January 15, 2024

24VAC to 5VDC 5 Amp AC/DC Converter

24VAC to 5V 5A AC/DC low voltage converter

The PST-AC24DC5 is a small 25 Watt switchmode power supply with 24VAC input and 5VDC output. It is useful for powering 5V modems, USB chargers, relays, data loggers, LEDs, video cameras, door bells, wireless and fiber rf transceivers, and sensors from a 24VAC (10VAC to 28VAC) power bus.

24VAC systems are widespread because the low voltage is safe. They are used for door bells, dental offices, security systems, irrigation systems, and CCTV. Adding a 5V device is now simple. The PST-AC24DC5 can also be adjusted to other voltages via a trim pot, as long as the output voltage is lower than the input voltage.

Tiny switchmode 24VAC to 5VDC 5A

	Quantity	1-9	10-49	50-99	100-199	200+
PST-AC24DC5 5V output set at factory		$28.50	$25.90	$23.60	$21.50	$19.10

PST-AC24DC5		Range
Input voltage AC	24VAC nominal	10VAC to 28VAC
Input voltage range	Input voltage must be higher than the output voltage. Input voltage range 8VAC-30VAC (see table below, input must be at least 15.5VAC for 5A output).
Input voltage DC	Also operates on DC input voltage if desired	10VDC to 40VDC
Output voltage	5VDC (Adjustable between 1VDC and 18VDC with 24VAC input)
Output voltage adjustment	Voltage adjustment is through a multi-turn trim pot
Output Current	Depends on the output voltage, see table below, up to 36W
Input Frequency	50Hz, 60Hz, DC	48 Hz to 65 Hz
Voltage Accuracy	±3%	at 0.2A load
Switchmode frequency	150kHZ
Load regulation	<1.2% over the output current range from 0.2 to 1.5A
Protections	Short circuit protect, current limit protection
Operating Temperature	-40°C to +80°C
Storage Temperature	-50°C to +108°C
Thermal Shutdown	135°C internal temperature
Connection	Wire leads, input and output
DC input	When using a direct current input, connect the plus and minus to the input terminals, it doesn't matter which is the plus or minus, since we put a full bridge rectifier on the input, which will sort it correctly.
Isolation	The output is not isolated from the input, the plus and minus output leads must not be electrically connected to either of the AC input wires.
Wire gauge	18 AWG
Weight	2.8 oz., 80 grams
Dimensions	38 x 85 x 23 mm
Warranty	1 year

The following table gives a snapshot of a few voltages and output currents that gives an idea of the capabilities. The converter is designed to use 24VAC input, but can be operated at lower input voltages depending on the output voltage and current:<

Output Voltage	Current	RMS Ripple*	Minimum input voltage	Tested input voltage
1 Volt	4A	7mV	10VAC
2V	7A	9mV	10VAC
3.3V	7A	9mV	10.5VAC
5V	0.8A		8VAC
5V	1.1A		9VAC
5V	1.6A		10VAC
5V	2.5A		11.5VAC
5V	5A		15.5VAC
6V	2A	50mV	10.5VAC
6V	5A		17.5 VAC
8V	2A		12VAC
8V	4A		16VAC
10V	1A		12VAC
10V	2A		15VAC
10V	3A		17VAC
10V	5A		20VAC
12V	1A		14VAC
12V	2A		16VAC
12V	3A	47mV	19VAC	24VAC
14V	3.5A	50mV	22VAC	24VAC
15V	3A			24VAC
16V	3A			24VAC
18V	3A			24VAC

* 50/60Hz ripple will go down as the current goes down, as it is due to the size of the input capacitors.

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