KA35S280-DI datasheet(10/19 Pages) KASIN

10 / 19 page

KA35S280/281

Lead-Acid Battery Charger

2011 Nov 18

Kasin Technology Inc.

- Charge monitoring

Charge status (figure 10) is annunciated by the LED driver outputs LED1 - LED3 (figure 11)

Voltage Profile for

Lead-Acid Charging with

Constant Current Regulation

Previous Discharge Capacity Returned, %

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

100

125

150

Charge Rate = C/20

Figure 10 - Voltage Roll-Off In Constant Current Charging Profile

KA35S28X

LED0

LED1

LED2

LED3

LED1

LED2

LED3

Figure 11

– LED Display

- Fault detection

- Battery insertion and removal

The KA35S28X uses VBAT to detect the presence or absence of a battery. The KA35S28X

determines that a battery is present when VBAT is between the High-Voltage Cutoff and the

Low-Voltage Cutoff. When VBAT is outside this range, the KA35S28X determines that no

battery is present and transitions to the Fault state. Also, sudden changes in battery voltage

can cause the fault state.

- Shorted, opened, or damaged cells detections

The KA35S28X can be detect shorted, opened, and damaged cells by using one of the

following below state:

High current detection

Non-rechargeable batteries detection

Changing in any of the buttons

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