Application Note AN0017 Device: ICS1700A, ICS1702, ICS1708, ICS17
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Application Note AN0017
Device: ICS1700A, ICS1702, ICS1708, ICS1712, ICS1718, ICS1722
Description: Simple Switcher Charger Approach NiMH/NiCd Batteries
following approach involves using current sense resistor between battery negative input ground. dropped across with desired average charge current flowing. half LM358 used amplify drop across 1.25V. same voltage across drops 1.23V minus voltage across based 100uF Amp. minimum, selected absorb energy kick from battery removal. .5LI .5CV where peak current additional voltage rise stores energy from must either schottky fast recovery diode; general purpose diode. should carry more that their rated current. adjustable regulator selected provide required charging current. applications requiring 0.4A, 0.5A, 52KHz such LM2574, made several manufacturers. reduce size 0.5A, 200KHz Micrel LM4574 other manufacturer's high frequency version) considered. applicatons requiring 0.8A, 52KHz such LM2575, made several manufacturers. reduce size 1.0A, 200KHz Micrel LM4575 other manufacturer's high frequency version) considered. applications requiring 2.5A, 52KHz such LM2576, made several manufacturers. reduce size 3.0A, 200KHz Micrel LM4576 other manufacturer's high frequency version) considered.
Rev:10/05/01
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