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AAT8636-S3-T Datasheet(PDF) 10 Page - Advanced Analog Technology, Inc. |
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AAT8636-S3-T Datasheet(HTML) 10 Page - Advanced Analog Technology, Inc. |
10 / 16 page Advanced Analog Technology, Inc. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 16 V 1.0 AAT8636 Series OPERATION (CONT.) 3. COM2 (Over Discharge Detector) COM2 monitors the cell voltage at the DD V pin. When DD V drops below the over discharge threshold 1 D V during the discharging process, COM1 detects an over charging condition and after delay time ( 1 D t ) elapses, the OUT D pin falls to a low level and thus turning off the external discharge control N-channel MOSFET. As soon as this happens, the VN pin will be changed to high level by an internal PMOS and the AAT8636 series will enter the standby mode. Connecting the battery pack to a charger is the required condition for AAT8636 series to recover from standby mode. With the charger connected, the charge current can flow through the parasitic diode of the external discharge control N-channel MOSFET while DD V is still lower than the over-discharge threshold. Once DD V is charged up to a value higher than 1 D V, the OUT D pin goes to a high level. This leads to the “ON” state of both the charge and discharge control MOSFETs, and the charging process proceeds on as long as the charger is connected. Connecting a charger to the battery pack when DD V is already higher than 1 D V will make OUT D instantaneously high . 4. COM3 (Over Current Detector, Short Circuit Protector) The over current detector and short circuit protector function normally when both the charge and discharge control N-channel MOSFETs are “ON”. In standard operation, voltage on VN pin will be either slightly higher or lower than GND, depending on the impedance of the two MOSFETs. However, when the VN pin voltage rises to a value between the short circuit detection voltage short V and over current detection voltage OC V , the AAT8636 series detect an over current condition. As a result, the external discharge control N-channel MOSFET goes to “OFF” with OUT D pin at the low state. An output delay time for the over current detection is internally fixed. A quick recovery of VN from a value between short V and OC V to the normal value within the delay time keeps the discharge control FET staying at the “ON” state. Short circuit may as well be explained as a “serious” over current condition. When the VN pin voltage rises to a value not only higher than OC V but also higher than short V , the short circuit protector will shut down the discharge MOSFET immediately to protect battery pack from being damaged or exploding. The VN pin has a built-in pull down resistor. Thus once the factors that cause over current or short circuit is removed, the VN pin will be pulled down to ground level through the internal resistor. Therefore, with VN lower than the over current and short circuit protection threshold, OUT D will be turned back on and the AAT8636 series can continue normal charge or discharge operation. When over current or short circuit occurs, the AAT8636 series will not enter a standby mode. |
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