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What is the difference/practical consequence of using switched vs. linear charger controlling ICs and which one should I choose?

I understand that the switched regulators/chargers use a PWM while the linear ones use an adjustable voltage divider.

But how does that map on the practice? I need to charge a lead-acid (Yuasa 6V 1.2Ah) battery from the solar battery and I choose between TI's linear UC2906 and a switched UC2909.

Ricardo
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eltomek
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1 Answers1

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Linear regulators waste power because it is like using a variable resistor to control the charging current. Whatever current flows into the battery also flows thru the resistor and this generates heat.

A switcher wastes very little heat normally and could be more than 95% efficient. Very useful for limited power output from a solar cell.

Andy aka
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