KA35S281-SN 데이터 시트보기 (PDF) - Kasin Electronics Corporation
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KA35S281-SN Datasheet PDF : 19 Pages
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KA35S280/281
Lead-Acid Battery Charger
- 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.
I MAX
Voltage
Fast Charge
Phase 2
Phase 3
VBLK
Maintenance
Phase 4
VFLT
VTH
I COND
I MIN
I FLT
Phase 1
Current
Time
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).
I MAX
I COND
I MIN
I FLT
Phase 1
Current
Voltage
Phase 2
Fast Charge
Time
Figure 5 – Current Charge
Phase 3
Maintenance
VBLK
VFLT
VTH
2011 Nov 18
© 2011 Kasin Technology Inc.
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