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CS5155HGD16 Datasheet(PDF) 8 Page - Cherry Semiconductor Corporation |
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CS5155HGD16 Datasheet(HTML) 8 Page - Cherry Semiconductor Corporation |
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8 / 14 page  Applications Information: continued 8 Figure 6: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 13A (heavy load). Transient Response The CS5155H V2™ control loop’s 100ns reaction time pro- vides 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% allows the error amplifier’s refer- ence voltage to be targeted +40mV high without compro- mising 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 +40mV offset. When the full load current is delivered, an 80mV drop is developed across this resistor. This results in output volt- age being offset -40mV 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 sud- denly increases from it’s minimum level, the output capaci- tor is pre-positioned +40mV. Conversely, when load cur- rent suddenly decreases from it’s maximum level, the out- put capacitor is pre-positioned -40mV (see Figures 7, 8, and 9). 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 7: CS5155H demonstration board response to a 0.5 to 13A load pulse (output set for 2.8V). Figure 8: CS5155H demonstration board response to 13A load turn on (output set for 2.8V). Upon completing a normal off time, the V2™ con- trol loop immediately connects the inductor to the input voltage, pro- viding 100% duty cycle. Regulation is achieved in less than 20µs. Trace 1 - Regulator Output Voltage (1V/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 3 - Output Current (0.5 to 13 Amps) (20V/div.) Trace 1 - Regulator Output Voltage (1V/div.) Trace 3 - Regulator Output Current (20V/div.) Trace1 - Regulator Output Voltage (10V/div.) Trace 2 - Inductor Switching Node (5V/div.) |
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