Single-chip mains supply

Single-chip mains supply: Harris’s Type HV-2405E IC, connected with a few external components as shown in the diagram, enables the direct derivation of a regulated 5-24 V d.c. supply from a 100-260 V a.c. mains supply. The peak output current of the device is 500 mA.

The chip contains a pre-regulator that arranges the charging of C. a fairly large capacitance, at the onset of each period of the mains voltage: The charging continues until the potential across the capacitor has reached A level that is roughly the wanted output plus 6 The chip contains a pre-regulator that arranges the charging of C. a fairly large capacitance, at the onset of each period of the mains voltage: The charging continues until the potential across the capacitor has reached A level that i§ roughly the wanted output plus 6 V.

Single-chip mains supply Schematic diagram

Single-chip mains supply Schematic diagram
When that state is reached. C2 provides the voltage necessary for the series regulator also contained in the IC. The output of this regulator can be set between 5 V and 24 V with P1 and is available at pin 6.

WARNING. Since the circuit and its output is connected electrically to the mains, any apparatus connected to the circuit is, therefore, also at mains potential. Great care should thus be ever cised when working- on it: touching certain parts is potentially lethal!

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