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KA35S280-SI Datasheet(PDF) 6 Page - Kasin Electronics Corporation

No. de pieza KA35S280-SI
Descripción Electrónicos  Lead-Acid Battery Charger
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Fabricante Electrónico  KASIN [Kasin Electronics Corporation]
Página de inicio  http://www.kasincorp.com
Logo KASIN - Kasin Electronics Corporation

KA35S280-SI Datasheet(HTML) 6 Page - Kasin Electronics Corporation

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KA35S280/281
Lead-Acid Battery Charger
2011 Nov 18
© 2011
Kasin Technology Inc.
6
IMAX
Fast charge current specified as a function of
“C,” the capacity of the battery in
Ampere-hours (e.g., a charge rate of 1C for a 5Ah battery is 5A). Typical values
range from C/10 to C, although some battery vendors may approve higher
charge rates.
The KA35S28X monitors battery pack voltage at the VBAT pin. A voltage divider between the
positive and negative terminals of the battery pack is used to present a scaled battery pack
voltage to the VBAT pin. The KA35S28X also uses the voltage across a sense resistor (RSNS)
between the negative terminal of the battery pack and ground to monitor current. See
Figure 3 and below equations for the configuration of this network.
Equation 1:
And IMAX is determined by:
Equation 2:
Where:
N = Number of series cells in the battery pack
IMAX = Desired maximum charge current
RB1
RB2
KA35S28X
BAT-
BAT+
R SNS
VBAT
I BAT
Figure 3 - Configuring the Battery Divider
The KA35S28X internal band-gap reference voltage at 25°C is 2.2V. This reference shifts
with temperature at -3.9mV/°C to compensate for the negative temperature coefficient of
lead-acid chemistry.
The total resistance presented by the divider between BAT+ and BAT- (RB1 + RB2) should
be between 10
0KΩ and 1MΩ. The minimum value ensures that the divider network does
not drain the battery excessively when the power source is disconnected. Exceeding the
maximum value increases the noise susceptibility of the VBAT pin. 1% resistors are
recommended.
Table 6 shows the several examples of resistor selections.
Table 6
– RB
1, RB2 Values by Number of Cells and RSNS by Desired IMAX
N
RB1 (KΩ)
RB2 (KΩ)
IMAX
RSNS (Ω)
3 (6V)
57KΩ
33KΩ
0.5
0.4
6 (12V)
147KΩ
33KΩ
1A
0.2
12 (24V)
327KΩ
33KΩ
1.5A
0.13


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