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September 23, 2023

12 volt to 13.8 volt DC/DC Converters (Regulators)

12 volt dc to dc converter regulator 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.

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.
Model Number PST-SR500
obsolete, please consider the PST-DC1212-15
DC/DC Converter Regulator
Quantity Pricing:
1-10 $198
11-100 $189
101-500 $158
Quantity Pricing:
1-10 $198
11-100 $189
101-500 $158
PST-DC/2812-8 Isolated Buck-boost
Quantity Pricing:
1-10 $198
11-100 $189
101-500 $158
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 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   10 Amps
Continuous Current 15 Amps 20 Amps 14.5A 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.
Protections Input Polarity Protection
Over-Votage and Short Circuit Protection
Output Overcurrent Shut Down
Over Temperature Protection
Output Over-Voltage Protection
Efficiency >85% (see chart below) >75-85%
Connections Screw terminals* Screw terminals* Screw terminals
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
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
  (formerly PST-DU500) (formerly PST-DU700) PDF User's Manual (formerly PST/DC1212-8

*The two sets of output terminals are connected together, you can draw all the power from one or the other. There are two sets of terminals for convenience in case you want to run more than one piece of equipment.

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%


OEM Battery Chargers Inexpensive high current DC/DC converter stabilizes voltage in automotive applications.

OEM Battery Chargers Also can be used to provide regulated 12 volts from a sealed lead acid battery--excellent for special purpose UPS DC battery backups.

OEM Power Supplies 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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