Switching regulator charges NiMH batteries

Posted on Apr 29, 2012

In Figure 1, an MC34063A switching regulator and an MC33342 NiMH battery-charger IC combine to generate from an unregulated power supply a 600-mA battery charger for one to four NiMH cells.

Using some tricks with the current limit and the feedback network, you can make a simple dc/dc converter into a programmable current source for NiMH charging. IC1 operates in continuous mode in the buck converter without the output capacitor. The eliminat

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