參數(shù)資料
型號(hào)： NCP5318FTR2
廠商： 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, 1000 kHz SWITCHING FREQ-MAX, PQFP32
封裝： LQFP-32
文件頁(yè)數(shù)： 14/31頁(yè)
文件大小： 384K
代理商： NCP5318FTR2
NCP5318
http://onsemi.com
14
APPLICATIONS INFORMATION
Overview
The NCP5318 is a multiphase, synchronous buck
controller using the Enhanced V
2
topology which combines
the fast transient response of the original V
2
topology with
the load current sharing characteristic of peak current
mode
control. The NCP5318 can be operated as an interleaved
two/three/four
phase controller. Differential current
sensing is incorporated in order to more easily achieve
effective current sharing. Converter output is regulated to a
voltage corresponding to the logic states at six digital inputs.
The NCP5318 incorporates a Power Good (PWRGD)
function, providing integrated fault monitoring and
sequencing that simplifies design, minimizes circuit board
area, and reduces overall system cost.
Fixed Frequency Multi
Phase Control
In a multi
phase buck converter, multiple, synchronously
rectified, buck power stages are connected in parallel and are
energized at a common frequency but with staggered
phasing (interleaving). Each stage carries only part of the
total output current. In four
phase mode, each phase
oscillator is delayed 360/4
or 90
degrees from that of the
previous phase. Likewise, for other phase counts, each phase
oscillator is delayed 360/N degrees from that of the previous
phase, where N is the number of phases.
Advantages of a multiphase converter over a single
phase
converter include a better heat distribution and decreased
input and output ripple currents. Breaking up heat into a
greater number of smaller amounts, reduces PC Board
thermal stress. Multiple phases also permits phase
inductance to be higher than used in a single
phase
converter capable of equal transient response, with
correspondingly lower phase ripple current and I
2
R losses.
In addition to the higher efficiency, input capacitor current
appears even lower because of the cancellation achieved by
the summation of individual, phase shifted, ripple currents.
This often allows the use of fewer input capacitors without
exceeding the capacitor RMS current rating. Also due to the
decrease in phase ripple current, output di/dt change from
positive to negative during switching is reduced. This
reduction of output di/dt change decreases the output
capacitor ESL component of output ripple voltage
often
allowing a reduction in the number of ceramic output
capacitors.
Because the inductors are always connected between the
output and some low impedance (either the input supply or
ground), the effective inductance value seen at the output is
the value of all inductors connected in parallel (the value of
a single inductor divided by the number of phases).
Multiphase output current ramp
up (+di/dt) or ramp
down
(
di/dt) exhibits finer granularity due to the summation of
the smaller individual phase di/dt produced by the larger
individual inductors. Within one switching cycle, however,
total converter di/dt can sum to the same di/dt as a power
stage with a single inductor of the same effective value.
Enhanced V
2
Control
Enhanced V
2
control measures and adjusts the output
current in each phase while simultaneously adjusting the
current of all phases to maintain the correct output voltage.
Enhanced V
2
responds to output voltage disturbances by the
combined effect of two mechanisms. The first mechanism
includes the response of the Error Amplifier, and is
responsible for maintaining the DC accuracy of the output
voltage setting. Depending on the frequency compensation
set by the amplifier’s external components, the Error
Amplifier response begins to change the PWM duty cycle
within one to two cycles. The second mechanism is the direct
coupling of converter output voltage to all non
inverting
PWM comparator inputs, which dominates PWM response
at frequencies above the unity
gain crossover frequency of
the compensated Error Amplifier. A rapid increase in load
current that decreases converter output voltage immediately
extends the duty cycle of any phase already on, and will
typically increase the duty cycle of several of the following
phases for one cycle.
Figure 17. Enhanced V
2
Control Employing Resistive Current Sensing and Internal Ramp
+
CSA
SWNODE
Lx
RLx
RSx
CSxP
COx
CSxN
+
V
OUT
(V
CORE
)
“Fast
Feedback”
Connection
+
PWM
COMP
To PWM Latch Reset
Channel
Startup
Offset
+
E.A.
DAC
Out
V
FB
COMP
Internal Ramp
+
x = 1, 2, 3 or 4
V
FFB
+
相關(guān)PDF資料
PDF描述
NCP5318FTR2G Two/Three/Four−Phase Buck CPU Controller
NCP5322ADWG Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC
NCP5322ADWR2G Two−Phase Buck Controller with Integrated Gate Drivers and 5−Bit DAC
NCP5331FTR2G Two-Phase PWM Controller with Integrated Gate Drivers
NCP5331 Two-Phase PWM Controller with Integrated Gate Drivers
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(kāi)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(kāi)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(chēng):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(chēng):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(chēng):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(kāi)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(kāi)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*