January 15, 2024

12 volt to 13.8 volt 15 Amp DC/DC Converters (Regulators)

12 volt to 13.8V dc to dc converter regulator

Small 12 volt to 13.8 volt DC/DC converters at low cost. Suitable for voltage stabilization of automobile electronics, special purpose UPSs, etc. The extremely high efficiency means that we can do away with extruded aluminum heat sinks.

Regulates the voltage and keeps computers and other equipment from turning of during car starting and other voltage sags

These are non-isolated Boost Converters. which put out 13.8 volts with an input voltage of 12V nominal.

Model Number	PST-DC1212-15 $99
Input Voltage Range	9 VDC to 14.5
Output Voltage	13.8 VDC
Peak Output Power	275 Watts (1 to 5 minutes)
Peak Output Current	20 Amps
Continuous Current	15 Amps
Continuous Output Power	207 Watts
No-Load Overhead	<15 mA
Line Regulation	± 0.4 Volts
Load Regulation	± 0.25 Volts
Noise	Dependant on output power, less than 300mV RMS
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	Over-Voltage and Short Circuit Protection Output Over current Shut Down Over Temperature protection
Operation Temperature	-40 to +80ºC
Reverse Polarity	Not protected from reverse polarity
Efficiency	Typically 93% (see chart below)
Connections	Screw terminals accept up to AWG 10
Weight	215 grams
Dimensions	2.8 x 3.8 x 1.3 inches, length 5" including flanges

Efficiency measurements at 15A output
Vin	Amps in	Watts in	Watts Out	Efficiency
9 V	28 A	252	207	81%
10 V	22.5 A	225	207	92%
12V	18.5A	222	207	93%
13V	16.6A	220	207	94%
14V	15.4	215	207	96%

Advantages:

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

Also can be used to provide regulated 13.8 volts from a sealed lead acid battery--excellent for special purpose UPS DC battery backups.

High efficiency >93% at full power and 12V or higher input.

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