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參數(shù)資料
| 型號： | 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)： | 28/31頁 |
| 文件大?。?/td> | 384K |
| 代理商： | NCP5318FTR2 |
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NCP5318
http://onsemi.com
28
9. 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 is a part of the control loop, better stability is
achieved if the current information is accurate and
noise
free. The NCP5318 uses differential current sense
amplifiers to achieve the best possible performance.
Two sense lines are routed for each phase, as shown in
Figure 29.
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
(eq. 31)
where R
L
is the inductor ESR. 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
fine
tuned in the lab by observing the V
DRP
signal during a
step change in load current. Tune the R
CSx
x C
CSx
network
by varying R
CSx
to provide a “square
wave” at the V
DRP
output pin with maximum rise time and minimal overshoot
as shown in Figure 35.
For resistive current sensing, choose the current sense
network (R
CSx
, C
CSx
, x = 1, 2, 3, or 4) to reject noise spikes,
but maintain the fidelity of the triangular current waveform.
Figure 33. 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 34. V
DRP
tuning waveforms. The RC time
constant of the current sense network is too short
(Fast): V
DRP
and V
OUT
both overshoot.
LOAD CURRENT, 60 A/DIV
OUTPUT VOLTAGE, 50 mV/DIV
VDRP VOLTAGE,
500 mV/DIV
200 S/DIV
VDRP VOLTAGE,
200 mV/DIV
200 S/DIV
LOAD CURRENT, 60 A/DIV
OUTPUT VOLTAGE,
50 mV/DIV
Figure 35. 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.
VDRP VOLTAGE,
200 mV/DIV
200 S/DIV
LOAD CURRENT, 60 A/DIV
OUTPUT VOLTAGE,
50 mV/DIV
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| NCP5322A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC |
| NCP5322A/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two-Phase Buck Controller with integrated Gate Drivers and 5-Bit DAC |
| NCP5322A_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC |
| NCP5322ADW | 功能描述:DC/DC 開關(guān)控制器 2 Phase Buck w/Gate 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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