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參數(shù)資料
| 型號： | LX1673-09CLQT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1035 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | PLASTIC, MLPQ-20 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 302K |
| 代理商： | LX1673-09CLQT |
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12
Copyright
2000
Rev. 0.2j, 2002-07-17
WWW
.M
ic
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sem
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.COM
LX1673
High Frequency PWM Regulator
PRELIMINARY
INTEGR A T E D
PR ODU C T S
APPLI CATION NOT E
APPLI CATION NOT E (CON T I NUE D)
(CON T I NUE D)
OUTPUT DISABLE
The LX1673 PWM MOSFET driver outputs are shut off by
pulling the disable (DIS) pin above 1.2V. There is a 80K
pulldown resistor on this input.
The LDO voltage regulator has its own Disable pin (LDDIS)
for control of this output voltage. Pulling this pin above 3 V
disables the LDO. There is a 100K
pulldown resistor on this
input.
PROGRAMMING THE OUTPUT VOLTAGE
The output Voltage is sensed by the feedback pin (FBX) which
is compared to a 0.8V reference. The output voltage can be set to
any voltage above 0.8V (and lower than the input voltage) by
means of a resistor divider (see Figure 1).
)
/R
R
(1
V
2
1
REF
OUT
+
=
Note: This equation is simplified and does not account for
error amplifier input current. Keep R1 and R2 close to 1k (order
of magnitude).
DDR VTT TERMINATION VOLTAGE
Double Data Rate (DDR) SDRAM requires a termination
voltage (VTT) in addition to the line driver supply voltage (VDDQ)
and receiver supply voltage (VDD).
Although it is not a
requirement VDD is generally equal to VDDQ so that only VTT
and VDDQ are required..
VTT for DDR memory can be generated with the LX1673 by
using the positive input of the phase 2 error amplifier RF2 as a
reference input from an external reference voltage VREF which is
defined as one half of VDDQ. Using VREF as the reference input
will insure that all voltages are correct and track each other as
specified in the JEDEC (EIA/JESD8-9A) specification. The phase 2
output will then be equal to VREF and track the VDDQ supply as
required.
When an external reference is used the connection between the
error amplifier positive input and the Soft Start pin is lost and Soft
Start will not function. It is recommended that the external
reference voltage have an R-C time constant that will be long
enough to allow the output capacitor to charge slowly.
See Microsemi Application Note 17 for more details.
AA
PP
LL
IICC
AA
TT
IIOO
NN
SS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX1673-09CLQ-TR | 制造商:Microsemi Corporation 功能描述:VOLT MODE PWM CNTRLR 0.8V TO 5.5V 1A 20MLPQ - Tape and Reel |
| LX1673-09CPW | 功能描述:IC REG DL BCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數(shù):3 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:* 包裝:帶卷 (TR) 其它名稱:ISL6402IVZ-TTR |
| LX1673-09CPW-TR | 制造商:Microsemi Corporation 功能描述:VOLT MODE PWM CNTRLR 0.8V TO 5.5V 1A 20TSSOP - Tape and Reel |
| LX1675 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Multiple Output LoadSHARE⑩ PWM PRODUCTION DATA SHEET |
| LX1675 EVAL KIT | 制造商:Microsemi Corporation 功能描述:PWM CONTROLLERS - Bulk |
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