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CS5156 Datasheet(PDF) 9 Page - ON Semiconductor |
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CS5156 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 17 page CS5156 http://onsemi.com 9 Figure 8. Peak−to−Peak Ripple on VOUT = 2.8 V, IOUT = 13 A (Heavy Load) M 1.00 μs Trace 1− Regulator Output Voltage (10 mV/div.) Trace 2− Inductor Switching Node (5.0 V/div.) Transient Response The CS5156 V2 control loop’s 100 ns reaction time provides unprecedented transient response to changes in input voltage or output current. Pulse by pulse adjustment of duty cycle is provided to quickly ramp the inductor current to the required level. Since the inductor current cannot be changed instantaneously, regulation is maintained by the output capacitor(s) during the time required to slew the inductor current. Overall load transient response is further improved through a feature called “adaptive voltage positioning”. This technique pre−positions the output capacitor’s voltage to reduce total output voltage excursions during changes in load. Holding tolerance to 1.0% allows the error amplifier’s reference voltage to be targeted +40 mV high without compromising DC accuracy. A “droop resistor”, implemented through a PC board trace, connects the error amplifier’s feedback pin (VFB) to the output capacitors and load and carries the output current. With no load, there is no DC drop across this resistor, producing an output voltage tracking the error amplifier’s, including the +40 mV offset. When the full load current is delivered, an 80 mV drop is developed across this resistor. This results in output voltage being offset −40 mV low. The result of adaptive voltage positioning is that additional margin is provided for a load transient before reaching the output voltage specification limits. When load current suddenly increases from its minimum level, the output capacitor is pre−positioned +40 mV. Conversely, when load current suddenly decreases from its maximum level, the output capacitor is pre−positioned −40 mV (see Figures 9, 10, and 11). For best transient response, a combination of a number of high frequency and bulk output capacitors are usually used. If the maximum on time is exceeded while responding to a sudden increase in load current, a normal off time occurs to prevent saturation of the output inductor. Figure 9. CS5156 Demonstration Board Response to a 0.5 to 13 A Load Pulse (Output Set for 2.8 V) Trace 2− Regulator Output Voltage (20 V/div.) Trace 1− Regulator Output Voltage (1.0 V/div.) Figure 10. CS5156 Demonstration Board Response to 13 A Load Turn On (Output Set for 2.8 V). Upon Completing a Normal Off Time, The V2 Control Loop Immediately Connects the Inductor to the Input Voltage, Providing 100% Duty Cycle. Regulation is Achieved in Less Than 20 ms Trace 1− Regulator Output Voltage (1.0 V/div.) Trace 2− Inductor Switching Node (5.0 V/div.) Trace 3− Output Current (0.5 to 13 Amps) (20 V/div.) |
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