參數(shù)資料
型號(hào)： NCP5306DW
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 穩(wěn)壓器
英文描述： Three−Phase VRM 9.0 Buck Controller
中文描述： 0.1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24
封裝： SOP-24
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 879K
代理商： NCP5306DW
NCP5306
http://onsemi.com
13
Figure 16. Enhanced V
2
Control Employing Lossless Inductive Current Sensing and Internal Ramp
+
CSA
SWNODE
Lx
R
CSx
RLx
CSx
COx
CS
REF
+
V
OUT
(V
CORE
)
“Fast
Feedback”
Connection
+
PWM
COMP
To F/F
Reset
Channel
Start
Up
Offset
+
E.A.
DAC
Out
V
FB
COMP
Internal Ramp
+
x = 1, 2 or 3
C
CSx
+
C
AMP
Inductive Current Sensing
For lossless sensing, current can be sensed across the
inductor as shown in Figure 16. In the diagram, L is the output
inductance and R
L
is the inherent inductor resistance. To
compensate the current sense signal, the values of R
CSx
and
C
CSx
are chosen so that L/R
L
= R
CSx
C
CSx
. If this criteria
is met, the current sense signal will be the same shape as the
inductor current and the voltage signal at CSx will represent
the instantaneous value of inductor current. Also, the circuit
can be analyzed as if a sense resistor of value R
L
was used.
When choosing or designing inductors for use with
inductive sensing, tolerances and temperature effects should
be considered. Cores with a low permeability material or a
large gap will usually have minimal inductance change with
temperature and load. Copper magnet wire has a
temperature coefficient of 0.39% per
°
C. The increase in
winding resistance at higher temperatures should be
considered when setting the OCSET threshold. If a more
accurate current sense is required than inductive sensing can
provide, current can be sensed through a resistor as shown
in Figure 14.
Current Sharing Accuracy
Printed circuit board (PCB) traces that carry inductor
current can be used as part of the current sense resistance
depending on where the current sense signal is picked off.
For accurate current sharing, the current sense inputs should
sense the current at relatively the same point for each phase
and the connection to the CS
REF
pin should be made so that
no phase is favored. In some cases, especially with inductive
sensing, resistance of the PCB can be useful for increasing
the current sense resistance. The total current sense
resistance used for calculations must include any PCB trace
resistance between the CSx input and the CS
REF
input that
carries inductor current.
Current Sense Amplifier (CSA) input mismatch and the
value of the current sense component will determine the
accuracy of the current sharing between phases. The worst
case CSA input mismatch is
±
10 mV and will typically be
within 4.0 mV. The difference in peak currents between
phases will be the CSA input mismatch divided by the
current sense resistance. If all current sense components are
of equal resistance, a 3.0 mV mismatch with a 2.0 m
Ω
sense
resistance will produce a 1.5 A difference in current between
phases.
External Ramp Size and Current Sensing
The internal ramp allows flexibility in setting the current
sense time constant. Typically, the current sense R
CSx
C
CSx
time constant should be equal to or slightly slower than the
inductor’s time constant. If RC is chosen to be smaller
(faster) than L/R
L
, the AC or transient portion of the current
sensing signal will be scaled larger than the DC portion. This
will provide a larger steady
state ramp, but circuit
performance will be affected and must be evaluated
carefully. The current signal will overshoot during transients
and settle at the rate determined by R
CSx
C
CSx
. It will
eventually settle to the correct DC level, but the error will
decay with the time constant of R
CSx
C
CSx
. If this error is
excessive, it will affect transient response, adaptive
positioning and current limit. During a positive current
transient, the COMP pin will be required to undershoot in
response to the current signal in order to maintain the output
voltage. Similarly, the V
DRP
signal will overshoot which
will produce too much transient droop in the output voltage.
The single
phase pulse
by
pulse overcurrent protection
will trip earlier than it would if compensated correctly and
hiccup
mode current limit will have a lower threshold for
fast rising step loads than for slowly rising output currents.
The waveforms in Figure 17 show a simulation of the
current sense signal and the actual inductor current during a
positive step in load current with values of L = 500 nH, R
L
= 1.6 m
Ω
, R
CSx
= 20 k
Ω
and C
CSx
= .01
μ
F. In this case, ideal
current signal compensation would require R
CSx
to be 31 k
Ω
.
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