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參數(shù)資料
| 型號(hào)： | 5S3.2000LV |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 133K |
| 代理商： | 5S3.2000LV |
A
12 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
6
3/2001
Remote Sense
The simple circuit of figure 5 may be used to add remote
sensing to the LV single series. This circuit might be useful
when your actual load is at some distance from the converter
and you want to automatically compensate for voltage drops.
Other situations where this circuit is useful are: Compensating
for the voltage drop through a connector and creating a very
stiff load voltage even when the load varies greatly. The circuit
shown is for a 5 volt output, change R4 for other output
voltages.
Figure 5.
This simple circuit may be added to provide for remote sensing and
automatic correction of the load voltage. See our application note on
this circuit for more information.
Output Trimming
The trim pin may be used to adjust the outputs by up to ±10
% from the nominal factory setting. The trim may be used to
adjust for system wiring voltage drops or to adjust the +5
output up to 5.2 volts for ECL applications. Figure 6 shows the
proper connections to use the trim pin. If output trimming is not
desired the trim pin may be safely left floating.
Figure 6.
Output trimming may be accomplished by using a single fixed
resistor or a trimpot as shown. When using fixed resistors the values
may range from 0 to infinity ohms. See the text for more information
on output power when trimming. The trimpot should be 10K for 3 and
5 volt outputs and 20K for 12 and 15 volt outputs.
Trimming the output up reduces the output current
proportionally to keep the maximum power constant. Output
CALEX
5S5.2000LV
DC/DC CONVERTER
4
6
5
R1 = 470 OHM, 1/4W, 5%
R2 = 1.0K, 1/4W, 5%
R3 = 2.4K, 1/4W, 5%
R4, R5 = 4.99K, 1/4W, 5%
C1 = 0.01F, 100V, CER
D1 = 1N4448
Q1 = 2N3906
IC1 = TL431CLP
current is not increased over the listed maximum when
trimming the output voltage down.
Down trim actually can reduce the minimum input voltage
in some circuits. Full up trim may not be achievable at
minimum input voltage and full rated load.
Non Standard Output Voltages
The 12 and 15 volt LVs will typically trim much lower than the
-10% specified. This allows the 12 and 15 volt LV’s to be
trimmed lower than specified for RF or other special
applications.
The 12 volt LV’s can be typically trimmed over a range of
8.7 to 13.3 volts. The 15 volt LV’s can be typically trimmed
over a range of 9.8 to 16.8 volts.
Grounding
The input and output sections are fully floating from each
other. They may be operated fully floating or with a common
ground. If the input and output sections are connected either
directly at the converter or at some remote location from the
converter it is suggested that a 1 to 10 F, 0.5 to 5 ohm ESR
capacitor bypass be used directly at the converters output
pins. These capacitors prevent any common mode switching
currents from showing up at the converters output as normal
mode output noise. See “Applying the Output” for more
information on selecting output capacitors.
Also see the CALEX application note “Dealing With
Common Mode Noise” for more information on using common
grounds.
Case Grounding
The copper case serves not only as a heat sink but also as a
EMI shield. The 0.017 inch thick case provides >25 dB of
absorption loss to both electric and magnetic fields at 220
kHz, while at the same time providing 20 to 40 % better heat
sinking over competitive thin steel, aluminum or plastic designs.
The case shield is tied to the CMN output pin. This
connection is shown on the block diagram. The case is
floating from the input sections. The input is coupled to the
outputs only by the low 375 pF of isolation capacitance. This
low I/O capacitance insures that any AC common mode noise
on the inputs is not coupled to your output circuits.
Compare this isolation to the more usual 1000 - 2000 pF
found on competitive designs and you will see that CALEX
provides the very best DC and AC isolation available. After all,
you are buying an isolated DC/DC to cut ground loops. Don’t
let the isolation capacitance add them back in.
Temperature Derating
The LV Single series can operate up to 85°C case temperature
without derating. Case temperature may be roughly calculated
from ambient by knowing that the case temperature rise is
approximately 9.5°C per package watt dissipated.
For example: If a 12 volt output converter is delivering 9
watts with a 5 volt input, at what ambient could it expect to run
with no moving air and no extra heatsinking?
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