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CS5157HGDR16 데이터시트(PDF) 8 Page - ON Semiconductor |
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CS5157HGDR16 데이터시트(HTML) 8 Page - ON Semiconductor |
8 / 16 page CS5157H http://onsemi.com 8 Figure 4. CS5157H Demonstration Board Startup in Response to Increasing 12 V and 5.0 V Input Voltages. Extended Off Time is Followed by Normal Off Time Operation when Output Voltage Achieves Regulation to the Error Amplifier Output. M 250 ms Trace 3− 12 V Input (VCC1 and VCC2) (5.0 V/div.) Trace 1− Regulator Output Voltage (1.0 V/div.) Trace 4− 5.0 V Input (1.0 V/div.) Trace 2− Inductor Switching Node (2.0 V/div.) Figure 5. CS5157H Demonstration Board Startup Waveforms M 2.50 ms Trace 3− COMP PIn (error amplifier output) (1.0 V/div.) Trace 1− Regulator Output Voltage (1.0 V/div.) Trace 4− Soft−Start Pin (2.0 V/div.) If the input voltage rises quickly, or the regulator output is enabled externally, output voltage will increase to the level set by the error amplifier output more rapidly, usually within a couple of cycles (see Figure 6). Figure 6. CS5157H Demonstration Board Enable Startup Waveforms M 10.0 ms Trace 1− Regulator Output Voltage (5.0 V/div.) Trace 2− Inductor Switching Node (5.0 V/div.) Normal Operation During normal operation, switch off time is constant and set by the COFF capacitor. Switch on time is adjusted by the V2 control loop to maintain regulation. This results in changes in regulator switching frequency, duty cycle, and output ripple in response to changes in load and line. Output voltage ripple will be determined by inductor ripple current working into the ESR of the output capacitors (see Figures 7 and 8). Figure 7. Peak−to−Peak Ripple on VOUT = 2.8 V, IOUT = 0.5 A (Light Load) M 1.00 ms Trace 1− Regulator Output Voltage (10 mV/div.) Trace 2− Inductor Switching Node (5.0 V/div.) |
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