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October 10, 2019

75 Watt 5V 15A Output Fully Isolated DC/DC Converter with 24VAC (13VAC-53VAC) input

24VDC in 5VDC DC converter
24VAC inverters, DC converters, battery backupsMore 24VAC low voltage power options
24VAC to 1V, 3V, 3.3V, 4V, 4.8V, 5V, 6V 8V, 8.4V, 9V, 10V, 11V, 12V, 13V, 14V, 14.4V, 15V, 16V, 17V, 18V
Smaller 24VAC to 5V converter, 5Amps

Run 5 volt equipment in 24VAC environments up to 15Amps

Quantity 1-9 10-99 100-499 500-999
Price PST-ACDC2405-15 $49.00
$43.25 $35.30 $31.50
Isolated low voltage AC/DC converter board for security systems.
PST-DC2405-10 24 VAC to 5V, 75W AC-DC converter
Nominal Input Voltages 24VAC, 36VAC, 48VAC
Input Range 13VAC to 53VAC
Note: some components have to be changed by us if you intend to run above 35VAC input
Output Voltage 5VDC (trimable from 3.9 to 5.5 VDC by adding two resistors)
Output Current 0 to 15 Amps (may be limited by available input power)
Output Power zero to 75 Watts
Voltage set point accuracy ±1%
Line Regulation ±1%
Load Regulation ±1%
Ripple and noise 75mVp-p
Efficiency 84% at 9-10 amps output
Dynamic Regulation 50% load step 4%
  Settling time 100 µSec
Remote turn-on When the two input terminals on J3 are shorted together the unit turns OFF.
Output voltage trim range ±10%
Short circuit protection Continuous
Over current protection Continuous, 110-150% threshold
Over voltage protection Continuous, 110-140% trip range
Turn-on time < 10 mS
Switching Frequency 400 kHz
Temperature Coefficient ±0.02% /°C
Temperature range -40°C to 100°C operating (baseplate)
  -55°C to +125°C storage
Size 78mm x 170 mm (3 x 6.7 inches)
Weight 4 oz, 113 grams
Humidity <95%, non condensing
Vibration 5G, 3 axis, 5 minutes each

Application Notes:

Remote sense and trim functions
To use the remote sense, connect the "Sense +" and "Sense -" terminals to wires that go to the load and don't carry any current. This lets the DC converter stabilize the voltage at the load, compensating for voltage loss in the wires that carry current.
In other words, without using the "Sense" terminals the voltage will be stabilize at the converter output terminals. As the current flows through wires, connectors, and contacts then resistance of these elements will cause a voltage drop due to Ohm's law. If you run an extra set of wires from the sense terminals to the load that don't carry current, then these can be used to sense the actual voltage at the load and the converter will boost its voltage to compensate for this voltage drop (over a limited range, ±0.5 Volts.)

The sense terminals can also be used to trim the voltage with fixed resistors or a pot as follows:
How to arrange the trimpot.

Schematic of how to trim the output voltage. Fixed resistors would also work, they should add to about 10k Ohms.


No heat sink is necessary at ambient temperatures below 30°C. At higher ambient temperatures derate the current or supply a flow of up to 200LFM (linear feet per minute) cooling air is provided (at 100°C ambient). This can be supplied by a 10 cubic feet per minute fan that is about 2.5 inches square. Pentium cooling heat-sink-fans will also do this.

Standard heatsinks are available for half-brick modules such as Wakefield 517-95AB, 527-45AB, 527-24AB, 518-95AB, 528-45AB, 528-24AB, or the less expensive CUI VHS-45 or VHS-95.

Please read this application note:
This DC converter cannot manufacture power, so make sure you have enough 24VAC power to supply the load. The power output is limited to the power that is input to it times the efficiency of 84%. So if you have a supply of 24VAC and 2.5 amps your power is 60 watts (24V*2.5A=60W) So the most we can deliver is 60W/5V * 0.84 efficiency = 10 Amps. Of course you can draw less than 10 Amps, this is the maximum.

If you only have 24VAC*.41A = 10 watts available, you can still use this unit, just don't take more than 10/5 * 0.84 = 1.68 amps out.

Printed circuit board dimensions are 3 x 6.7 inches
NOTE! At maximum power the faceplate temperatures are definitely in the "burn your fingers" category and care should be taken to prevent human contact.

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Low voltage AC to DC converter, 24VAC, 36VAC, 48VAC to 5VDC

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Orem, Utah 84058

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