A new type of LED constant current driving is proposed and designed in this paper, which controls the output current by receiving digital dimming signals. The output LED current can be accurately controlled with MOS transistors in the current mirror structure turned on and off. With a reference current of 10 uA, the dimmed output current range of the LED is 30 uA ∼ 270 uA. In a typical environment of 5 V and 27 °C, the phase margin and loop gain of the current reference generator amplifier are 62.5 deg and 114.75 dB, respectively, guaranteeing stable reference current and output LED current. At the same time, when the output current of the LED is a maximum of 270 uA, the channel has a fast-switching speed of 202.25 ns.
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Jia et al. (2024) studied this question.
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