Design a low-cost, high-performance LED driver
Datum:2011-05-24 13:31
ial, requiring a large percentage change in current for full dimming. This has a profound impact on the circuit design as a 3% regulation error at full current can become a 30% or more error at 10% load due to circuit tolerances. Dimming current waveform through PWM is more accurate, although the response speed becomes an issue. In lighting and displays, its desirable to PWM above 100 Hz so the human eye doesnt perceive flicker.
Figure 1 shows a very simple, low-cost, buck regulator driving a si
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