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AIC1761-CS14 Datasheet(PDF) 10 Page - Analog Devices |
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AIC1761-CS14 Datasheet(HTML) 10 Page - Analog Devices |
10 / 15 page AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 10 The LED indicators work as the following table: LED PIN VOUT PIN FLASH PIN Fast Charge OFF ON ON Trickle Charge ON OFF FLASH VBT Abnormal OFF OFF OFF LED pin is used in conjunction with VOUT pin while FLASH pin works alone. Referring to the APPLICATION EXAMPLES (Fig. 10), the temperature limits beyond where the fast charge is prohibited can be set by choosing values for resistors and the thermistor of the thermistor divider according to the following formula: R18 = 3.57 RT1 RT2/ (RT1 - RT2) R19 = 10 RT1 RT2 / (1.218 RT1 - 11.2 RT2) RT1 : Thermistor resistance at low temperature limit. RT2 : Thermistor resistance at high temperature limit. BATTERY VOLTAGE DIVIDER To ensure proper operation of the AIC1761/1766, selection of resistor values for battery voltage di- vider must meet the following two crucial require- ments: 1. When the battery pack is disconnected from the charge circuitry, the voltage of VBT pin must be higher than 4.0V or lower than 0.5 V to put the AIC1761/1766 in reset status, where VOUT and LED pins become high impedance and FLASH pin (only for 14 pin version) goes to high level. 2. When the battery pack is connected in normal operation, the VBT pin voltage must remain in the range of 0.8V to 3.5V even when the bat- tery pack voltage reaches to its peak when near full charge. Take charging a 8-cell battery pack as an example. The highest voltage would be 16V when fully charged if the highest voltage of a fully charged battery cell is assumed to be 2V. Since the VBT pin voltage is restricted to be no higher than 3.5V, the battery voltage divider ratio must be higher than 3.57 (16V/3.5V -1). In other words, resistor R14+R13 must be greater than 535K Ω if R15 is 150K Ω (refer to Fig. 4). When the battery pack is disconnected from the charging circuitry the VBT pin voltage must be higher than 4.0V, dictating VBAT node voltage of the charging circuitry to be higher than 18.3V (4V x 4.57). Practically, however, the charging circuit supply voltage +VIN should be higher than 18.5V in order to ensure proper op- eration. In the case that supply voltage +VIN can not meet this requirement, application circuit of Fig. 4 can be adopted to get around this problem. 9012 Q2 9012 Q1 27K 270K 270K +VIN 150K 390K 150K 4.7 µF 0.1 µF 0.1 µF C1 150K VBAT GND VBT R3 R2 R14 R13 R5 C2 R15 C3 R7 + Fig. 4 Battery Voltage can be Raised to VIN - 0.9V when being Charged. CHARGER CIRCUIT DESIGN TIPS 1. A stable constant charge current is crucial for reliable precision −∆V detection by the AIC1761/1766 since fluctuation of the charge current can cause fluctuation of the battery terminal voltage due to battery internal series resistance, which will likely result in errors −∆V detection by a properly functioning AIC1761/1766. 2. To prevent the AIC1761/1766 from over- voltage damage, make sure that none of AIC1761/1766 pins sees any voltage beyond the supply voltage, which needs to be be- tween +9V and +18V. |
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