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ACT2803 数据表(PDF) 14 Page - Active-Semi, Inc |
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ACT2803 数据表(HTML) 14 Page - Active-Semi, Inc |
14 / 22 page Rev 1, May-12-2016 Innovative PowerTM - 14 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 APPLICATIONS INFORMATION HYST pin is regulated at 1V. Its input current will determine hysteresis adjustment equally to all level. Connect HYST to APGN via a resistor to set hysteresis window. Beside the hysteresis window, to avoid comparison oscillation, fixed 100mV of hysteresis is added to each LEVEL comparator. Hysteresis window is given by below equation: RHYST Example is given by the below table: Battery Impedance Compensation To avoid the number of LEDs changes between charge and discharge modes. Internal impedance compensation circuit is built in. An external resistor is used to set the impedance from 100mΩ to 800mΩ. RIMC is corresponding to battery impedance. The LED1-4 thresholds shifted up and down based on the product of charge/discharge current and set impedance. RIMC value is given by below equation. In case not using compensation, float RIMC then there is no compensation affects to trig-points. RIMC example is given by the below table: Battery Temperature Monitering The ACT2803 monitors the battery pack temperature by measuring TH voltage at the TH pin as shows in Figure 4. The TH pin is connected to the thermistor resistor net which includes a negative temperature coefficient thermistor. An internal current source provides a bias current to generate TH voltage. The ACT2803 compares the voltage at the TH pin with the internal VTHH and VTHL thresholds to determine if charging or discharging is allowed. When VTH<VTHL or VTH >VTHH, it will be triggered latch off fault, there is 3 ways to wake up ACT2803 when VTH returns to the normal range. 1. Push PB when latch off bit is not set 2. I2C to clear faults in standby 3. Plug Vin to power up Figure 4: Thermistor setting RNTCc : NTC Resistor at cold temperature (Tcold) RNTCh : NTC Resistor at hot temperature (Thot) From (7) (8) (9) and (10) calculate Ra and Rb in charge mode, as the same method, the resistors in discharge mode can be calculated. For example, use NXRT15XH103 NTC resistor, the temperature in charge mode is 0℃ to 45℃,we know RNTCC=27.219k and 4.917k at 0℃ to 45℃, respectively. We can calculate Ra=33kΩ and Rb=2.87kΩ based on the above formulas. As the same method we can calculate the value when the temperature is -20℃ to 60℃. Cell Balance Setting ACT2803 has integrated a cell balance feature to reduce the un-balance charge between dual batteries. Normally cell balance is activated during Fast Charge and Top Off modes. 4 ) ( K HYST R 54K V HYST RHYST (kΩ) LED1 VHYST LED2 VHYST LED3 VHYST LED4 VHYST Floating 0mV 0mV 0mV 0mV 270 120mV 120mV 100mV 100mV 135 240mV 240mV 200mV 200mV 90 360mV 360mV 300mV 300mV 67.5 480mV 480mV 400mV 400mV 54 600mV 600mV 500mV 500mV 45 720mV 720mV 600mV 600mV ) 6 ( ) ( ) ( 2160 ) ( m R m R k k R BAT CS IMC RBAT (mΩ) 100 200 300 400 500 600 700 RCS = 25 mΩ 540k 270k 180k 135k 108k 90k 77k RCS = 50 mΩ 1080k 540k 360k 270k 216k 180k 154k ) 7 ( hot Rc I V CHG TCL ) 9 ( NTCh NTCh R Ra R Ra Rb hot Rc ) 10 ( NTCc NTCc R Ra R Ra Rb cold R ) 8 ( cold R I V CHG TCH + – + – TH VTCL=1V NTC VTCH=2.5V + – + – VTDL=0.57V VTDH=2.5V IDIS=100uA ICHG=140uA ACT2803 CHG_HOT CHG_COLD DIS_HOT DIS_COLD Rb Ra Li+ Battery Pack 5 * 6 . 0 1 : 2 * 5 . 0 3 : 4 HYST V HYST V HYST HYST |
类似零件编号 - ACT2803 |
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类似说明 - ACT2803 |
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