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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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ACT2803 Fiches technique(PDF) 13 Page - Active-Semi, Inc |
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ACT2803 Fiches technique(HTML) 13 Page - Active-Semi, Inc |
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13 / 22 page  Rev 1, May-12-2016 Innovative PowerTM - 13 - www.active-semi.com Copyright © 2016 Active-Semi, Inc. ACT2803 APPLICATIONS INFORMATION Fast Charge Current Control The block diagram in Figure 2 shows how battery current is sensed for charge current control. Figure 2: Battery current monitoring A small percentage of charge current is sensed and sinked into a resistor connected at pin ICST. In charge mode, this would allow user to set fast charge current based on the following equation. For example, IC=1A with RCS=25mΩ and RICST=8kΩ. Recommended RICST is shown in following table: During discharge mode, inputs of battery current sense amp are flipped to sense discharge current, and voltage level at pin ICST can be used (by the system) to monitor the magnitude of discharge current based on the following equation. For example: VICST=0.4V with I_DISCHARGE=1A, and RICST=8kΩ. LED Threshold Setting LED1, LED2, LED3 and LED4 thresholds are adjustable with external resistors RLS1, RLS2, RLS3, and RLS4 connected from LEDLS1, LEDLS2, LEDLS3, LEDLS4 to APNG respectively, as shows in Figure3. Figure 3: LED threshold setting The following equation shows how the external resistor shifts the LED thresholds. The range of LED1‐LED4 indicator threshold shift from 5.5V‐ 8.8V. VLED Example is given by the below table: LED Hysteresis Window Setting The adjustable LED voltage thresholds are set for HZ mode. In charge mode, the measured battery voltage is higher than in HZ mode, while in discharge mode, the measured battery voltage is lower. To have relatively better “fuel gauge” for battery, a programmable hysteresis window will help. When the battery voltage goes up (in charge mode), the thresholds become higher, when the battery voltage goes down, lower thresholds are applied. ACT2803 provide HYST pin to set hysteresis window for each indication level as shows in Figure 3 . RLSx (kΩ) VLEDx (V) 40 8.2 43.2 8 47 7.798 49.1 7.7 57 7.395 60 7.3 67.5 7.1 RLSx (kΩ) VLEDx (V) 72 7 90 6.7 108 6.5 120 6.4 135 6.3 180 6.1 270 5.9 ) 1 ( ) ( * ) ( 5 1000 ) ( k R m R * A Ic ICST CS IC (A) RICST Units RCS=25mΩ RCS=50mΩ 0.8 10 5 kΩ 0.9 8.89 4.44 kΩ 1.0 8 4 kΩ 1.1 7.27 3.64 kΩ 1.2 6.67 3.33 kΩ 1.3 6.15 3.08 kΩ 1.4 5.71 2.86 kΩ 1.5 5.33 2.67 kΩ ) 2 ( 20 k R I V ICST DISCHARGE ICST ACT2803 RHYST RIMC RLS1 RLS2 RLS3 RLS4 ) 3 ( ) ( 108 5 . 5 ) ( k R k V V LSx V LEDX |
Numéro de pièce similaire - ACT2803 |
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Description similaire - ACT2803 |
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