Transcription of Battery Charging - Texas Instruments
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Battery Charging - Texas Instruments
LM2576,LM3420,LP2951,LP2952 Battery ChargingLiterature Number: SNVA557 Battery CHARGINGI ntroductionThe circuitry to recharge the batteries in a portable product is an important part of anypower supply design. The complexity (and cost) of the Charging system is primarilydependent on the type of Battery and the recharge chapter will present Charging methods, end-of-charge-detection techniques, andcharger circuits for use with Nickel-Cadmium (Ni-Cd), Nickel Metal-Hydride (Ni-MH),and Lithium-Ion (Li-Ion) the Ni-Cd and Ni-MH cells are similar in their Charging characteristics, they willbe presented in a combined format, and the Li-Ion information will Charging INFORMATIONIn the realm of Battery Charging , Charging methods are usually separated into two gen-eral categories: Fast charge is typically a system that can recharge a Battery in aboutone or two hours, while slow charge usually refers to an overnight recharge (or longer).
The op-amp amplifies the voltage drop across the 50 mΩ sense resistor (with a gain of 9.2) which locks the loop at the value of charging current that causes the output of the
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