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SCY99080CDWR2G Datasheet(PDF) 17 Page - ON Semiconductor |
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SCY99080CDWR2G Datasheet(HTML) 17 Page - ON Semiconductor |
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17 / 27 page  DDA002C http://onsemi.com 17 Fmin Fmax 5.1 6 Frequency decreases No variations FB fault detection Outputs disabled 1.2 Figure 36. VCO Transfer Characteristic VFB (V) Operating Frequency The output frequency remains at Fmin and the duty cycle is at its maximum value (50% − deadtime) when the FB pin voltage ranges between 5.1 and 6 V. The frequency of the converter varies between Fmin and Fmax values if the feedback voltage changes from 5.1 to 1.2 V. If the feedback voltage further decreases, the operating frequency stays constant and is given by the R_fmax resistor value. The IC disables all drivers once the feedback voltage goes below 1.2 V threshold − skip mode. Please refer also to typical VCO operating waveforms in Figure 37. V_FB 6V 5.1V 1.2V C_DT DT A B C_Dgs SR_A SR_B Variable Fop DT=50% Fixed Fop=Fmin DT=50% Fop = Fmax Ct_T_On FB_Fault Figure 37. VCO Operating Waveforms FB_Fault detected Operation Mode |
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