- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄56778 > 5S15.400LV 1-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE PDF資料下載
參數(shù)資料
| 型號(hào)： | 5S15.400LV |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 114K |
| 代理商： | 5S15.400LV |
A
6 Watt LV Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4
3/2001
L1 = 10H
C1 = 10F / 25V, TANTALUM
C2 = SEE TEXT
Generally this is not a problem with battery powered
circuits and only appears when the LV Single is powered by
marginally sized 5 or 12 volt linear supplies that can’t supply
the required startup current. See the “Input Current Vs. Line
Input” curve for the low voltage current requirements of the LV
Single.
Very Low Noise Input Circuit
Figure 2 shows a very low noise input circuit that may be used
with the converters. This circuit will reduce the input reflected
ripple current to less than 5 mA RMS (Vin = 5 V, 10 kHz to 1
MHz bw). See the discussion above for the optimum selection
of C2.
Figure 2.
This circuit will reduce the input reflected ripple current to less than
5 mA RMS. See the discussion in the text for help on the optimum
selection of C2. L1 should be sized to handle the maximum input
current at your lowest operating voltage and maximum expected
output power.
Suggested Capacitor Sources
These capacitors may be used to lower the impedance at the
input of the converter. These capacitors will work for 100%
load, worst case input voltage and ambient temperature
extremes. They however, may be oversized for your exact
usage, see “Picking An External Input Capacitor” above for
more information. You may also use several smaller capacitors
in parallel to achieve the same ripple current rating. This may
save space in some systems.
United Chemi-Con LXF, SXE, RXC, RZ and RZA series
Suggested Part:
LXF25VB221M8X15LL
220F, 25V, 105°C Rated
ESR = 0.13 ohms
Allowable Ripple at 85 °C = 960 mA
Nichicon
PR and PF series
Suggested Part:
UPR1E102MRH
1000F, 25V, 105°C Rated
ESR = 0.1 ohms
Allowable Ripple at 85°C = 1.2 A
Panasonic
HFG and HFQ Series
Suggested Part:
ECEA1EFG102
1000F, 25V, 105°C Rated
ESR = 0.05 ohms
Allowable Ripple at 105°C = 1.28 A
required when operating with about a 6 volt input. The
impedance reduces as the input voltage is raised or lowered
or the power is reduced. In general you should keep the peak
to peak voltage measured across the input pins less than 0.25
volts peak to peak (not including the high frequency spikes)
for maximum converter performance and life.
There is no lower limit on the allowed source impedance,
it can be any physically realizable value, even approaching 0.
If the source impedance is too large in your system you
should choose an external input capacitor as detailed below.
Picking An External Input Capacitor
If an input capacitor is needed at the input to the converter it
must be sized correctly for proper converter operation. The
curve “RMS Input Current Vs Line Input” shows the RMS
ripple current that the input capacitor must withstand with
varying loading conditions and input voltages.
Several system tradeoffs must be made for each particular
system application to correctly size the input capacitor.
The probable result of undersizing the capacitor is increased
self heating, shortening it’s life. Oversizing the capacitor can
have a negative effect on your products cost and size,
although this kind of overdesign does not result in shorter life
of any components.
There is no one optimum value for the input capacitor. The
size and capacity depend on the following factors:
1) Expected ambient temperature and your temperature
derating guidelines.
2) Your ripple current derating guidelines.
3) The maximum anticipated load on the converter.
4) The input operating voltage, both nominal and excursions.
5) The statistical probability that your system will spend a
significant time at any worst case extreme.
Factors 1 and 2 depend on your system design guidelines.
These can range from 50 to 100% of the manufacturers listed
maximum rating, although the usual derating factor applied is
about 70%. For example 70% derating means if the
manufacturer rated the capacitor at 1 A RMS you would not
use it over 0.7 A RMS in your circuit.
Factors 3 and 4 realistically determine the worst case ripple
current rating required for the capacitor along with the RMS
ripple current curve.
Factor 5 is not easy to quantify. At CALEX we can make no
assumptions about a customers system so we leave to you
the decision of how you define how big is big enough.
Suitable capacitors for use at the input of the converter are
given at the end of this section.
Startup Current Demand
Because the LV Single appears as a constant power load to
your source and operation starts at about 3 volts, you should
be sure that your source can supply the required current at low
voltages when starting.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 5S12.500LV | 1-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| 5S5R2.1200LV | 1-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| 5S5.2.1200LV | 1-OUTPUT 6 W DC-DC REG PWR SUPPLY MODULE |
| 5S5.2000LV | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 5S3.2000LV | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 5S1F | 制造商:Square D by Schneider Electric 功能描述:TRANSFORMER DRY 5KVA 240X480V-120/240V |
| 5S201-B02 | 制造商:Leviton Manufacturing Co 功能描述: |
| 5S251S0F1000 | 功能描述:JOYSTICK 5000 POTENTIOMETER RoHS:是 類別:電位計(jì)，可變電阻器 >> 搖桿 系列:5000 標(biāo)準(zhǔn)包裝:200 系列:253 電阻（歐姆）:20k 功率（瓦特）:0.01W 容差:±30% 調(diào)節(jié)型:頂部調(diào)節(jié) 回轉(zhuǎn)角度:60° 安裝類型:通孔 封裝/外殼:方形 - 0.768" L x 0.693" W x 0.236" H（19.50mm x 17.60mm x 6.00mm） 包裝:散裝 |
| 5S3-2 | 制造商:CAMLOC (ALCOA) 功能描述: |
| 5S4451AA | 制造商:n/a 功能描述:Ships in 2 days |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。