The current drain at the ADJ pin is extremely minimal (as low as 25 ♚) and, therefore, R15 and R16 (the crude and refined voltage manipulations) and R8 form a voltage divider, with 1.25 volts showing up around R8. The function of IC1 is to keep the OUT terminal at 1.25 volts DC over the ADJ terminal. The input to IC1 originates from the output of BR1, which is filtered by C1 and C2 to around + 60 volts DC, and the input for current-sense comparator IC2 develops from bridge rectifier BR2, which furthermore works like a negative bias supply to get regulation to ground level.
The remaining portion of the circuit enables voltage setting and current limiting capabilities. The "HVK" suffix suggests the high-voltage edition of the regulator. The specifications of the layout is centered around IC1, an LM317HVK adjustable regulator, for wide-ranging functionality.
#REPLACE MAC PRO POWER SUPPLY HOW TO#
You Will Also Like: How to Design a Bench Power Supply Circuitįigure 1 above shows the circuit diagram of the laboratory power supply. Voltage Regulation = 0.01% line, and 0.1% load.Coarse control and Fine Control ratio for both current and voltage = 1:10.Number of Supplies = 2 (Fully Floating).
Having said that, because of the DIY layout, you can customize the settings as needed, which can witnessed in the following specification table. The voltage and current ranges are independently variable from 0 to 50 V, and 0 to 5 amps respectively. This post explains a highly regulated, DIY, laboratory grade power supply with dual 0-50 volt.
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