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ACT2801 Folha de dados(PDF) 14 Page - Active-Semi, Inc |
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ACT2801 Folha de dados(HTML) 14 Page - Active-Semi, Inc |
14 / 25 page Rev 9, 14-Mar-17 Innovative PowerTM - 14 - www.active-semi.com Copyright © 2015-2017 Active-Semi, Inc. ACT2801/ACT2801B/ACT2801C Input current limit at various resistor curve is shown in Figure 8. The ILIM pin voltage is proportional to input current until input current is limited, as shown in Figure 9. In application, if fast charge current setting is higher than input current limit, must be parallel a 0.47uF capacitor with RILIM as shown in Figure 10. Battery Fast Charge Current Battery fast charge current is set by a resistor connected from ICST pin to AGND as shown in Figure 11. Figure 12 gives out different fast charge current with various RICST. The battery fast charge current is estimated as the following equation: Boost Output Constant Current Boost output current is set by a resistor connected from IOST pin to AGND as shown in Figure 13. The boost output current is estimated as the following equation: Figure 14 gives out boost output current with various RIOST. The IOST pin ) (m s Rc ) (k R ) A ( 3 2 (A) I OST I IOST (5) Figure 13. Boost output current setting circuit VIN Input VOUT Rcs 50mΩ SW L Output Cout RILIM ILIM Iin Battery Figure 7. Input current limit setting circuit 3.0 2.5 2.0 1.5 1.0 0.5 0 RILIM (kΩ) 0.7 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 Figure 8. Input current limit setting (4) ) m ( Rcs ) k ( R ) A ( 25 . 1 ) A ( Ic ICST VIN Input VOUT Rcs 50mΩ SW L Output Battery CSP Cout ICST RICST Ic CSN RIN CIN Figure 11. Battery fast charge current setting Figure 12. Battery fast charge current setting RICST (kΩ) 0 10 20 30 40 50 60 70 80 2.1 1.8 1.5 1.2 0.9 0.6 0.3 0 Figure 14. Boost output current setting 1.9 1.6 1.3 1.0 0.7 0.4 RIOST (kΩ) 20 40 60 80 100 120 140 Input current (A) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 Figure 9. VILIM VS. input current VIN = 5.0V RILIM=1.5kΩ VIN = 5.0V Vbat=3.7V VIN = 5.0V Rcs 50mΩ SW L Output Battery Cout CSP CSN IOST RIOST Io VOUT VBAT = 3.7V CVout=4.5V VIN Input VOUT Rcs 50mΩ SW L Output Cout RILIM ILIM Iin Battery CILIM Figure 10. Input current limit smaller than fast charge current |
Nº de peça semelhante - ACT2801_17 |
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Descrição semelhante - ACT2801_17 |
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