參數(shù)資料
型號(hào)： A8281SLB
廠商： Allegro MicroSystems, Inc.
英文描述： LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS
中文描述： LNB電源與控制，電壓調(diào)節(jié)器
文件頁(yè)數(shù)： 6/14頁(yè)
文件大?。?/td> 375K
代理商： A8281SLB
8281
AND
8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
APPLICATIONS INFORMATION
Component selection:
Input capacitor, C
IN
.
An electrolytic capacitor
should be located as close to the device VIN terminal
as possible. The input current is a square wave with
fast rise and fall times so the capacitor must be able to
handle the rms current without excessive temperature
rise. The value of this capacitor is not as important as
the ESR. The worst-case current is with maximum
load current, minimum V
IN
, and maximum V
LNB
(highest switch duty cycle). Choose a capacitor with
a ripple current rating greater than
I
cin
= I
LNB
x 1.2 x V
LNB(max)
/V
IN(min)
Buck inductor, L1.
A 100
-
μ
H power inductor is
appropriate for all operating conditions. The rated
saturation current of the inductor must be greater than
1.3
-
A. To maximize efficiency, the dc resistance
should be less than 350
-
m
.
Clamp diode, D1.
A Schottky diode is required at
the switching node LX. This diode should be rated at
1.5 times the maximum load current.
Output capacitor, C
BULK
.
A low-ESR (<200
-
m
)
electrolytic capacitor is recommended to minimize
the ripple voltage. Less than 50
-
mV peak-to-peak is a
reasonable goal.
V
ripple(PP)
= ESR x I
ripple(max)
where
I
ripple(max)
= V
BULK(min)
x (1 – [V
BULK(min)
/V
IN(max)
]) /
(L1 x 352
-
kHz).
Output capacitor, C
LNB
.
Increasing the output
capacitance, C
LNB
, will attenuate noise. However,
this is limited by the requirement for low cable
capacitance for 22
-
kHz tone transmission.
Also, because the linear regulator sink current is
limited, high values of output capacitance combined
with low levels of output current can cause overshoot
of the 22
-
kHz tone. Operating points above the line
in the following graph will not have excessive over-
shoot.
0.5
Dwg. GP-074
1.0
1.5
OUTPUT CAPACITANCE IN μF
0
100
O
50
0
25
75
125
MINIMAL OVERSHOOT
EXCESSIVE OVERSHOOT
Layout notes:
1. The printed wiring board should use a heavy
ground plane. A two-sided board with ground planes
on both sides of the board is most desirable. Several
copper vias under the device can be used to connect
the ground planes and enhance thermal performance.
2. For optimum electrical and thermal performance,
the device should be soldered directly onto the board.
3. Keep the sense resistor traces as short and as wide
as possible to lower trace resistance.
4. Connect the bypass capacitors as close to the
device as possible. The lower value ceramic capaci-
tors should be closer to the device than the
electrolytics. The supply voltage, V
IN
, should be
decoupled with an electrolytic capacitor placed as
close to the device as possible.
5. Place the TCAP capacitor as close to the device as
possible.
相關(guān)PDF資料
PDF描述
A8283 Low-Noise Block Supply and Control-Voltage Regulator(低噪聲組件,電源和控制電壓穩(wěn)壓器)
A8284 Two Output Low-Noise Block Supply and Control-Voltage Regulator(雙輸出低噪聲組件,電源和控制電壓穩(wěn)壓器)
A8285 LNB Supply and Control Voltage Regulator
A8287SLB LNB Supply and Control Voltage Regulator
A8287 LNB Supply and Control Voltage Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
A8281SLBTR 功能描述:IC REG LNB SUPPLY/CTRL 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)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(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
A8282SLB 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)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(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
A8282SLB-T 制造商:Allegro MicroSystems LLC 功能描述:
A8282SLBTR 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)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(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
A8282SLBTR-T 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)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(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*