National Application Note AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators
Zetex Application Note AN2 Portable Ni-Cd battery charger - inexpensive load tolerant step-up energy source.
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AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators AN2 Portable Ni-Cd battery charger - inexpensive load tolerant step-up energy source. 
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