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LM3655 Fiches technique(PDF) 7 Page - National Semiconductor (TI) |
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LM3655 Fiches technique(HTML) 7 Page - National Semiconductor (TI) |
7 / 21 page 11.0 Charge Control Functions (Continued) The Shunt Regulator (Z1) on the V DETECT pin is designed to sink a limited amount of current while maintaining certain levels of regulation. These are specified below. When there is excessive current flowing into the V DETECT pin above which Z1 can regulate, then current can flow through D1 into the cell pin. When the cell pin voltage exceeds V SHUNT,ICELL_SHUNT turns on. The I CELL_SHUNT circuit is implemented redundantly. ICELL_SHUNT shunts current to ground through effectively 100 Ω when both redundant circuits are operating. V DETECT circuit parametric specs are summarized below. These specs apply to the entire Normal Temperature Range. Parameter Description Min Typ Max Units I DETECTMIN1 Min V DETECT pin current to allow detection of a charger 100 µA I UNDETECTMAX Maximum current into the V DETECT pin for the charger to be not detected. 3µA I DETECTMIN2 Once a charger is detected, it will remain detected unless the current into the V DETECT pin goes below this threshold 25 µA I CELL_SHUNT V CELL current. With V CELL = 4.5V (> VSHUNT) 20 75 mA I DETECTMAX Max V DETECT pin current that can maintain VDETECTMAX1 15 mA V DETECTMAX1 Normal V DETECT regulation voltage, IDETECTMIN < IDETECT < I DETECTMAX V CELL –5 mV V CELL ± 50 mV V V DETECTMAX2 Secondary V DETECT voltage limit, IDETECTMAX < IDETECT < 30 mA V CELL 1V V 11.2.2 Debounce Function The charger debounce detects a temporary disconnect/connect of the charging power supply. This can occur when the end-user inserts the power supply to the phone and the connection is not made cleanly, or if the connection is disturbed (such as dropping the phone). When the IC first senses the power supply input voltage it will delay τ DEBOUNCE_ON before the charger detect signal is confirmed. If there is disconnect of the charge power supply, the IC will delay τ DEBOUNCE_OFF before the disconnection is confirmed. The IC will ignore the interruptions of duration shorter than specified. These specs apply to the entire Normal Temperature Range. 20111505 FIGURE 2. V DETECT Circuit www.national.com 7 |
Numéro de pièce similaire - LM3655 |
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Description similaire - LM3655 |
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