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AIC1804BCS Datasheet(PDF) 9 Page - Analog Intergrations Corporation |
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AIC1804BCS Datasheet(HTML) 9 Page - Analog Intergrations Corporation |
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9 / 12 page  AIC1804 9 to protection of external MOSFETs Cell-Balancing Bleeding after Overcharge When either of the battery cells is overcharged, the AIC1804 provides the cell-balancing bleeding function to discharge the overcharged cell at about 9mA until the voltage of the overcharged cell decreases to overcharge release voltage (VOCR or VOCP-VHYS). Connecting UD1, UD2, UD3 and UD4 pins to the positive terminals of battery cells BAT1, BAT2, BAT3 and BAT4 accomplish this function, respectively. Inserting resistors along UD2 pin to BAT2 positive terminal path and UD4 pin to BAT4 positive terminal path can decrease the bleeding current. Power-Down after Overdischarge When overdischarge occurs, the AIC1804 will go into power-down mode, turning off all the timing generation and detection circuitry to reduce the quiescent current to about 2.2 µA (V CC=9.2V). In the unusual case where one battery cell is overdischarged while another one under overcharge condition, the AIC1804 will turn off all the detection circuitry except the overcharge detection circuit for the cell under overcharge condition. Charge Detection after Overdischarge When overdischarge occurs, the discharge control MOSFET M1 turns off and discharging is inhibited. However, charging is still permitted through the parasitic diode of M1. Once the charger is connected to the battery pack, the AIC1804 immediately turns on all the timing generation and detection circuitry and goes into normal mode. Charging is determined to be in progress if the CS pin voltage is higher than VCC + 0.4V (charge detection threshold voltage VCH). DESIGN GUIDE Cell Number Selection The user must configure the AIC1804 for three or four series cells application. For three-cell application, NSL pin should be connected directly to VCC pin. For four-cell application, NSL pin should be connected directly to GND pin. No. of Series Cells NSL Pin 3-cell Connected to VCC 4-cell Connected to GND The protection circuit for three-cell lithium-ion battery pack is shown in application examples Fig. 1. Setting the Overcharge and Overdischarge Delay Time The overcharge delay time is set by the external capacitor C TC and the overdischarge delay time is set by the external capacitor CTD. The relationship between capacitance of the external capacitors and delay time is tabulated as below. CTC ‚CTD(nF) TOC ‚TOD(mS) 1 21 5 52 10 132 22 253 33 347 47 617 68 748 82 1004 100 1630 The delay time can also be approximately calculated by the following equations (if CTC, CTD ≤ 82nF) : TOC (mS) = 11.8 x CTC(nF) TOD (mS) = 11.8 x CTD(nF) Setting the Overcurrent Delay Time 1 The overcurrent delay time 1 (TOI1) at 0.15V < |
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