參數(shù)資料
型號: NCP5314FTR2G
廠商: ON SEMICONDUCTOR
元件分類: 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
文件頁數(shù): 23/29頁
文件大?。?/td> 684K
代理商: NCP5314FTR2G
NCP5314
http://onsemi.com
23
below 30 k
Ω
. As load current increases, the voltage at the
V
DRP
pin rises. The ratio of the R
DRP
and R
FB
resistors
causes the voltage at the V
FB
pin to rise, reducing the output
voltage. Figure 29 shows the DC effect of AVP, given an
appropriate resistor ratio.
To choose components, recall that the two resistors R
FB
and R
DRP
form a voltage divider. Select the appropriate
resistor ratio to achieve the desired loadline. At no load, the
output voltage is positioned 20 mV below the DAC output
setting.
The output voltage droop will follow the equation:
RDRP
g
RL
RFB
RLL
(29)
where:
g = current sense amplifier to V
DRP
gain (V/V);
R
L
= ESR of Lo inductor (m
Ω
);
R
LL
= load line resistance (m
Ω
).
+
+
G
VDRP
Σ
R
CS1
CS1P
C
CS1
L1
0 A
+
G
VDRP
R
CSx
CSxP
C
CSx
Lx
0 A
COMP
Error
Amp
VID 20 mV
R
DRP
R
FB
V
DRP
= VID
V
FB
= VID 20 mV
V
CORE
I
DRP
= 0
I
FB
= 0
V
CORE
= VID + IBIAS
VFB
R
FB
Figure 27. AVP Circuitry at NoLoad
+
CS1N
CSxN
+
+
G
VDRP
Σ
R
CS1
CS1P
C
CS1
L1
I
MAX
/2
+
G
VDRP
R
CSx
CSxP
C
CSx
Lx
I
MAX
/n
COMP
Error
Amp
VID 20 mV
R
DRP
R
FB
V
DRP
= VID +
I
MAX
R
L
G
VDRP
V
FB
= VID 20 mV V
CORE
I
DRP
I
FB
V
CORE
= VID I
DRP
R
FB
= VID I
MAX
R
L
G
VDRP
R
FB
/R
DRP
Figure 28. AVP Circuitry at FullLoad
I
DRP
= I
MAX
R
L
G
VDRP
/R
DRP
I
FBK
= I
DRP
+
CS1N
CSxN
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