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EUP8051A-42MIR1 Datasheet(PDF) 11 Page - Eutech Microelectronics Inc |
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EUP8051A-42MIR1 Datasheet(HTML) 11 Page - Eutech Microelectronics Inc |
11 / 15 page EUP8051A DS8051A Ver 1.1 Nov. 2006 11 Qualification and Precharge When power is applied, the EUP8051A starts a charge-cycle if a battery is already present or when a battery is inserted. Charge qualification is based on battery temperature and voltage. The EUP8051A suspends charge if the battery temperature is outside the V(TS1) to V(TS2) range and suspends charge until the battery temperature is within the allowed range. The EUP8051A also checks the battery voltage. If the battery voltage is below the precharge threshold V(min), the EUP8051A uses precharge to condition the battery. The conditioning charge rate I(PRECHG) is set at approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass-element during the initial stage of charge. See Figure5 for a typical charge-profile. Current Regulation Phase The EUP8051A regulates current while the battery-pack voltage is less than the regulation voltage, VO(REG). The EUP8051A monitors charge current at the SNS input by the voltage drop across a sense-resistor, RSNS, in series with the battery pack. In current sensing configuration (Figure6), RSNS is between the VCC and SNS pins, charge-current feedback, applied through pin SNS, maintains a voltage of V(SNS) across the current sense resistor. The following formula calculates the value of the sense resistor: O(REG) I (SNS) V SNS R = ---------------------------- (1) Where IO(REG) is the desired charging current. Example: For 0.55A, RSNS: 0.22V/0.55A: 0.4Ω For 1.0A, RSNS: 0.22V/1.0A: 0.22Ω Voltage Regulation Phase The voltage regulation feedback is through the BAT pin. This input is tied directly to the positive side of the battery pack. The EUP8051A monitors the battery-pack voltage between the BAT and VSS pins. The EUP8051A is offered in two fixed-voltage versions:4.2V. FB/CE Pin Function This pin has two functions, one is to enable/disable the charge function, and the other is to finely adjust battery regulation voltage. Connect this pin to VDD to enable EUP8051A, and connect to ground to disable it (Figure7). If this pin is connected to a voltage divider as shown in Figure8, it can be a 2.15V reference voltage to adjust the output regulation voltage as desired. |
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