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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AAT3663 데이터시트(PDF) 16 Page - Advanced Analogic Technologies |
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AAT3663 데이터시트(HTML) 16 Page - Advanced Analogic Technologies |
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16 / 22 page  AAT3663 1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications 16 3663.2007.10.1.0 Protection Circuitry Programmable Timer Function The AAT3663 contains a watchdog timing circuit to shut down charging functions in the event of a defective battery cell not accepting a charge over a preset period of time. Typically, a 0.1μF ceramic capacitor is connected between the CT pin and ground. When a 0.1μF ceramic capacitor is used, the device will time out a shutdown condition if the trickle charge mode exceeds 25 minutes and a combined trickle charge plus constant current mode of 3 hours. When the device transitions to the constant voltage mode, the timing counter is reset and will time out after an additional 3 hours if the charge current does not drop to the charge ter- mination level. The AAT3663 has a battery fault detector, which, when used in conjunction with a 0.1μF capacitor on the CT pin, outputs a 1Hz signal with 50% duty cycle at the STAT1 pin in the event of a timeout while in the trickle charge mode. Table 3: Summary for a 0.1μF Ceramic Capacitor Used for the Timing Capacitor. The CT pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. Thus, if the timing capacitor were to be doubled from the nominal 0.1μF value, the timeout periods would be doubled. If the programmable watchdog timer function is not needed, it can be disabled by terminating the CT pin to ground. The CT pin should not be left floating or unterminated, as this will cause errors in the internal timing control circuit. The constant current provided to charge the timing capacitor is very small, and this pin is susceptible to noise and changes in capacitance value. Therefore, the timing capacitor should be physically located on the print- ed circuit board layout as close as possible to the CT pin. Since the accuracy of the internal timer is dominated by the capacitance value, a 10% toler- ance or better ceramic capacitor is recommended. Ceramic capacitor materials, such as X7R and X5R types, are a good choice for this application. Over-Voltage Protection An over-voltage event is defined as a condition where the voltage on the BAT pin exceeds the max- imum battery charge voltage and is set by the over- voltage protection threshold (V OVP). If an over-volt- age condition occurs, the AAT3663 charge control will shut down the device until the voltage on the BAT pin drops below V OVP. The AAT3663 will resume normal charging operation after the over- voltage condition is removed. During an over-volt- age event, the STAT LEDs will report a system fault. Over-Temperature Shutdown The AAT3663 has a thermal protection control cir- cuit which will shut down charging functions once the internal die temperature exceeds the over-tem- perature shutdown threshold. Once the internal die temperature falls below the hysteresis, normal operation will resume the previous charging state. Battery Temperature Fault Monitoring There are two AAT3663 temperature sense options, The AAT3663-1 and AAT3663-2. The AAT3663-1 option allows of the use of any NTC resistor. For ease of use, the AAT3663-2 option is factory set to function with typical 10k Ω NTC resistors and elimi- nates the need for a resistor divider pull up to the input power source. Regardless of the AAT3663 option selected, the internal system control checks battery temperature before starting the charge cycle and continues to monitor the battery temperature during all stages of the charging cycle. This is accomplished by moni- toring the voltage at the TS pin. In general, the sys- tem is intended for use with negative temperature coefficient thermistors (NTC) which are typically integrated into the battery package. The voltage on the TS pin resulting from the resistive load and applied current, should stay within a window bounded by the TS1 and TS2 specification thresh- olds. Refer to the Electrical Characteristics table for the TS1 and TS2 limits for a selected AAT3663 option. If the battery becomes too hot during charge cycle due to an internal fault or excessive charge current, the NTC thermistor will heat up and reduce in value. This in turn will pull the TS pin Mode Time Trickle Charge (TC) Time Out 25 minutes Trickle Charge (TC) + Constant 3 hours Current (CC) Mode Time Out Constant Voltage (CV) Mode Time Out 3 hours |
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