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KA35S280-DI Datasheet(PDF) 7 Page - Kasin Electronics Corporation |
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KA35S280-DI Datasheet(HTML) 7 Page - Kasin Electronics Corporation |
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7 / 19 page  KA35S280/281 Lead-Acid Battery Charger 2011 Nov 18 © 2011 Kasin Technology Inc. 7 - Charge algorithms - 3-Step voltage charge This algorithm consists of four phases (figure 4): 1. Phase1 - Qualification: The charging current is limited at ICOND (=IMAX/5) until the cell voltage rises to VTH to prevent battery damage. In this condition The KA35S28X enters the Charge Pending state and waits until the battery voltage rises to VTH. Charge Pending is annunciated by LED0 and LED3 flashing. 2. Phase2 - Fast Charge 1: The charging current is limited at IMAX (1.25 IMAX when faster pin is 0) until the cell voltage rises to VBLK. 3. Phase3 - Fast Charge 2: The charging voltage is regulated at VBLK until the charging current drops below IMIN ( 0.1IMAX) 4. Phase4 - Maintenance: The charging voltage is regulated at VFLT. V BLK V FLT V TH Time I MAX I COND I MIN I FLT Phase 1 Phase 2 Phase 3 Phase 4 Fast Charge Maintenance Voltage Current Figure 4 – 3-Step Voltage Charge - Current charge This algorithm consists of three phases (figure 5): 1. Phase1 - Qualification: The charging current is limited at ICOND (=IMAX/5) until the cell voltage rises to VTH to prevent battery damage. In this condition The KA35S28X enters the Charge Pending state and waits until the battery voltage rises to VTH. Charge Pending is annunciated by LED0 and LED3 flashing. 2. Phase 2 - Fast Charge: The charging current is regulated at IMAX (1.25 IMAX when faster pin is 0) until the cell voltage rises to VBLK or the “Second Difference” of cell voltage drops below -8mV while VBAT is over 2.0V. 3. Phase3 - Maintenance: Fixed-width pulses of charging current = ICOND are modulated in frequency to achieve an average value of IMIN (0.1IMAX). V BLK V FLT V TH Time I MAX I COND I MIN I FLT Phase 1 Phase 2 Phase 3 Fast Charge Maintenance Voltage Current Figure 5 – Current Charge |
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