Author Topic: anode voltage and resistor for NHD-C0220AZ-FSW-FTW  (Read 348 times)

ltsmit

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anode voltage and resistor for NHD-C0220AZ-FSW-FTW
« on: March 19, 2019, 06:48:04 PM »
The character display NHD-C0220AZ-FSW-FTW is 5 Volt, but specs says for Backlight Anode: 30 mA @ 3V.

Is the resistor included in de display (so: 3V / 0.030 A = 100 ohm)?

Can the Anode be driven with 5 Volt if a 66.66 ohm resistor is added externally? So, total resistance is then 166.66 ohm (and 166.66 ohm * 0.030 A = 5V), if 100 ohm is included in display.

Thanks.

Ted_M

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Re: anode voltage and resistor for NHD-C0220AZ-FSW-FTW
« Reply #1 on: March 20, 2019, 08:40:59 AM »
Hi Itsmit,

The LED can be driven with a 5V source voltage when a 66.66 ohm resistor is added externally.  This will limit the LED current to 30mA and the LED voltage drop will be 3.0V.

This online LED current limiting Resistor Calculator can be very useful.  http://www.ohmslawcalculator.com/led-resistor-calculator

Best Regards,

 

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