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CS5151 датащи(PDF) 8 Page - ON Semiconductor

номер детали CS5151
подробное описание детали  CPU 4?묪it Nonsynchronous Buck Controller
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
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CS5151 датащи(HTML) 8 Page - ON Semiconductor

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8
the Soft Start COMP clamp and the voltage on the Soft Start
pin (see Figures 4 and 5).
Figure 4. CS5151 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 μs
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. CS5151 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. CS5151 Demonstration Board Enable Startup
Waveforms
M 10.0 μs
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 μs
Trace 1− Regulator Output Voltage (10 mV/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)


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