| January 15, 2024 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
75 Watt 5V 15A Output Fully Isolated AC/DC Converter with 24VAC (13VAC-53VAC) input |
 More 24VAC low voltage power options  Smaller 24VAC to 5V converter, 5Amps |
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Run 5 volt equipment in 24VAC environments up to 15Amps |
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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:  Schematic of how to trim the output voltage. Fixed resistors would also work, they should add to about 10k Ohms. Cooling 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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