The maintenance charge will last for as long as the battery voltage is greater than 0.5V at the VIN pin, or, if the ten hour timer mode is enabled, until the timer stops the controller. The MMN indicator is activated continuously during this stage. Figure 5: Representative timing diagram for topping and maintenance charge delay time time cycle time cycle |
Similar Part No. - ICS1702 |
|
Similar Description - ICS1702 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |