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参数资料
| 型号： | LX1672-03CLQTR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封装： | PLASTIC, MLPQ-38 |
| 文件页数： | 5/20页 |
| 文件大小： | 358K |
| 代理商： | LX1672-03CLQTR |
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
WWW
.Microse
m
i
.CO
M
LX1672
Multiple Output LoadSHARE PWM
PRELIMINARY DATA SHEET
TM
TH EORY OF O PERAT ION (C ON 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
+
-
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
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
Figure 9 –LoadSHARE
Using Proportional Control
AA
PP
LL
IICC
AA
TT
IIOO
NN
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| LX1673-06CLQ | 1 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC20 |
| LX1673-03CPW-TR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:LoadSHARE™ 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LX1672-03CPW-TR | 制造商:Microsemi Corporation 功能描述:MOSFET DRVR 0.8V 1A 3-OUT HI/LO SIDE HALF BRDG NON-INV 28TSS - Tape and Reel |
| LX1672-05CPW | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:LoadSHARE™ 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LX1672-05CPW-TR | 制造商:Microsemi Corporation 功能描述:MOSFET DRVR 0.8V 1A 3-OUT HI/LO SIDE HALF BRDG NON-INV 28TSS - Tape and Reel |
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