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12 volt to 13.8 volt DC/DC Converters (Regulators) |
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High power 12 volt to 13.8 volt DC/DC converters at low
cost. Suitable for voltage stabilization of automobile electronics, special purpose UPS, etc. |
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Regulates the
voltage and keeps computers and other equipment from turning of during car starting and other voltage sags
These are Boost Converters. which put out 13.8 volts with an input voltage of
12V nominal. (10-15V) We stock other output voltages in the PST-SR700 package, see our web page for options. We also stock an
adjustable version of the SR700 that runs from 15 to 24 volts. This adjustable dc/dc converter (PST-SR700-adjustable)
has a front panel knob to adjust the voltage, but is otherwise identical to the fixed voltage converters.
Motors: Running motors from these units will void the warranty.
| Model Number |
PST-SR500
(formerly PST-DU500)
$118.80
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PST-SR700
(formerly PST-DU700)
$145.48
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PST-SR700-Adjustable
(formerly PST-DU700
Adjustable)
$154.00
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PST-DC/2812-8 (formerly PST/DC1212-8) Isolated Buck-boost
$144.76
Click
here for picture |
| Input Voltage Range |
9 VDC to 14 VDC
New feature: Will not turn off during car starting if the
voltage stays above 6 volts |
10 VDC to 15 VDC
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10 V to 30 V |
| Output Voltage |
13.8 VDC |
13.8 VDC |
Adjustable beween 15 and 24 volts |
12 VDC |
| Peak Output Power |
500 Watts (1 to 5 minutes) |
700 Watts (1 to 5 minutes) |
700 Watts (1 to 5 minutes) |
120 Watts |
| Peak Output Current |
36 Amps |
50 Amps |
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10 Amps |
| Continuous Current |
15 Amps |
20 Amps |
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8.3 Amps |
| Continuous Output Power |
207 Watts |
276 Watts |
276 Watts |
100 Watts |
| Output Voltage |
13.8 Volts (adjustable to 15 volts by internal pot. Outputs up to 24 volts are
available from the factory). |
Front Panel Adustable between 15 to 24 volts |
12 volts, (adjustable between 11 and 13.9 volts with internal pot) |
| No-Load Overhead |
150 mA |
<100 mA |
| Line Regulation |
± 0.07 Volts |
1% |
| Load Regulation |
± 0.14 Volts |
3% |
| Isolation |
Although the output is isolated from noise, spikes, and voltage sags on the input,
the input and output grounds are common, so this dc to dc converter is not usable in positive ground cars without
totally isolating the equipment being powered from the frame of the car. |
| Efficiency |
>85% (see chart below) |
>75-85% |
| Dimensions |
200 x 170 x 70 mm
7.9 x 6.7 x 2.8 inches |
200 x 205 x 70 mm
7.9 x 8.0 x 2.8 inches |
300mm x 88mm x 42mm (L x W xH)
(11.8 in x 3.5 in x 1.7 in)
See drawing |
| Drawing |
Click Here for Drawing |
Click Here for Drawing |
Click Here for Drawing |
| Weight |
1 kg, 2.2 pounds |
1.5 kg, 3.3 pounds |
1.5 kg, 3.3 pounds |
| Price |
PST-SR500
$118.80
1-10 $118.80
11-100 $109.67
101-500 $71.50
500+ $57.75 |
PST-SR700
$145.48
1-10 $145.48
11-100 $138.03
101-500 $90.75
500+ $73.92 |
PST-SR700-adj
$154.00
1-10 $154.00
11-100 $139.57
101-500 $91.85
500+ $82.78 |
PST-DC/2812-8 (formerly PST/DC1212-8) Isolated Buck-boost
$144.76
1-10 $144.76
11-100 $127.05
101-500 $86.79
500+ $81.07 |
The following efficiency measurements were made by the U.S. General Fuel Cell Corporation, and are
used with permission.
| Efficiency measurements of the SR-500 |
| Vin |
Amps in |
Watts in |
Watts Out |
Efficiency |
| 12.25 V |
3.9 A |
48 |
43 |
89% |
| 12.3 V |
5.6 A |
69 |
64 |
93% |
| 12.11 V |
11.3 A |
137 |
123 |
90% |
| 11.92 |
20.9 |
249 |
213 |
86% |
Advantages:
 Inexpensive high current DC/DC converter stabilizes voltage in
automotive applications.
Also can be used to provide regulated 12 volts from a sealed
lead acid battery--excellent for special purpose UPS DC battery backups.
High efficiency >85%.
RF Noise
Although this was designed for audio equipment, a number of customers have wanted to use these
(and their sister products) in RF applications. Several customers have used these for Ham Radio applications and loved them,
others found way too much noise for the converter to be useful. This was a puzzlement. It still is a puzzlement.
However,
recently I asked one of our engineers to dust off our old screen room and investigate the noise. We found that at full power
and lower there was very little radiated noise, using 2-3 foot cables on either end. We don't have a calibrated antenna, but if
you left the screen room door open just a crack the background radio noise swamped out the converter's radiated
noise.
Conducted noise, however, was not below the background, particularly in the 10 to 80 MHz band and so I asked him
to do a noise reduction project. It took about a month of his spare time, but he was able to reduce the noise by a factor of 20
in this band. The noise at other frequencies was also reduced quite a bit, but he didn't quantify it.
I have always
suspected that manufacturing errors or variations might explain why some people see low noise and other see high noise. One of
our customers is returning a unit in early 2007 that he has problems with and we are anxious to take a look at that to see how
it performs and how our noise fixes work with it.
Another answer to this puzzlement may be that some radios handle
conducted noise on the power supply better than others. But there haven't been enough reports to make any conclusions on this
from our end.
Hopefully more news in the near future.
Reviews of this product by Ham Radio engineers, showing
both high and low noise emissions, are located here;http://www.eham.net/reviews/detail/4646 |
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PowerStream Technology: 140 South Mountainway Drive, Orem
Utah 84058
Phone: 801-764-9060  Fax: 801-764-9061 |
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© Copyright 2000, 2002, 2003, 2004, 2005, 2008, 2009 Lund Instrument
Engineering, Inc. All rights reserved This material is copyrighted original work. It is forbidden to use this
information, text, or graphics in full or in part on another web site without written permission. This prohibition includes
making derivative text using automatic thesaurus substitution software. |
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