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NCP5230MNTWG Datasheet(PDF) 9 Page - ON Semiconductor

Part # NCP5230MNTWG
Description  Precise Low Voltage Synchronous Buck
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5230MNTWG Datasheet(HTML) 9 Page - ON Semiconductor

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NCP5230
http://onsemi.com
9
L
DCR
RS1
RS2
CS
CSP
CSN/VO
Figure 5. Differential Current Sense Network
Light Load Operation
In the light load condition, NCP5230 will work in a diode
emulation mode with bottom gate turning off if the inductor
current is below zero. The system therefore works in
discontinuous conduction mode (DCM). The zero current
detection is done by sensing switch node and automatically
adjusted to minimize the low side FET body diode
conduction time (right after LG turns off) in diode emulation
mode.
If the load reduces further, COMP signal will be close or
below the internal ramp bottom triggering minimum on time
operation, the system will start skipping pulses, working in
a reduced frequency range. NCP5230 has an internal
ultrasonic timer to keep the device from working in an audio
frequency and below. This timer initiates after high side gate
off signal and expires after ~30
ms.
Normally high side gate signal will reset this ultrasonic
timer repeatedly before it expires. In a very light load or load
release, if there is no high side gate pulses until the timer
expires, the low side MOSFET(s) will be forced to turn on
to discharge the output. Through properly compensated
network the comp signal will climb up to generate next burst
of switching pulses and the converter will regulate the
output voltage to its target level. This can last a few cycles
or continuously depending on the system load level.
In light load operation, if synchronization is enabled,
NCP5230 will also check the SYNC pin input signal cycle
by cycle. If the external sync signal is within the
synchronization frequency range, the NCP5230 will
interleave its switching pulses with it after a proper delay. In
this way, the ripple variation during transition between the
discontinuous and continuous current mode can be
minimized.
Voltage Feedback
The NCP5230 allow the output voltage to be adjusted
from 0.8 V to 5 V via an external resistor divider network
(R1, R2). The controller will regulate the output voltage to
maintain the FB pin voltage to 0.8 V reference voltage. The
relation between the resistor divider network and the output
voltage is as below;
R2 + R1 @
0.8 V
Vout * 0.8 V
VOUT
VFB
R1
R2
Figure 6. Feedback Voltage


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