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RT8004QCP Datasheet(PDF) 5 Page - Richtek Technology Corporation |
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RT8004QCP Datasheet(HTML) 5 Page - Richtek Technology Corporation |
5 / 16 page RT8004 5 DS8004-03 September 2007 www.richtek.com Dropout Operation When the input supply voltage decreases toward the output voltage, the duty cycle increases toward the maximum on- time. Further reduction of the supply voltage forces the main switch to remain on for more than one cycle eventually reaching 100% duty cycle. The output voltage will then be determined by the input voltage minus the voltage drop across the internal P-Channel MOSFET and the inductor. Low Supply Operation The RT8004 is designed to operate down to an input supply voltage of 2.65V. One important consideration at low input supply voltages is that the RDS(ON) of the P-Channel and N-Channel power switches increases. The user should calculate the power dissipation when the RT8004 is used at 100% duty cycle with low input voltages to ensure that thermal limits are not exceeded. Slope Compensation and Inductor Peak Current Slope compensation provides stability in constant frequency architectures by preventing subharmonic oscillations at duty cycles greater than 50%. It is accomplished internally by adding a compensating ramp to the inductor current signal. Normally, the maximum inductor peak current is reduced when slope compensation is added. In the RT8004, however, separated inductor current signals are used to monitor over current condition and minimum peak current. This keeps the maximum output current and minimum peak current relatively constant regardless of duty cycle. Short-Circuit Protection When the output is shorted to ground, the inductor current decays very slowly during a single switching cycle. A current runaway detector is used to monitor inductor current. As current increasing beyond the control of current loop, switching cycles will be skipped to prevent current runaway from occurring. |
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