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BQ2057TTS Datasheet(PDF) 9 Page - Texas Instruments |
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BQ2057TTS Datasheet(HTML) 9 Page - Texas Instruments |
9 / 30 page bq2057, bq2057C bq2057T, bq2057W SLUS025F − MAY 2001 − REVISED JULY 2002 9 www.ti.com APPLICATION INFORMATION Preconditioning Phase Current Regulation Phase Voltage Regulation and Charge Termination Phase Regulation Voltage Regulation Current Minimum Charge Voltage Preconditioning and Taper Detect Figure 3. Typical Charge Profile qualification and precharge When power is applied, the bq2057 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 bq2057 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 bq2057 also checks the battery voltage. If the battery voltage is below the precharge threshold V(min), the bq2057 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 Figure 3 for a typical charge-profile. |
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