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CS5160 Datasheet(PDF) 9 Page - ON Semiconductor

Part No. CS5160
Description  CPU 5−Bit Synchronous Buck Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5160 Datasheet(HTML) 9 Page - ON Semiconductor

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CS5160
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9
the Soft Start COMP clamp and the voltage on the Soft Start
pin (see Figures 4 and 5).
Figure 4. CS5160 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. CS5160 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. CS5160 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. CS5160 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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