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Therefore, most applications simply use a fixed bias voltage and ballast resistors, as seen in Figure 1.
It is appropriate for driving LEDs in parallel, using ballast resistors to set the current, in LCD backlighting and color indicator applications.
These devices use ion implanted polysilicon ballast resistors for maximum resistance to current induced hot spot failures.
The drivers are suitable for a broad range of high-brightness, general illumination applications, including signage, architectural, emergency lighting and MR16 lamp replacement, ensuring uniform LED brightness as well as eliminate the need for ballast resistors.
The SiP12401 boost controller IC uses double-cell NiMH or alkaline and Li-ion batteries to drive white LEDs connected in series for uniformly bright backlighting without the need for ballast resistors.
It provides a solution to drive LEDs in parallel, using ballast resistors to set the current, in LCD backlighting and color indicator applications.