Design a low-cost, high-performance LED driver
Datum:2011-05-24 13:31
hown, the hysteretic current control provides rapid PWM response. In the images, the green represents the output current, while the blue represents the PWM signal. The top image shows 500 us/div, while the bottom image shows 10 us/div.
The circuit of Figure 1 has been built and tested. Figure 2 shows the disable command and the resulting LED current waveform. The LED can easily be PWM dimmed at 500 Hz. Rise time and fall time of the current waveform is less than 100 s. If higher ripple current c
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