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參數(shù)資料
| 型號： | LX1672 |
| 廠商： | Microsemi Corporation |
| 英文描述： | Multiple Output LoadSHARE PWM |
| 中文描述： | 多路輸出的PWM LoadSHARE |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 358K |
| 代理商： | LX1672 |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 13
Copyright
2000
Rev. 0.3m, 2005-04-12
W
M
.
C
LX1672
Multiple Output LoadSHARE PWM
P
RELIMINARY
D
ATA
S
HEET
TM
T H E O R Y O F O P E R A T I O N
( C O N T I N U E D )
Also a speed up capacitor can be used between the offset
amplifier output and the negative input of the Phase 2 error
amplifier. This will improve the transient response of the Phase 2
output current, so that it will share more equally with phase 1
current during a transient condition.
The use of a MOSFET input amplifier is required for the buffer
to prevent loading the low pass filter. The gain of the offset
amplifier, and the value of Ra and Rb, will determine the ratio of
currents between the phases at full load. Two external amplifiers
are required or this method.
B
I
-P
HASE
,
L
OAD
SHARE
(
P
ROPORTIONAL
M
ETHOD
)
The best topology for generating a current ratio at full load and
proportional between full load and no load is shown in figure 9.
The DC voltage difference between LPF1 and VOUT is a voltage
that is proportional to the current flowing in the Phase 1 inductor.
This voltage can be amplified and used to offset the voltage at
LPF2 through a large impedance that will not significantly alter
the characteristics of the low pass filter. At no load there will be
no offset voltage and no offset current between the two phases.
This will give the highest efficiency at no load.
L1,
Switch
Side
L2,
Switch
Side
62k
+
-
PWM
Input
62k
4700pF
62k
Offset
Voltage
Generator
-
+
ESR L1
10m
ESR L2
10m
Vout
1.5V @ 12A
18W
Phase 2
Error Amp
Phase 1
Phase 2
V
1
V2
1.5V
+73.3mV
1.5V
+46.7mV
7.33A
4.67A
+5V @ 7W
+3.3V @ 11W
LPF2
+
-
+
-
1M
4700pF
LPF1
Offset Amp
Vos
Rf
Rin
Ra
Rb
RF2
FB2
Figure 9 –LoadSHARE
Using Proportional Control
A
P
P
L
I
C
A
T
I
O
N
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX1672 EVAL KIT | 制造商:Microsemi Corporation 功能描述:SWITCHING REGULATOR - Bulk |
| LX1672_0508 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Multiple Output LoadSHARE PWM TM |
| LX1672-03CLQ | 功能描述:IC REG CTRLR BUCK PWM VM 38MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:LoadSHARE™ 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LX1672-03CLQ-TR | 制造商:Microsemi Corporation 功能描述:MOSFET DRVR 0.8V 1A 3-OUT Hi/Lo Side Half Brdg Non-Inv 38-Pin MLPQ T/R |
| LX1672-03CPW | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:LoadSHARE™ 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
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