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參數(shù)資料
| 型號(hào)： | NCP5318FTR2 |
| 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, 1000 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數(shù)： | 27/31頁 |
| 文件大?。?/td> | 384K |
| 代理商： | NCP5318FTR2 |
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NCP5318
http://onsemi.com
27
Resistor R
FB
is connected between V
OUT
and the V
FB
pin
of the controller. At no load, this resistor will conduct the
very small internal bias current of the V
FB
pin. Therefore
R
FB
should be kept below 10 k to avoid output voltage
error due to the input bias current. If the R
FB
resistor is kept
small, the V
FB
bias current can be ignored.
Resistor R
DRP
is connected between the V
DRP
and V
FB
pins of the controller. At no load, V
DRP
, V
FB
and V
OUT
are
at the same potential, and no current should flow through
R
DRP
or R
FB
. As load current increases, the voltage at the
V
DRP
pin rises. The the R
DRP
and R
FB
resistors cause the
voltage at V
OUT
to fall in order to keep the voltage at the V
FB
pin close to the reference voltage. Figure 30 shows the
DC effect of AVP.
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
V
OUT
VID
Spec Min
Spec Max
Figure 30. The DC Effects of AVP vs. Load
To choose components, select the appropriate resistor
ratio based on the desired loadline and sense resistor. At no
load, the output voltage is positioned 19 mV below the DAC
output setting. The output voltage droop will follow the
equation:
RDRP
RFB
g
RSENSE
RLL
(eq. 30)
where:
g = gain of the current sense amplifiers (V/V);
R
SENSE
= resistance of the sense element (m );
R
LL
= load line resistance (m ).
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 a sense
resistor is used to detect inductor current, then R
SENSE
will
be the value of the sense resistor. If inductor sensing is used,
R
SENSE
will be the resistance of the inductor. Refer to the
discussion on Current Sensing for further information.
Depending on inductor ESR and the loadline desired,
adding a capacitor on the order of 1 nF in parallel with R
DRP
may improve the transient output voltage waveshape.
Figure 31. Output Voltage
No Capacitor
in Parallel with R
DRP
Figure 32. Output Voltage – 1.2 nF Capacitor
in Parallel with R
DRP
LOAD CURRENT, 60 A/DIV
OUTPUT VOLTAGE, 50 mV/DIV
VDRP VOLTAGE, 200 mV/DIV
5 S/DIV
LOAD CURRENT, 60 A/DIV
OUTPUT VOLTAGE, 50 mV/DIV
VDRP VOLTAGE, 200 mV/DIV
5 S/DIV
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| NCP5318FTR2G | 功能描述:DC/DC 開關(guān)控制器 2/3/4 Phase Buck CPU RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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