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CS5161GD16 Datasheet(PDF) 10 Page - ON Semiconductor |
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CS5161GD16 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 18 page CS5161, CS5161H http://onsemi.com 10 Figure 8. CS5161/5161H 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 CS5161/5161H 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. 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. CS5161/5161H Pentium® III Converter Output Voltage Response to a 12 A Load Pulse. 100 μs/div. Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.) Figure 10. CS5161/5161H Pentium® III Converter Output Voltage Response to a 0 to 12 A Load Increase 10 μs/div. Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.) Trace 1− Inductor Switching Node (5.0 V/div.) Figure 11. CS5161/5161H Pentium® III Converter Output Voltage Response to a 12 to 0 A Load Decrease 10 μs/div. Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.) Trace 1− Inductor Switching Node (5 V/div.) PROTECTION AND MONITORING FEATURES VCC1 Monitor To maintain predictable startup and shutdown characteristics an internal VCC1 monitor circuit is used to prevent the part from operating below 8.70 V minimum startup. The VCC1 monitor comparator provides hysteresis and guarantees a 8.55 V minimum shutdown threshold. Short Circuit Protection A lossless hiccup mode short circuit protection feature is provided, requiring only the Soft Start capacitor to implement. If a short circuit condition occurs (VFFB < 1.0 V), the VFFB low comparator sets the FAULT |
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