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UB211CxxG-AF5-R Datasheet(PDF) 6 Page - Unisonic Technologies |
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UB211CxxG-AF5-R Datasheet(HTML) 6 Page - Unisonic Technologies |
6 / 10 page UB211C Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 6 of 10 www.unisonic.com.tw QW-R502-482.b OPERATION (Cont.) 4. Discharge Overcurrent Condition (Discharge Overcurrent, Load Short-circuiting) When a battery in the normal condition is in the status where the voltage of the VM pin is equal to or higher than the discharge overcurrent detection voltage because the discharge current is higher than the specified value and the status lasts for the discharge overcurrent detection delay time, the discharge control FET is turned off and discharging is stopped. This status is called the discharge overcurrent condition. In the discharge overcurrent condition, the VM pin and VSS pin are shorted by the resistor between VM pin and VSS pin (RVMS) in the IC. However, the voltage of the VM pin is at the VDD potential due to the load as long as the load is connected. When the load is disconnected, the VM pin returns to the VSS potential. This IC detects the condition when the impedance between the EB+ pin and EB− pin (Refer to the typical application circuit ) increases and is equal to the impedance that enables automatic restoration and the voltage at the VM pin returns to discharge overcurrent detection voltage (VDIOV) or lower, the discharge overcurrent condition is restored to the normal condition. Even if the connected impedance is smaller than automatic restoration level, the UTC UB211C Series will be restored to the normal status from discharge overcurrent detection status when the voltage at the VM pin becomes the discharge overcurrent detection voltage (VDIOV) or lower by connecting the charger. The resistance (RVMD) between the VM pin and VDD pin is not connected in the discharge overcurrent detection condition. 5. Charge Overcurrent Condition When a battery in the normal status is in the status where the voltage of the VM pin is lower than the charge overcurrent detection voltage because the charge current is higher than the specified value and the status lasts for the charge overcurrent detection delay time, the charge control FET is turned off and charging is stopped. This status is called the charge overcurrent status. This IC will be restored to the normal status from the charge overcurrent status when, the voltage at the VM pin returns to charge overcurrent detection voltage (VCIOV) or higher by removing the charger. The charge overcurrent detection function does not work in the overdischarge status. The resistance (RVMD) between the VM pin and VDD pin, and the resistance (RVMS) between the VM pin and VSS pin are not connected in the charge overcurrent status. 6. 0 V Battery Charging Function “Unavailable” This function inhibits recharging when a battery that is internally short-circuited (0 V battery) is connected. When the battery voltage is the 0 V battery charge inhibition battery voltage (V0INH) or lower, the charging control FET gate is fixed to the EB− pin (Refer to the typical application circuit) voltage to inhibit charging. When the battery voltage is the 0 V battery charge inhibition battery voltage (V0INH) or higher, charging can be performed. Caution Some battery providers do not recommend charging for a completely self-discharged battery. Please ask the battery provider to determine whether to enable or inhibit the 0 V battery charging function. 7. Delay Circuit (1) The discharge overcurrent detection delay time (tDIOV) and the load short-circuiting detection delay time (tSHORT) start when the discharge overcurrent detection voltage (VDIOV) is detected. When the load shortcircuiting detection voltage (VSHORT) is detected over the load short-circuiting detection delay time (tSHORT) after the detection of discharge overcurrent detection voltage (VDIOV), the UTC UB211C turns the discharging control FET off within tSHORT from the time of detecting VSHORT. (2) When any overcurrent is detected and the overcurrent continues for longer than the overdischarge detection delay time (tDL) without the load being released, the status changes to the power-down status at the point where the battery voltage falls below overdischarge detection voltage (VDL). (3) When the battery voltage falls below overdischarge detection voltage (VDL) due to overcurrent, the UTC UB211C Series turns the discharging control FET off via overcurrent detection. In this case, if the recovery of the battery voltage is so slow that the battery voltage after the overdischarge detection delay time is still lower than the overdischarge detection voltage, UTC UB211C Series shifts to the power-down status. |
Similar Part No. - UB211CxxG-AF5-R |
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Similar Description - UB211CxxG-AF5-R |
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