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KA35S280 Scheda tecnica(PDF) 6 Page - Kasin Electronics Corporation |
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KA35S280 Scheda tecnica(HTML) 6 Page - Kasin Electronics Corporation |
6 / 19 page 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 Ω 6 (12V) 147KΩ 33KΩ 1A 0.2 Ω 12 (24V) 327KΩ 33KΩ 1.5A 0.13 Ω |
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