- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361102 > NCP5306DW (ON SEMICONDUCTOR) Three−Phase VRM 9.0 Buck Controller PDF資料下載
參數(shù)資料
| 型號： | NCP5306DW |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Three−Phase VRM 9.0 Buck Controller |
| 中文描述： | 0.1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 879K |
| 代理商： | NCP5306DW |
NCP5306
http://onsemi.com
12
Enhanced V
2
responds to disturbances in V
CORE
by
employing both “slow” and “fast” voltage regulation. The
internal error amplifier performs the slow regulation.
Depending on the gain and frequency compensation set by
the amplifier’s external components, the error amplifier will
typically begin to ramp its output to react to changes in the
output voltage in one or two PWM cycles. Fast voltage
feedback is implemented by a direct connection from Vcore
to the non
inverting pin of the PWM comparator via the
summation with the inductor current, internal ramp and
offset. A rapid increase in output current will produce a
negative offset at Vcore and at the output of the summer.
This will cause the PWM duty cycle to increase almost
instantly. Fast feedback will typically adjust the PWM duty
cycle in one PWM cycle.
As shown in Figure 14, an internal ramp (nominally 115 mV
at a 50% duty cycle) is added to the inductor current ramp
at the positive terminal of the PWM comparator. This
additional ramp compensates for propagation time delays
from the current sense amplifier (CSA), the PWM
comparator and the MOSFET gate drivers. As a result, the
minimum ON time of the controller is reduced and lower
duty
cycles may be achieved at higher frequencies. Also,
the additional ramp reduces the reliance on the inductor
current ramp and allows greater flexibility when choosing
the output inductor and the R
CSx
C
CSx
time constant of the
feedback components from V
CORE
to the CSx pin.
Including both current and voltage information in the
feedback signal allows the open loop output impedance of
the power stage to be controlled. When the average output
current is zero, the COMP pin will be:
VCOMP
VOUT@ 0 A
Int_Ramp
Channel_Startup_Offset
GCSA
Ext_Ramp 2
Int_Ramp is the “partial” internal ramp value at the
corresponding duty cycle, Ext_Ramp is the peak
to
peak
external steady
state ramp at 0 A, G
CSA
is the current sense
amplifier gain (nominally 2.6 V/V) and the channel startup
offset is typically 0.60 V. The magnitude of the Ext_Ramp
can be calculated from:
Ext_Ramp
D
(VIN
VOUT) (RCSx
CCSx
fSW)
For example, if V
OUT
at 0 A is set to 1.700 V with AVP
and the input voltage is 12.0 V, the duty cycle (D) will be
1.700/12.0 or 14.2%. Int_Ramp will be 115 mV/50%
14.2%
= 33 mV. Realistic values for R
CSx
, C
CSx
and f
SW
are 10 k
Ω
,
0.015
μ
F and 650 kHz. Using these and the previously
mentioned formula, Ext_Ramp will be 15.0 mV.
VCOMP
1.700 V
2.6 V V
2.3 Vdc.
0.60 V
15.0 mV 2
33 mV
If the COMP pin is held steady and the inductor current
changes, there must also be a change in the output voltage.
Or, in a closed loop configuration when the output current
changes, the COMP pin must move to keep the same output
voltage. The required change in the output voltage or COMP
pin depends on the scaling of the current feedback signal and
is calculated as:
V
RS
GCSA
IOUT
The single
phase power stage output impedance is:
Single Stage Impedance
VOUT
IOUT
RS
GCSA
The total output impedance will be the single stage
impedance divided by 3.
The output impedance of the power stage determines how
the converter will respond during the first few microseconds
of a transient before the feedback loop has repositioned the
COMP pin.
The peak output current can be calculated from:
IOUT,PEAK
(VCOMP
VOUT
Offset) (RS
GCSA)
Figure 15 shows the step response of the COMP pin at a
fixed level. Before T1, the converter is in normal
steady
state operation. The inductor current provides a
portion of the PWM ramp through the current sense
amplifier. The PWM cycle ends when the sum of the current
ramp, the “partial” internal ramp voltage signal and offset
exceed the level of the COMP pin. At T1, the output current
increases and the output voltage sags. The next PWM cycle
begins and the cycle continues longer than previously while
the current signal increases enough to make up for the lower
voltage at the V
FB
pin and the cycle ends at T2. After T2, the
output voltage remains lower than at light load and the
average current signal level (CSx output) is raised so that the
sum of the current and voltage signal is the same as with the
original load. In a closed loop system, the COMP pin would
move higher to restore the output voltage to the original
level.
SWNODE
V
FB
(V
OUT
)
Internal Ramp
CSA Out w/
Exaggerated
Delays
COMP
Offset
CSA Out + Ramp + CS
REF
T1
T2
Figure 15. Open Loop Operation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCP5306DWR2 | Three−Phase VRM 9.0 Buck Controller |
| NCP5314FTR2G | Two/Three/Four−Phase Buck CPU Controller |
| NCP5318 | Two/Three/Four−Phase Buck CPU Controller |
| NCP5318FTR2 | Two/Three/Four−Phase Buck CPU Controller |
| NCP5318FTR2G | Two/Three/Four−Phase Buck CPU Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP5306DWR2 | 功能描述:IC CTRLR BUCK 3PH VRM 9.0 24SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| NCP5314 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two/Three/Four-Phase Buck CPU Controller |
| NCP5314/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Two/Three/Four-Phase Buck CPU Controller |
| NCP5314_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Two/Three/Four−Phase Buck CPU Controller |
| NCP5314FTR2 | 功能描述:IC CTRLR BUCK CPU 2/3/4PH 32LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。