Ballast Resistor Calculation – Current Matching in Parallel LEDs
Engineers often need to connect LEDs in parallel. Ideally, the LEDs share current equally. In reality, even LEDs from the same production lot have poorly matched I-V characteristics. This mismatch causes the LEDs to not share the current equally. The engineer can add a ballast resistor in series with each LED to minimize current differences. This application report explains how to size the ballast resistor to minimize differences in the LED currents of paralleled LEDs connected to a current sink.
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