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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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CS5157H Fiches technique(PDF) 8 Page - Cherry Semiconductor Corporation |
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CS5157H Fiches technique(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 CS5157H V2 TM 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. 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: CS5157H demonstration board response to a 0.5 to 13A load pulse (output set for 2.8V). Figure 8: CS5157H demonstration board response to 13A load turn on (output set for 2.8V). Upon completing a normal off time, the V2 TM con- trol loop immediately connects the inductor to the input voltage, pro- viding 100% duty cycle. Regulation is achieved in less than 20µs. Figure 9: CS5157H demonstration board response to 13A load turn off (output set for 2.8V). V2 TM control topology immediately connects inductor to ground, providing 0% duty cycle. Regulation is achieved in less than 10µs. VCC1 Monitor To maintain predictable startup and shutdown characteris- tics an internal VCC1 monitor circuit is used to prevent the part from operating below 3.75V minimum startup. The VCC1 monitor comparator provides hysteresis and guaran- tees a 3.70V minimum shutdown threshold. Protection and Monitoring Features Trace1 - Regulator Output Voltage (100mV/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 3 - Output Current (13 to 0.5 Amps) (10A/div.) Trace 1 - Regulator Output Voltage (100mV/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 3 - Output Current (0.5 to 13 Amps) (10A/div.) Trace 1 - Regulator Output Voltage (100mV/div.) Trace 3 - Regulator Output Current (10A/div.) Trace1 - Regulator Output Voltage (10mV/div.) Trace 2 - Inductor Switching Node (5V/div.) |
Numéro de pièce similaire - CS5157H |
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Description similaire - CS5157H |
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