參數(shù)資料
型號: LX1676-CPWTR
廠商: MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類: 穩(wěn)壓器
英文描述: 1.5 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO38
封裝: PLASTIC, TSSOP-38
文件頁數(shù): 3/16頁
文件大?。?/td> 387K
代理商: LX1676-CPWTR
LX1676
PRELIMINARY DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
WWW
.Microse
m
i
.CO
M
Mobile AMD Athlon
VRM Controller
I N T E GR A T ED
PRODUCT S
Copyright
2000
Revision: 0.4b, 9/14/2004
TH EORY OF O PERATION (CONTINUED)
THEORY OF OPERATION FOR A BI-PHASE,
LOADSHARE
TM CONFIGURATION
The basic principle used in LoadSHARETM in a multiple
phase buck converter topology is that if multiple, identical,
inductors have the same identical voltage impressed across
their leads, they must then have the same identical current
passing through them. The current that we would like to
balance between inductors is mainly the DC component
along with as much as possible the transient current. All
inductors in a multiphase buck converter topology have
their output side tied together at the output filter capacitors.
Therefore this side of all the inductors has the same
identical voltage.
If the input side of the inductors can be forced to have
the same equivalent DC potential on this lead, then they
will have the same DC current flowing. To achieve this
requirement, phase 1 will be the control phase that sets the
output operating voltage, under normal PWM operation.
To force the current of phase 2 to be equal to the current of
phase 1; a second feedback loop is used. Phase 2 has a low
pass filter connected from the input side of each inductor.
This side of the inductors has a square wave signal that is
proportional to its duty cycle. The output of each LPF is a
DC
(+ some AC) signal that is proportional to the
magnitude and duty cycle of its respective inductor signal.
The second feedback loop will use the output of the
phase 1 LPF as a reference signal for an error amplifier
that will compare this reference to the output of the phase 2
LPF. This error signal will be amplified and used to
control the PWM circuit of phase 2. Therefore, the duty
cycle of phase 2 will be set so that the equivalent voltage
potential will be forced across the phase 2 inductor as
compared to the phase 1 inductor. This will force the
current in the phase 2 inductor to follow and equal the
phase 1 inductor current.
With the LoadSHARETM topology it is possible to
imbalance the phases so that one phase will supply more
current than the other under unique situations. The LX1676
will normally be used with the same supply voltages on
phase 1 and 2 PWM inputs and will have equal currents in
both phases.
+
-
LP2
LP1
Phase 1
Comparator
+
_
+
_
+
-
gm
Phase 2
Comparator
180°
Phase 2
Integrating
Amp
Differential
Amp
+
-
DC Bias
Phase 1 Error
Amp
+
-
PW
M
PWM
HO1
EA -
EO2
LO1
LO2
HO2
Phase 1
Low Pass Filter
Phase 2
Low Pass Filter
Vout
DC Bias
DACOUT
Differential Feedbach From Vout
Phase 1 Diff
Amp
Ramp .75 V to 3 V
Both PWMs
Figure 5 – LoadSHARE Control Loop
AA
PP
LL
IICC
AA
TT
IIOO
NN
SS
相關(guān)PDF資料
PDF描述
LX1732CDUT 1 A SWITCHING REGULATOR, 135 kHz SWITCHING FREQ-MAX, PDSO8
LX1801CLQ SPECIALTY ANALOG CIRCUIT, PQCC16
LX1801CLQ-TR SPECIALTY ANALOG CIRCUIT, PQCC16
LY5150ALH SPECIALTY ANALOG CIRCUIT, PBGA16
LY5150ALHTR SPECIALTY ANALOG CIRCUIT, PBGA16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LX1677 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:AMD64 Processor VRM Controller
LX1677 EVAL KIT 制造商:Microsemi Corporation 功能描述:PWM CONTROLLERS - Bulk
LX1677CLQ 功能描述:IC CTRLR VRM PS 2PHASE 38MLPQ RoHS:是 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 供應商設備封裝:42-WLP 包裝:帶卷 (TR)
LX1677CPW 功能描述:IC CTRLR VRM PS 2PHASE 38TSSOP RoHS:是 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 供應商設備封裝:42-WLP 包裝:帶卷 (TR)
LX1681 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:VOLTAGE - MODE PWM CONTROLLERS