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CS5150HGD16 データシート(PDF) 9 Page - ON Semiconductor

部品番号 CS5150HGD16
部品情報  CPU 4?묪it Synchronous Buck Controller
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5150HGD16 データシート(HTML) 9 Page - ON Semiconductor

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CS5150H
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Figure 8. 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 CS5150H 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.
Overall load transient response is further improved
through a feature called “adaptive voltage positioning”. This
technique pre−positions the output capacitor’s voltage to
reduce total output voltage excursions during changes in
load.
Holding tolerance to 1.0% allows the error amplifier’s
reference voltage to be targeted +40 mV high without
compromising DC accuracy. A “droop resistor”,
implemented through a PC board trace, connects the error
amplifier’s feedback pin (VFB) to the output capacitors and
load and carries the output current. With no load, there is no
DC drop across this resistor, producing an output voltage
tracking the error amplifier’s, including the +40 mV offset.
When the full load current is delivered, an 80 mV drop is
developed across this resistor. This results in output voltage
being offset −40 mV low.
The result of adaptive voltage positioning is that
additional margin is provided for a load transient before
reaching the output voltage specification limits. When load
current suddenly increases from its minimum level, the
output capacitor is pre−positioned +40 mV. Conversely,
when load current suddenly decreases from its maximum
level, the output capacitor is pre−positioned −40 mV (see
Figures 9, 10, and 11). 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. CS5150H Demonstration Board Response
to a 0.5 to 13 A Load Pulse (Output Set for 2.8 V)
Trace 2− Regulator Output Voltage (20 V/div.)
Trace 1− Regulator Output Voltage (1.0 V/div.)
Figure 10. CS5150H 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 (1.0 V/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)
Trace 3− Output Current (0.5 to 13 Amps) (20 V/div.)


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