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參數(shù)資料
| 型號： | LX1671CPW-TR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO38 |
| 封裝： | ROHS COMPLIANT, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大?。?/td> | 419K |
| 代理商： | LX1671CPW-TR |
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 14
Copyright
2000
Rev. 1.2b, 2006-02-13
WWW
.Microse
m
i
.CO
M
LX1671
Multiple Output LoadSHARE PWM
PRODUCTION DATA SHEET
TM
TH EORY OF O PERAT ION (CON TINUE D)
BI-PHASE, LOADSHARE (PROPORTIONAL METHOD)
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.
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.
L1,
Switch
Side
L2,
Switch
Side
62k
+
-
62k
4700pF
62k
Offset
Voltage
Generator
-
+
ESR L1
10m
Ω
ESR L2
10m
Ω
Vou
1.5V @ 12A
18W
Phase 2
Error Amp
Phase 1
Phase 2
V1
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
PWM
Input
Figure 9 – LoadSHARE Using Proportional Control
AA
PP
LL
IICC
AA
TT
IIOO
NN
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| LX1672-05CPWTR | 1 A DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO28 |
| LX1672-03CLQTR | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
| LX1673-03CPWTR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| LX1673-03CLQTR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC20 |
| LX1673-09CPWTR | 1 A SWITCHING CONTROLLER, 1035 kHz SWITCHING FREQ-MAX, PDSO20 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LX1671EVALKIT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Switching Regulator |
| LX1672 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Multiple Output LoadSHARE PWM |
| 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) |
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