ICS1712N Galaxy Semi-Conductor Holdings Limited, ICS1712N Datasheet
ICS1712N
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ICS1712N Summary of contents
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QuickSaver® Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries General Description The ICS1712 is a CMOS device designed for the intelligent charge control of either nickel-cadmium (NiCd) or nickel-metal-hydride (NiMH) batteries. The controller uses a pulsed-current charging technique together with ...
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ICS1712 Pin Configuration Pin Definitions Pin Pin Name Type Number 1 CHG OUT 2 DCHG OUT 3 PFN OUT 4 CMN OUT 5 OTN OUT 6 SEL0 IN 7 VSS 8 AVSS 9 SEL1 IN 10 MRN ...
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Controller Operation Charging Stages The charging sequence consists of four stages. The application of current is shown graphically in Figure 1. The soft start stage gradually increases current levels up to the user selected fast charge rate during the first ...
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ICS1712 Initial Pulse Width cycle time Figure 3: Cycle-to-cycle increase of the soft-start current pulse widths Fast Charge In the second stage, the ICS1712 applies the charging current in a series of charge and discharge pulses. The technique consists of ...
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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. ...
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ICS1712 Charge Termination Methods Several charge termination schemes, including voltage slope, temperature slope, maximum temperature and two overall charge timers are available. The voltage slope and negative voltage slope methods may be used with or without the temperature slope and ...
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Temperature Slope Termination Temperature slope termination is based on the battery producing an accelerated rate of heating as the amount of readily chargeable material diminishes at full charge. An increase in battery (cell) heating due to the charging reaction will ...
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ICS1712 To determine the required thermistor characteristics for proper temperature slope termination, the battery temperature rise must be known or determined for the last minute prior to full charge. Maximum temperature termination is also enabled when temperature slope termination is ...
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Battery Polling Upon power-up or after a reset is issued, any excess charge from filter capacitors at the charging system terminals is removed with a series of discharge pulses. After the discharge pulse series is complete, the voltage at VIN ...
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ICS1712 Pin Descriptions The ICS1712 requires some external components to control the clock rate, sense temperature and provide an indicator display. The controller must be interfaced to an external power source that will provide the current required to charge a ...
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Charge Rate Selection: SEL0, SEL1 Pins The SEL0 and SEL1 inputs must be programmed by the user to inform the ICS1702 of the desired charge rate. When a low level is required, the pin must be grounded. When a high ...
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ICS1712 Master Reset: MRN Pin 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 75k . A logic low on the MRN pin must be ...
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To set the voltage at the THERM pin for 1.67V the equivalent divider looks like Figure 11. Figure 11: Equivalent voltage divider The parallel resistance R is calculated 1.67V R 1.67V/10k The internal pull-up ...
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ICS1712 For example, a battery was monitored as it charged rate ambient. In the final minute of charge, the battery temperature rose from 29 where full charge was detected. With ...
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Using no temperature sensor temperature sensor is not used, the THERM pin must be grounded. Termination Selection: DTSEL Pin The ICS1712 has the capability of either temperature slope termination, voltage slope termination simultaneously. The DTSEL pin has an ...
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ICS1712 Data Tables Supply Voltage Logic Input Levels Ambient Operating Temperature Storage Temperature Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only. Functional operation of the device at ...
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R 16k , C 100pF PARAMETER Clock Frequency Reset Pulse Duration Charge Pulse Width Discharge Pulse Width Rest Time Data Acquisition Time Cycle Time Capacitor Discharge Pulse Width Capacitor Discharge Pulse Period Polling Detect Pulse Width Polling Detect Pulse Period ...
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ICS1712 Applications Information To ensure proper operation of the ICS1712, external components must be properly selected. The external current source used must meet several important criteria to ensure optimal performance of the charging system. The charging current should be constant ...
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Voltage Slope Termination The voltage slope termination method used by the ICS1712 requires a nearly constant current flow into the battery during fast charge. Equipment that draws a known constant current while the battery is charging may use the voltage ...
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ICS1712 Maximum Temperature Termination Maximum temperature termination is best suited as a safety back- up feature. Maximum temperature termination requires that the thermal sensor be in intimate contact with the battery. A low thermal impedance contact area is required for ...
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V CONSTANT in CURRENT SOURCE + (note 2) 390 390 1k 1 (note 3) 2 FAULT 3 CHG 4 TEMP Notes: 1) Value of R3 determined by discharge current and ...
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... All package dimensions are in inches. All package dimensions are in inches. 16-Pin SOIC Package (150 mil) Ordering Information: ICS1712M, ICS1712MT, ICS1712S, ICS1712ST, ICS1712N Example: ICS 1712 ST Device type: Consists digits or numbers Prefix: ICS = Intelligent Charging Solution standard device 0.016 ...
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Galaxy Power Incorporated makes no claim about the capability of any particular battery (NiCd or NiMH) to accept a fast charge. GPI strongly recommends that the battery manufacturer be consulted before fast charging. GPI shall be held harmless for any ...
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ICS1712 NOTES 24 ...
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NOTES 25 ICS1712 ...
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ICS1712 NOTES 26 ...
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NOTES 27 ICS1712 ...
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ICS1712 GPI Sales Offices Headquarters Galaxy Power, Inc. PO Box 890 2500 Eisenhower Avenue Valley Forge, PA 19482-0890 Phone: 1-610-676-0188 FAX: 1-610-676-0189 Internet: www.galaxypower.com GPI Sales Representative March 3, 1999 28 ...