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BQ24901 Datasheet(PDF) 11 Page - Texas Instruments |
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BQ24901 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 18 page bq24901 SLUS527 – DECEMBER 2002 11 www.ti.com APPLICATION INFORMATION Current Regulation Ramp-Up and Ramp-Down Both current regulation loops ramp up and down when transitioning from pre-charge to fast charge, and when going in and out of fault/suspend mode where the LDO needs to be turned hard on or off. Figure 5 demonstrates the typical stepping ramp. 0 0 300 150 10 20 50 200 250 50 25 75 100 125 225 275 30 40 60 70 515 25 35 45 55 65 75 13 5 11 7 9 13 15 2 4 6 8 10 12 14 tCHG – Time – ms Step Count Pre-Charge Regulator Reference Pre-Charge Fastcharge Fastcharge Regulator Reference Figure 5. Typical Current Regulation Ramp From/To Pre-Charge/Fastcharge |
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