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CS5161GDR16 데이터시트(PDF) 9 Page - ON Semiconductor

부품명 CS5161GDR16
상세설명  CPU 5?묪it Synchronous Buck Controller
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5161GDR16 데이터시트(HTML) 9 Page - ON Semiconductor

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CS5161, CS5161H
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capacitor charging to its final value. Its voltage is limited by
the Soft Start COMP clamp and the voltage on the Soft Start
pin (see Figures 4 and 5).
Figure 4. CS5161/5161H 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. CS5161/5161H 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. CS5161/5161H 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. CS5161/5161H 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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