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Application Report
SNOA327B–May 1994–Revised April 2013
AN-946 High-Efficiency 3A Battery Chargers Use
LM2576 Regulators
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ABSTRACT
This application report describes two LM2576-based designs that provide up to 3A of current for battery
charging.
Contents
1 3A Battery Charger Has Built-In Overcharge Protection ............................................................... 2
1.1 Circuit Concept ..................................................................................................... 2
1.2 Overcharging: the Silent Killer .................................................................................... 2
1.3 Detecting End-of-Charge .......................................................................................... 2
1.4 Warnings About Fast Charging Ni-MH and Ni-Cd Batteries ................................................. 4
1.5 Trickle Charge Current ............................................................................................ 4
1.6 Details of Circuit Function ......................................................................................... 5
1.7 Automatic Shutdown at Full Charge ............................................................................. 5
1.8 Controlling the Fast-Charge Current Source ................................................................... 5
1.9 Detecting an End-of-Charge Condition .......................................................................... 6
2 3A Battery Charger has Logic-Level Current Controls ................................................................. 6
2.1 General Description ................................................................................................ 6
2.2 Circuit Operation ................................................................................................... 7
List of Figures
1 3A Charger with Overcharge Protection ................................................................................. 3
2 Battery Charger with Logic-Level Current Controls .................................................................... 8
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SNOA327B–May 1994–Revised April 2013 AN-946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators
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