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A simple general-purpose desktop power supply used in electronic labs, with power output connector seen at lower-left and power input connector (not shown) located at the rear Interior of high-end linear power supply with toroidal mains transformer. A power supply is an electrical device that supplies electric power to an electrical load.
The output from the regulated power supply may be alternating or unidirectional, but is nearly always DC (direct current). [1] The type of stabilization used may be restricted to ensuring that the output remains within certain limits under various load conditions, or it may also include compensation for variations in its own supply source.
An SMPS designed for AC input can usually be run from a DC supply, because the DC would pass through the rectifier unchanged. [35] If the power supply is designed for 115 VAC and has no voltage selector switch, the required DC voltage would be 163 VDC (115 × √2). This type of use may be harmful to the rectifier stage, however, as it will ...
The 79xx devices have a similar "part number" to "voltage output" scheme, but their outputs are negative voltage, for example 7905 is −5 V and 7912 is −12 V. The 7905 and/or 7912 were popular in many older ATX power supply designs, [4] [5] and some newer ATX power supplies may have a 7912. [6]
Without a heat sink at an ambient temperature at 50 °C, a maximum power dissipation of (T J-T A)/R θJA = ((125-50)/80) = 0.98 W can be permitted. In a constant voltage mode with an input voltage source at V IN at 34 V and a desired output voltage of 5 V, the maximum output current will be P MAX / (V IN-V O) = 0.98 / (34-5) = 32 mA.
Line regulation or input regulation is the degree to which output voltage changes with input (supply) voltage changes—as a ratio of output to input change (for example, "typically 13 mV/V"), or the output voltage change over the entire specified input voltage range (for example, "plus or minus 2% for input voltages between 90 V and 260 V, 50 ...
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