Multichannel constant current LED controlling circuit and controlling method
地域：
Hangzhou, ZheJiang Province
摘要
A multichannel constant current LED controlling circuit can include: (i) a control loop configured to generate a first control signal in accordance with a current feedback signal that represents a driving current flowing through an LED load, where the LED load comprises a plurality of LED strings coupled in series; (ii) a loop steady state network comprising a plurality of steady state holding components configured to hold a plurality of steady state control signals that correspond to a plurality of load states of the LED load, where when a state of the LED load varies, at least one of the steady state holding components is selected by the control loop to generate the first control signal; and (iii) a power switching transistor of a power stage circuit configured to generate a pseudo-constant output current to drive the LED load.
說明書
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When three LED strings are included by the LED load controlled by three corresponding PWM dimming signals, there are total 23=8 load states for multichannel constant current LED controlling circuit 500. Outside of the load state where all of the three LED strings are turned off, each of the remaining seven load states may correspond to one voltage source or filtering capacitor of the loop steady state/compensation network. The value of the voltage sources or filtering capacitors may be determined in accordance with the steady state signal of the remaining seven load states. Based on luminance and color requirements of the LED load, the load states can be all, or a subset of, the total 8 load states.
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