5V Fans on 24V with PWM
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Hello everybody,
Goal: Use of 5V fan and PWM control at the hotend. Since I want to switch everything on and off via PS-ON, I take the detour from the 24V power supply via the step-down controller.
I ask an electronics technician to take a look at the attached circuit diagram to see if it works that way.
Thanks in advance for help
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it looks like it should work, but why not use the jumper to select 5v to the fan headers?
The Duet 2 WiFi and Ethernet boards have three controlled fan connectors FAN0, FAN1 and FAN2 plus two always-on fan connectors. A jumper (V_FAN) allows you to select whether all fans are powered from the VIN supply or from the Duet's 5V supply.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans
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Thank you for your quick reply!
Because I still use a 24v fan (120x120mm) for board cooling (allways-on) and FAN2 for 24V-LED's pwm-controlled.
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... and in addition, all consumers should always be able to be switched off using PS-ON
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Why you don't use the 5V from the PSU ?
The DCDC converter are not usefull -
Right, well, it would work as is.
But you might get away with just 1 step down converter,
or even use the external 5v supplydepending on the current draw/available current.Also adding an fuse at any point is also a good idea.
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@bearer said in 5V Fans on 24V with PWM:
Right, well, it would work as is.
But you might get away with just 1 step down converter, or even use the external 5v supply depending on the current draw/available current.
Also adding an fuse at any point is also a good idea.
OK, 1 stepdown is enough AND adding a fuse
Edit: 1 Fan needs 0,15A, so 1 stepdown is enought (1A without heatsink possible)
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edited version:
so ok?
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with the other requirements then its purrrrrfect!
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@bearer
