參數(shù)資料
型號(hào): NCP5314FTR2G
廠(chǎng)商: ON SEMICONDUCTOR
元件分類(lèi): 穩(wěn)壓器
英文描述: Two/Three/Four−Phase Buck CPU Controller
中文描述: SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQFP32
封裝: LEAD FREE, LQFP-32
文件頁(yè)數(shù): 24/29頁(yè)
文件大?。?/td> 684K
代理商: NCP5314FTR2G
NCP5314
http://onsemi.com
24
0.14
0.06
0.02
0
V
O
0
I
OUT
(A)
10
60
0.04
0.08
0.10
0.12
20
30
40
50
VID V
OUT
Spec Min
Spec Max
Figure 29. The DC Effects of AVP vs. Load
It is easiest to select a value for R
FB
and then evaluate the
equation to find R
DRP
. R
LL
is simply the desired output
voltage droop divided by the output current. If inductor
sensing is used, R
L
will be the resistance of the inductor,
assuming that the current sense network equation (eq. 30) is
valid. Refer to the discussion on Current Sensing for further
information.
8. Current Sensing
Current sensing is used to balance current between
different phases, to limit the maximum phase current and to
limit the maximum system current. Since the current
information, sensed across the inductor, is a part of the
control loop, better stability is achieved if the current
information is accurate and noisefree. The NCP5314
introduces a novel feature to achieve the best possible
performance: differential current sense amplifiers.
Two sense lines are routed for each phase, as shown in
Figure 28.
For inductive current sensing, choose the current sense
network (R
CSx
, C
CSx
, x = 1, 2, 3 or 4) to satisfy
RCSx
CCSx
Lo (RL
This will provide an adequate starting point for R
CSx
and
C
CSx
. After the converter is constructed, the value of R
CSx
(and/or C
CSx
) should be finetuned in the lab by observing
the V
DRP
signal during a step change in load current. Tune
the R
CSx
C
CSx
network by varying R
CSx
to provide a
“squarewave” at the V
DRP
output pin with maximum rise
time and minimal overshoot as shown in Figure 32.
RPCB)
(30)
Figure 30. V
DRP
Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Too Long
(Slow): V
DRP
and V
OUT
Respond Too Slowly.
Figure 31. V
DRP
Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Too Short
(Fast): V
DRP
and V
OUT
Both Overshoot.
Figure 32. V
DRP
Tuning Waveforms. The RC Time
Constant of the Current Sense Network Is Optimal:
V
DRP
and V
OUT
Respond to the Load Current Quickly
Without Overshooting.
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