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KA35S280-DI датащи(PDF) 5 Page - Kasin Electronics Corporation

номер детали KA35S280-DI
подробное описание детали  Lead-Acid Battery Charger
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производитель  KASIN [Kasin Electronics Corporation]
домашняя страница  http://www.kasincorp.com
Logo KASIN - Kasin Electronics Corporation

KA35S280-DI датащи(HTML) 5 Page - Kasin Electronics Corporation

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KA35S280/281
Lead-Acid Battery Charger
2011 Nov 18
© 2011
Kasin Technology Inc.
5
- Pin Configuration
- Mode selection pins
The KA35S28X can be programmed into 3 different charge algorithm named as 3-step
voltage, current and pulsed current by mode selection pins. Table 3 shows the relations
between MS0/MS1 selection pins and IC operation.
Table 3
– Mode Selection pins
MS1
MS0
Mode
Description
0
0
0
Charge is disabled
0
1
1
3-step voltage charge
1
0
2
Current charge
1
1
3
Pulsed current Charge
- Faster charge pin
The faster charge pin can be change internal DC voltage threshold of max current by 25%
(50mV). In normal condition it is configured to 200mV by internal voltage reference
generator unit.
Table 4
– Mode Selection pins
Faster Pin
Description
0
Charge current increased by 25%
1
Normal current charge
- Cyclic/Float use pin
Due to recent design breakthroughs, the same battery may be used in either cyclic or
standby applications and it is necessary to set the charge voltage according to it. Inaccurate
voltage settings cause over- or under-charge. In applications where standby power is
required to operate when the power has been interrupted, continuous float charging is
recommended. Non-continuous cyclic charging is used primarily with portable equipment
where charging on an intermittent basis is appropriate.
The cyclic/float pin can be change internal charge reference voltage and method of
temperature compensation.
Table 5
– Mode Selection pins
Cyclic/Float Pin
Description
0
In cyclic use
1
In float use
- Fixed and Configurable Thresholds
The KA35S28X uses the following fixed thresholds:
VMAX
High-Cutoff Voltage: VBAT rising above this level is interpreted as battery
removal, cutting off charging current. VMAX = 0.6 * VCC.
VMIN
Low-Cutoff Voltage: VBAT dropping below this level is interpreted as battery
removal, cutting off charging current. VMIN = 0.2 * VCC.
VTH
Minimum Voltage: Used in pre-charge qualification. VTH = 0.34 * VCC.
ICOND
Conditioning Current: Used in the maintenance phase of the Current algorithm
and pre-charge qualification. ICOND = IMAX/5. IMAX is set by Equation 2.
Also the KA35S28X uses the following configurable thresholds:
VBLK
Upper voltage limit during fast charge, typically specified by the battery
manufacturers to be 2.3V in float and 2.45 in cyclic applications per cell @
25°C. KA35S28X uses 2.45V for VBLK when Cyclic/Float pin is set 0.
VFLT
Minimum charge voltage required to compensate
for the battery’s self-discharge
rate and maintain full charge on the battery.


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