Welcome to Cockpitbuilders.com. Please login or sign up.

June 13, 2021, 09:07:14 AM

Login with username, password and session length

PROUDLY ENDORSING


Fly Elise-ng
22 Guests, 0 Users
Members
Stats
  • Total Posts: 57170
  • Total Topics: 7612
  • Online Today: 29
  • Online Ever: 582
  • (January 22, 2020, 08:44:01 AM)
Users Online
Users: 0
Guests: 22
Total: 22

COUNTDOWN TO WF2021


WORLDFLIGHT TEAM USA

Will Depart in...

Recent

Welcome

Backlight dimmer problems

Started by kurt-olsson, May 04, 2021, 01:50:22 AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

kurt-olsson

My first try was to use mosfets to control my 5V backlight.

Almost All mosfets are from 5V and higher voltages. I need 0-5V but cant find any. Also, these units run really hot even with heatsink. And also there is a sagnific voltage drop (~8V gives 5V with D4184 Mosfet).

I can use 12V hardware dimmer i guess but the dimming level will be bad. Almost all dimming the first 5% of knob position and 100% the rest.

I allready have lots of 5V PSU for backlight and if using real aircraft dimmer i need 28V units.


Any tip here? :) i am stuck! Haha

ame

Please post your schematic, and explain how everything is connected. And please state clearly what you are trying to achieve.

I am using a cheap Chinese MOSFET module to dim an LED lighting strip at home. It is 24Vdc at around 30W. The MOSFET is driven by a 3.3V PWM signal. The module barely gets warm.

kurt-olsson

Sorry again for not posting schematic. Its impossible to help without it.

Murphys law!

Either i shortened the first one or bad from the factory.

I tried another one and it worked great!!!

No voltage drop worth mentioning and i pull about 7Amps without heatsink.

I can highly recommend the D4184 right now on initial testing.


Like the Website ?
Support Cockpitbuilders.com and Click Below to Donate