Fig. 1. Constant-frequency buck derived AC/DC LED driver.
Fig. 2. Input voltage and inductor current waveforms of Fig. 1.
Fig. 3. Operating modes of inductor current. (a) CCM1, (b) DCM1, (c) CCM2, (d) DCM2.
Fig. 4. Analytical current waveforms when Vm = 310 V, fL = 60 Hz, Vo = 70 V, LED current = 0.6 A, Sro = 7, L = 1.5 mH, and fs = 100 kHz. (a) inductor current, (b) input current.
Fig. 5. Slope ratio Sro versus PF when fL = 60 Hz, Vo =70 V, LED current =0.6 A, L = 1.5 mH, and fs = 100 kHz.
Fig. 6. Experimental circuit (a) and Control IC (b).
Fig. 7. External ramp signal OSC of CS3842 in the experiment.
Fig. 8. Experimental input current waveforms as a function of the input voltage, (a) Vm/
Fig. 9. Input voltage versus PF for Sro = 7.
Fig. 10. Input voltage versus measured efficiency (Vo ≈ 70 V, Po ≈ 42 W).
Fig. 11. Start-up transient response.
TABLE I COMPONENTS AND PARAMETERS OF PROTOTYPE CONVERTER
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