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LX2203 Datasheet(PDF) 9 Page - Microsemi Corporation |
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LX2203 Datasheet(HTML) 9 Page - Microsemi Corporation |
9 / 11 page LX2203 PRODUCTION DATA SHEET Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 Copyright © 2004 Rev. 1.0a, 2005-08-10 Li-Ion Battery Charger TM ® APPLICATION NOTE (CONTINU E D) CONSTANT CHARGE CURRENT PROGRAMMING (CONTINUED) The table below lists some popular Constant Current Settings along with the associated CCP pin current and programming resistor: Charge Current Iccp Current Rccp Value 1.0A 13.75µA 90.9K 500mA 6.22µA 200K 100mA 1.00µA 1200K It is possible to change the constant current setting by changing the Rccp resistor while in charge mode. Since the termination current is independent of the charge current, lowering the constant charge current will increase the charge time, but will not reduce the stored charge in the battery at the charge termination point. The circuit in Figure 4 is an example of a battery charger configured to charge at 1A, 500mA or 100mA. The switches are logically controlled and reduce the resistance at the CCP pin when switched in. It is possible to eliminate the MOSFET devices if open drain logic is available. The logic for the CP1 and CP2 would normally come from the appliance processor which would need to have the capability to communicate over the USB interface. If there is only one power connector and the USB interface is active, the logic could assume the power was coming from the USB bus and not the wall adapter. If the USB interface is active, the USB application will know if the appliance has been enumerated as a high or low load and would set CP1 and CP2 appropriately. It is possible to change the current programming circuit to drive it directly with CMOS logic, but this requires that the CMOS logic power supply be well regulated (+/-2%). Each switch resistor leg in Figure 4 can be replaced with a two resistor network tied to the output of a CMOS gate. 1.21M R1 CCP R2 Vcc 500mA/100mA 1.21M 243k CCP 500mA/100mA Rsw Figure 6 – Circuits to provide 100mA and 500mA constant charge currents. The values of R1 and R2 are selected such that: 25 . 1 R R R V 2 1 2 CC = + × & SW 2 1 2 1 R R R R R = + × Solving these equations: 25 . 1 R V R SW CC 1 × = & SW 1 SW 1 2 R R R R R − × = For Vcc = 3.3V and Rsw = 243k; R1 = 649k; R2 = 392k. These values should provide charge currents of 100mA and 500mA . COMPENSATION CAPACITOR A compensation capacitor of value 0.01uF is required between the CMP pin and VIN. |
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