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DS2711Z+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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DS2711Z+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 15 page DS2711/DS2712: Loose Cell NiMH Charger 7 of 15 DETAILED DESCRIPTION Charge Algorithm Overview A charge cycle begins in one of three ways: with the application of power to the DS2711 with cell(s) already inserted, with the detection of cell insertion after power-up, or when exiting suspend mode with cell(s) inserted. The charge cycle begins with precharge qualification to prevent fast charging of deeply depleted cells or charging under extreme temperature conditions. precharging is performed at a reduced rate until each cell reaches 1V. The algorithm proceeds to a fast-charge phase, which includes cell tests to avoid accidental charging of alkaline cells or NiMH cells that are worn-out or damaged. Fast charging continues as long as the cell temperature(s) are less than 50 °C (based on THM1, THM2 voltages) and the open-circuit cell voltage(s) are between 1.0V and 1.75V. Fast charging terminates by the - ΔV (negative delta voltage) method. The top-off charge phase follows to completely charge the cells. After the top-off charge timer expires, the maintenance charge phase continues indefinitely to keep the cells at a full state of charge. Maximum voltage, temperature, and charge-time monitoring during all charge phases act as secondary or safety termination methods to provide additional protection from overcharge. Each cell is monitored independently, and in parallel mode the charge phase of each cell is independently controlled. Series Charge Configuration The DS2711/DS2712 series configuration supports one or two-slot stand-alone and one or two cell in-system chargers. The single-cell-series mode charges one cell while the two-cell-series mode charges two series cells. Since the cells are charged in series, cell sizes should not be mixed in the series configuration. In the application example in Figure 3, charge current is gated to the battery cells by a PNP transistor under the control of the CC1 pin of the DS2711. Current regulation is performed outside of this example schematic using the current-sense feedback provided by the DS2711 CSOUT pin. The DS2712 can also be used in this circuit to provide switch-mode control on the CSOUT pin. RSNS = 0.125 Ω sets the charge source current, ICHG, to 1A. In series mode, the effective charge current is 0.969 x ICHG = 969mA. Figure 3. SERIES CONFIGURATION WITH EXTERNAL CURRENT REGULATION |
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Similar Description - DS2711Z+ |
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