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CS5157GDR16 데이터시트(PDF) 8 Page - Cherry Semiconductor Corporation

부품명 CS5157GDR16
상세설명  CPU 5-Bit Synchronous Buck Controller
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제조업체  CHERRY [Cherry Semiconductor Corporation]
홈페이지  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

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Applications Information: continued
8
Figure 6: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 13A (heavy load).
Transient Response
The CS5157 V2
TM control loop’s 100ns reaction time pro-
vides 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 7: CS5157 demonstration board response to a 0.5 to 13A load
pulse (output set for 2.8V).
Figure 8: CS5157 demonstration board response to 13A load turn on
(output set for 2.8V). Upon completing a normal off time, the V2
TM con-
trol loop immediately connects the inductor to the input voltage, pro-
viding 100% duty cycle. Regulation is achieved in less than 20µs.
Figure 9: CS5157 demonstration board response to 13A load turn off
(output set for 2.8V). V2
TM control topology immediately connects
inductor to ground, providing 0% duty cycle. Regulation is achieved in
less than 10µs.
VCC1 Monitor
To maintain predictable startup and shutdown characteris-
tics an internal VCC1 monitor circuit is used to prevent the
part from operating below 3.75V minimum startup. The
VCC1 monitor comparator provides hysteresis and guaran-
tees a 3.70V minimum shutdown threshold.
Protection and Monitoring Features
Trace1 - Regulator Output Voltage (100mV/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Trace 3 - Output Current (13 to 0.5 Amps) (10A/div.)
Trace 1 - Regulator Output Voltage (100mV/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Trace 3 - Output Current (0.5 to 13 Amps) (10A/div.)
Trace 1 - Regulator Output Voltage (100mV/div.)
Trace 3 - Regulator Output Current (10A/div.)
Trace1 - Regulator Output Voltage (10mV/div.)
Trace 2 - Inductor Switching Node (5V/div.)


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