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CS5161GD16 Datasheet(PDF) 10 Page - ON Semiconductor

No. de pieza CS5161GD16
Descripción Electrónicos  CPU 5?묪it Synchronous Buck Controller
Download  18 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5161GD16 Datasheet(HTML) 10 Page - ON Semiconductor

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CS5161, CS5161H
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Figure 8. CS5161/5161H Peak−to−Peak Ripple on
VOUT = 2.8 V, IOUT = 13 A (Heavy Load)
M 1.00 μs
Trace 1− Regulator Output Voltage (10 mV/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)
Transient Response
The CS5161/5161H 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. CS5161/5161H Pentium® III Converter
Output Voltage Response to a 12 A Load Pulse.
100 μs/div.
Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.)
Figure 10. CS5161/5161H Pentium® III Converter
Output Voltage Response to a 0 to 12 A Load Increase
10 μs/div.
Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.)
Trace 1− Inductor Switching Node (5.0 V/div.)
Figure 11. CS5161/5161H Pentium® III Converter Output
Voltage Response to a 12 to 0 A Load Decrease
10 μs/div.
Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.)
Trace 1− Inductor Switching Node (5 V/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 8.70 V minimum
startup. The VCC1 monitor comparator provides hysteresis
and guarantees a 8.55 V minimum shutdown threshold.
Short Circuit Protection
A lossless hiccup mode short circuit protection feature is
provided, requiring only the Soft Start capacitor to
implement. If a short circuit condition occurs
(VFFB < 1.0 V), the VFFB low comparator sets the FAULT


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