Fish & Richardson P.C.
Switching current control circuit, LED dimmer system, and LED illumination device
The switching current control circuit includes a switching pulse supply circuit, a comparator circuit, and analog circuit unit, a digital circuit unit, etc. The A/D converter (2) detects a load current in an ON period of a switching pulse as a detected current, and converts it into digital data. The arithmetic control circuit (3) calculates a lower limit of the detected current for providing a timing of switching from OFF to ON of the switching pulse, based on the converted data. Continuation/discontinuous modes are determined whether the lower limit is equal to or greater than 0.
Rohm Co., Ltd.
Y H H H H
Y02B H05B H05B H03K H05B
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Akinobu
Sawada