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BQ2057DGK Datasheet(PDF) 10 Page - Texas Instruments |
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BQ2057DGK Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page bq2057, bq2057C bq2057T, bq2057W SLUS025F − MAY 2001 − REVISED JULY 2002 10 www.ti.com APPLICATION INFORMATION CC SNS VCC VSS COMP BAT TS STAT bq2057 D1 U2 R3 1 k Ω RT2 RT1 TEMP PACK− PACK+ C2 0.1 µF NTC Battery Pack DC+ RSNS 0.2 Ω CMD67− 22SRUC R5 1 k Ω R2 1 k Ω R4 511 Ω C1 0.1 µF Q1 SI6475DQ GND U1 Figure 4. 0.5-A Charger Using P-Channel MOSFET current regulation phase The bq2057 regulates current while the battery-pack voltage is less than the regulation voltage, VO(REG). The bq2057 monitors charge current at the SNS input by the voltage drop across a sense-resistor, RSNS, in series with the battery pack. In high-side current sensing configuration (Figure 5), RSNS is between the VCC and SNS pins, and in low-side sensing (Figure 6) the RSNS is between VSS (battery negative) and SNS (charger ground) 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: R SNS + V (SNS) I O(REG) Where IO(REG) is the desired charging current. (1) |
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