Can multiple PWM4's use one Power supply?

Modified on Thu, 25 Jan 2024 at 10:11 AM

Natural component tolerances in both the PWM4 and the LED load attached to it, mean every PWM4 will take a slightly different current from the power supply. A signal output Constant voltage power supply can ONLY supply ONE value of voltage and ONE value of current.

Therefore it is very important to ensure the correct specification of both the Constant Voltage Power Supply AND the correct rating for the used wiring. This needs to take into account the current requirements of the PWM4's + any potential losses in the wiring.

Example: Connecting multiple PWM4's to a single power supply:

  • Each PWM4 in the diagram above needs a fixed (constant voltage) supply voltage, but a different supply current (due to the different loads connected).
  • While the largest current is 6A, the constant voltage supply will be required to deliver an absolute minimum current of 12.5A (0.5A + 2A + 4A + 6A), and the wiring must be suitably rated to be able to cope with that too (otherwise there is a potential fire risk if the wiring is underrated).

Always used a true Constant Voltage Power Supply that is specifically designed to be used as power supply (not an LED driver). Using dimmable constant voltage LED drivers (power supplies) is not recommended.

For simplicity, Casambi recommend ONE Constant voltage power supply is used for powering ONE PWM4 only.

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