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CS5157HGDR16 데이터시트(PDF) 9 Page - ON Semiconductor

부품명 CS5157HGDR16
상세설명  CPU 5?묪it Synchronous Buck Controller
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5157HGDR16 데이터시트(HTML) 9 Page - ON Semiconductor

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CS5157H
http://onsemi.com
9
Figure 8. Peak−to−Peak Ripple on VOUT = 2.8 V,
IOUT = 13 A (Heavy Load)
M 1.00
ms
Trace 1− Regulator Output Voltage (10 mV/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)
Transient Response
The CS5157H 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. CS5157H Demonstration Board Response
to a 0.5 to 13 A Load Pulse (Output Set for 2.8 V)
Trace 2− Regulator Output Voltage (10 A/div.)
Trace 1− Regulator Output Voltage (100 mV/div.)
Figure 10. CS5157H Demonstration Board Response to
13 A Load Turn On (Output Set for 2.8 V). Upon
Completing a Normal Off Time, The V2 Control Loop
Immediately Connects the Inductor to the Input
Voltage, Providing 100% Duty Cycle. Regulation is
Achieved in Less Than 20
ms
Trace 1− Regulator Output Voltage (100 mV/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)
Trace 3− Output Current (0.5 to 13 Amps) (10 A/div.)
Figure 11. CS5157H Demonstration Board Response to
13 A Load Turn Off (Output Set for 2.8 V). V2 Control
Topology Immediately Connects Inductor to Ground,
Providing 0% Duty Cycle. Regulation is Achieved in
Less Than 10
ms
Trace 3− Output Current (13 to 0,5 Amps) (10 A/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)
Trace 1− Regulator Output Voltage (100 mV/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 3.75 V minimum
startup. The VCC1 monitor comparator provides hysteresis
and guarantees a 3.70 V minimum shutdown threshold.


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